Geology and Flourspar Deposits of the St. Peters...

Geology and Flourspar Deposits of the

St Peters Dome District Colorado

by

THOMAS A STEVEN

~

f

COLORADO SCIENTIFIC SOCIETY

PROCEEDINGS

VOLUME 15

No6

DENVER COLORADO

1949

i

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CONTENTS Page

Abstract 259 Introduction _________________________________________________________________________________________ -_ 261

Geology __________________________________________________________________________________________________ 262 Pikes Peak granite _____________________________________________________________________ 263 Aplite __________________________________________________________________________________________ 263 Pre-Cambrian lamprophyre ________________________________________________________ 263 PegInatite _________________________________________________________________________________________ 265 Tertiary ( ) lamprophyre ______________________________________________________________ 265

Structural geology ___________________________________________________________________________ _ 266 First group of joints_________________________________________________________________________ _ 268 Second group of joints___________________________________________________________________ _ 268 Third group of 269 Late shear joints and minor faults_______________________________________________ _ 269

Fluorspar deposits ________________________________________________________________________________ _ 271 First period of vein deposition _______________________________________________________ _ 271 Second period of vein deposition_______________________________________________ -shy 271 Origin and age relations_________________________________________________________________ _ 273

Individual deposits ________________________________________________________________________________ _ 276Mattie B Deposit __________________________________________________________________________ _ 278 Duffields deposit _________________________________________________________________________ _ 278 Timberline deposit ______________________________________________________________________ _ 280

Outlook and reserves _________________________________________________________________________________ _ 282

ILLUSTRATIONS Page

Figure 1 Index map showing the location of the St Peters Domedistrict Colorado _______________________________________________________________ 260

2 Geologic map of the St Peters Dome district EI PasoCounty Colorado _______________________________________________________________ 264

3 Structural map of the st Peters Dome district EI PasoCounty Colorado ____________________________________________________________________ 267

4 Geologic map of the Mattie B deposit_____________________________ 275

5 Geologic map of the Duffields deposit______________________________ 277

6 Topographic map of the Timberline deposiL_________________ 279 7 Geologic map of the Timberline tunneL__________________________ 281

8 Geologic map of the surface workings near the northshyern end of the Timberline deposit_______________________________________ 283

- -- ---- ~---l

GEOLOGY AND FLUORSPAR DEPOSITS OF THE ST PETERS DOME DISTRICT COLORADO

by

THOMAS A STEVEN2

ABSTRACT

The St Peters Dome district is in El Paso County Coloshyrado about 8 miles southwest of Colorado Springs Fluoriteshyquartz veins and cryolite-bearing pegmatite dikes are the mineral deposits of the district

The country rock of the St Peters Dome district is the Pikes Peak granite of pre-Cambrian age It is cut by preshyCambrian aplite lamprophyre and cryolite-bearing pegmashytite dikes and by Tertiary () lamprophyre dikes

Most of the district is on an archlike structure in the Pikes Peak granite A belt of massive granite 1200 to 1700 feet wide flanked on both sides by jointed granite trends northeastward across the district Steep joints strike both parallel to and at right angles to the trend of the massive granite and one group of joints dips away from the massive core forming the archlike structure Aplite dikes the oldest dikes in the district and a pre-Cambrian lamprophyre dike occur in steep joints which strike roughly normal to the massive core cryolite-bearing pegmatite dikes occupy joints that make up the arch

A north-trending series of late shear joints and minor faults cuts across all the earlier structures Most of the movement took place along a narrow zone of en echelon fractures that extends the full length of the district Lampshyrophyre dikes of Tertiary (1) age were injected into some of these fissures at an early stage in the shearing and quartz veins formed shortly afterward The fluorite-quartz veins were deposited in fractures after most of the shearing and faulting had occurred Structural and mineralogic relations suggest that these late lamprophyre dikes and fluoriteshyPublished by permission of the Director of the Geoloical Survey United States

Department of the Interior in cooperation WIth the State of Colorado through the Colorado State Geological Survey Board and the Colorado Metal Mining Fund

Geologist U S Geological Survey

l

260 GEOLOGY AND FLUORSPAR DEPOSITS

0

~==o=rRr-OOLORADO

o f 1 0 I

FIGVR~ L-INDEX MAP SHOWING THE LOCATION OF THE st PETERS DOME DISTRICT COLORADO

ST PETERS noM

quartz veins are equivalent in ag dikes and veins in the Cripple C to the west

The fluorite-quartz veins on gold and silver The first fluorsp trict came from the Duffields d 1917 and 1918 the Timberline dE spar Production figures for this 1944 and 1945 mining was resum 16100 tons of mine-run fluofSl Timberline Duffields and Matti

The fluorspar is known tc range of more than 600 feet anI tinuous vertically as well as hI probably exist that do not crop

lNTRODU4

The St Peters Dome distric rado on the eastern slope of mately 8 miles southwest of Cc east of Cripple Creek (fig 1) I Springs by means of the Gold C highway) which follows the 1 rado Springs and Cripple Cre4 the district is between 8000

Cryolite-bearing pegmati1i in the northern part of the dis and Hillebrand1 in 1885 In 19) Peters Dome district had ~ gold The fluorspar deposits Q

first by Aurands in 1920 ~ were prospected originally fC tCrosa Whitman and Hlllebrand W 11

ROcky Mountains U S GeoL SUI1 IFlnlay G I bull U S GeoL SurveyQeoLi

p 15 1916 I Aurand H A Fluorspar depoa1i1 of Q

pp 55-51 1920

l

ST PETERS DOME DISTRICT 261

quartz veins are equivalent in age to similar middle Tertiary dikes and veins in the Cripple Creek district about 15 miles to the west

The fluoritemiddotquartz veins originally were prospected for gold and silver The first fluorspar production from the disshytrict came from the Duffields deposit in 1910 and 1911 In 1917 and 1918 the Timberline deposit was worked for fluorshyspar Production figures for this early work are lacking In 1944 and 1945 mining was resumed in the district and about 16100 tons of mine-run fluorspar was produced from the Timberline Duffields and Mattie B deposits

The fluorspar is known to occur through a vertical range of more than 600 feet and as the deposits are disconshytinuous vertically as well as horizontally fluorspar bodies probably exist that do not crop out

INTRODUCTION

The St Peters Dome district is in El Paso County Coloshyrado on the eastern slope of the Front Range approxishymately 8 miles southwest of Colorado Springs and 15 miles east of Cripple Creek (fig 1) It is accessible from Colorado Springs by means of the Gold Camp road (Corley Mountain highway) which follows the roadbed of the former Coloshyrado Springs and Cripple Creek District Railway Most of the district is between 8000 and 9800 feet above sea level

Cryolite-bearing pegmatite found in numerous dikes in the northern part of the district was described by Cross and Hillebrand1 in 1885 In 1916 Finlay2 noted that the St Peters Dome district had been thoroughly prospected for gold The fluorspar deposits of the district were described first by Aurand3 in 1920 According to Aurand the veins were prospected originally for gold and silver and later

1CJosa~Whitman and Hillebrand W F Contributioll8 to the mineralogy of the tUlcky Mountains U S Geol Survey Bull 20 pp 40middot74 1885

IJtnlay G r U S Geol Survey Geol Atlas Colorado Springs folio (no 203) p 15 1916

Aurand B A Fluorspar deposits of Colorado Colorado GooJ Survey BUll 18 pp 55-57 1920

j


were worked for fluorspar The mineralogy and paragenesis of the pegmatite dikes were discussed briefly by Landes4 in 1935 He suggested that the cryolite pegmatite and the fluorshyspar deposits in the district are related genetically to the surrounding pre-Cambrian Pikes Peak granite The writer disagrees with this conclusion and the present paper dismiddot cusses the age relations and structural control of the pegshymatite dikes and the fluorspar veins

The U S Geological Survey began studies of the fluorshyspar deposits of the St Peters Dome district in 1943 as part of the Strategic Minerals Investigations Preliminary exshyaminations of some of the larger deposits were made in 1943 by D C Cox and J O Fisher and in 1944 by R Dc Trace D M Henderson and DC Cox5 In the spring of 1946 the writer spent approximately 10 weeks studying the areal geology as well as the fluorspar deposits of the district The geologic maps and a brief report were issued in 19486 All the work was done in cooperation with the Colorado State Geological Survey Board and the Colorado Metal Mining Fund

The writer is indebted to Jewell Glass and R E Van Alstine of the U S Geological Survey for microscopic ex~ aminations of severalmiddot thin sections and to the General Chemical Co and Kramer Mines Inc for permission to publish geologic data collected on their properties Dr James Gilluly of the Geology Department University of California at Los Angeles and Ogden Tweto of the U S Geological Survey reviewed the manuscript

GEOLOGY

The country rock of the St Peters Dome district is Pikes Peak granite a pre-Cambrian granite that makes up most of the southern part of the Front Range The granite is

ltLandes K K Colorado pegmatites Am Mineralogist vol 20 pp 322-326 1935 Cox D C The fluorspar deposits of the St Peters Dome district EI Paso County

COlorado (manuscript report in files of U S Geol Survey) 6 pp 1944 Steven T A The fluorspar deposits of the St Peters Dome district E1 Paso

County Colorado U S Geol Survey Strategic Minerals Investigation$Preliminary Report 3-218 1948

ST PETERS DOMJ

cut by dikes of aplite pegmatite Cambrian age and by later pro~ dikes (fig 2) The dikes followJI

Pikes Peak granite-The ] dium- to coarse-grained and pOI up approximately 60 percent oj groundmass and some as phen long On fresh surfaces of grar green but in most of the wea~e Anhedral quartz grains COnstlt granite and biotite and olig~chi 10 percent The accessory mme zircon sphene and allanite7

Aplite-The aplite is rna~4 and quartz which form a mosal( which small biotite crystals are feldspar is mostly microcline Of clase In most of the aplite dikes in some it is relatively coarse-gr ture Small masses of pegmati1 the aplite and constitute as m dikes The aplite which forms Peters Dome district was rna Creek granite Large bodies of ( Pikes Peak granite a few miles and mineralogic similarity of 1 Peak granites suggest that genetically)

Pre-Cambrian lamprophy brian lamprophyre was observ~ district It follows a joint of ~ aplite dikes The lamprophyre lite-bearing pegmatite but bl relatively rare mineral riebe~

j Finlay G I op cit p 4 Finlay G I bull op cit Finlay G I bull op citbull p 4

263 ~FLUORSPAR DEPOSITS

rmiddot The mineralogy and paragenesis Pe discussed briefly by Landes4 in

LOGY

cryolite pegmatite and the fluorshyct are related genetically to the Pikes Peak granite The writer ion and the present paper disshyd structural control of the pegshy

r veins

urvey began studies of the fluorshyrs Dome district in 1943 as part Investigations Preliminary exshygerdeposits were made in 1943 r and in 1944 by R D Trace

Cox1I In the spring of 1946 the y 10 weeks studying the areal

par deposits of the district The report were issued in 19486 All

ration with the Colorado State d the Colorado Metal Mining

to ~rewell Glass and R E Van eal Survey for microscopic exshy sections and to themiddot General Mines Inc for permission to cted on their properties Dr gy Department University of

and Ogden Tweto of the U S themanuscript

e St Peters Dome district is brian granite that makes up

e Front Range The granite is

bull MineralOgist vol 20 pp 322-326 1935 St Peters Dome district EI Paso County

of U S Geol Survey) 6 pp 1944 of the St Peters Dome district E1 Paso Survey Strategic Minerals Investigations

ST PETERS DOME DISTRICT

cut by dikes of aplite pegmatite and lamprophyre of preshyCambrian age and by later probably Tertiary lamprophyre dikes (fig 2) The dikes follow joint systems in the granite

Pikes Peak granite-The Pikes Peak granite is meshydium- to coarse-grained and porphyritic Microcline makes up approximately 60 percent of the granite-some in the groundmass and some as phenocrysts as much as 1 inch long On fresh surfaces of granite the microcline is light green but in most of the weathered granite it is pink or red Anhedral quartz grains constitute 25 to 30 percent of the granite and biotite and oligoclase each make up less t~an 10 percent The accessory minerals are apatite magnetIte zircon sphene and allanite7

Aplite-The aplite is made up essentially of feldspar and quartz which form a mosaic of anhedral grains through which small biotite crystals are irregularly distributed The feldspar is mostly microcline or orthoclase with some oligoshyclase In most of the aplite dikes the rock is fine-grained but in some it is relatively coarse-grained and has a granitic texshyture Small masses of pegmatite are relatively common in the aplite and constitute as much as 40 percent of some dikes The aplite which forms the oldest dikes in the St Peters Dome district was mapped by Finlays as Cripple Creek granite Large bodies of Cripple Creek granite cut the Pikes Peak granite a few miles west of the district Chemical and mineralogic similarity of the Cripple Creek and Pikes Peak granites suggest that they are closely related genetically I

Pre-Cambrian lamprophyre-One dike of pre-Camshybrian lamprophyre was observed in the northern part of the district It follows a joint of the same set followed by the aplite dikes The lamprophyre definitely is cut by the cryoshylite-bearing pegmatite but both these rocks contain the relatively rare mineral riebeckite suggesting that they are

Finlay G I bullbull op cit p 4 Finlay G I bull op cit Finlay G I bull op citbullbull p 4


EXPLANATION

[Mm I Anuviu i IZJ i

Aft lomprophyrt dllt ~

r~J Pik PoGk gro1to

Quortz vein

0 -FluorsPGr-qUGrt win

FGutt

~-~ Rood with tunn1

FLUORSPAR MINES AND PROSPECTS (II Matllo 8

lt (2) Oolorodo hott (3) Lytt opt pit (41 Hu 80 shoft 51 TlmbtllI 11110 workl (6) rli tu1

GeoloOY by T A s FIGURE 2-GEOLOGIC MAP OF THE ST PETERS DOME t-

EL PASO COUNTY COLORADO DISTRICT

ST PETERS DOM

closely related As the pegmati than the aplite the lamprophyn

The pre-Cambrian lamproll rock composed of approximatel~ percent ferromagnesian miner are albite perthitic orthoclase accessory minerals are magneti mineral grains are euhedral aD oriented with their longer axis

Pegmatite-Numerous em matite occur in the northem I district The chief constituents microcline in large subhedral matic bluish-black crystals aD Microcline and quartz make up and riebeckite up to 15 percentl grown with quartz and muchJ ondary minerals No attempt minor minerals for which th~ or to study the internal structu

Riebeckite is a characteris1 granite a rock that cuts the ~ tance northwest of the St p~ the riebeckite pegmatite ocelli Thus the riebeckite- and crY the Mount Rosa granite probal Finlayll suggested

The pegmatite dikes of t1i localized in one of the primal Peak granite but they are ~ dikes and the early lamprop~

Tertiary () lamprophYl () lamprophyre occur alongj

10cr01l~ Whitman and Hillebrand W rj HOck) Mountains U S GeoL 8m

Landes K K bullbull Colorado pegmatltela 4j 11Finlay G I op citbull p 5

FLUORSPAR DEPOSITS

EXPLANATION

J~~r~ 0

-ato lomprcphyrt dill

~ gmatif dike

~ kj

Aplit dill

Pikes Peak i

Quortz vein

r7l ~

FI_spormiddotquartz

Fault

X Mine worklllQl

~ Road itlt tunn

FLUORSPAR MINES ANO PROSPpoundCTS (I) Mot 8 (2) ColltIodo shoft (3) Lot n pit (41 Hugll Bo oItcft (5 I T U urfac bullbullarllng(6) limNnn tvn

(looIQ9Yby TASt1shyTHE st PETERS DOME DISTRiCt COUNT~ COLORADO


closely related As the pegmatite clearly cuts and is later than the aplite the lamprophyre also probably is later

The pre-Cambrian lamprophyre is a fine-grained gray rock composed of approximately 60 percent feldspar and 40 percent ferromagnesian minerals The essential minerals are albite perthitic orthoclase biotite and riebeckite the accessory minerals are magnetite fluorite and sphene The mineral grains are euhedral and in places the feldspars are oriented with their longer axis parallel to the dike walls

Pegmatite-Numerous dikes of cryolite-bearing pegshymatite occur in the northern part of the St Peters Dome district The chief constituents of the pegmatite are pink microcline in large subhedral crystals riebeckite in prisshymatic bluish-black crystals and quartz in anhedral masses Microcline and quartz make up about 85 percent of the rock and riebeckite up to 15 percent Most of the cryolite is intershygrown with quartz and much of it has been altered to secshyondary minerals No attempt was made to identify all the minor minerals for which these dikes are widely knownlQ or to study the internal structure of the dikes

Riebeckite is a characteristic mineral of the Mount Rosa granite a rock that cuts the Pikes Peak granite a short disshytance northwest of the St Peters Dome district a dike of the riebeckite pegmatite occurs in the Mount Rosa granite Thus the riebeckite- and cryolite-bearing pegmatites and the Mount Rosa granite probably are related genetically as Finlayll suggested

The pegmatite dikes of the St Peters Dome district are localized in one of the primary joint systems of the Pikes Peak granite but they are distinctly later than the aplite dikes and the early lamprophyre

Tertiary () lamprophyre-Several dikes of Tertiary () lamprophyre occur along a shear zone in the Pikes Peak

Cross WhItman and mUebrand W F bull Contributions to the mineralogy of the Rocky Mountains U S Oeo Survey BuU 20 pp 40-74 1885

Landes K K Colorado pegmatites Am MIneralogist vol 20 pp 322-326 1935 l1F1nlay O I op citbullbull p 5

e Li

I


granite and are associated with the fluorspar deposits (fig 2) Where unaltered the rock is dense black and porphyshyritic Clusters of biotite crystals and a few phenocrysts of orthoclase are set in a fine-grained panidiomorphic groundshymass composed of biotite grains amphibole needles and orthoclase laths Apatite magnetite and pyrite are accesshysory minerals The ferromagnesian minerals are largely altered to chlorite and iron oxide and as a result most of the dikes have a greenish-gray cast

The Tertiary () lamprophyre is the youngest rock in the St Peters Dome district It is believed to be the correlashytive of the lamprophyre dike rocks in the nearby Cripple Creek district Structural relations of the dikes at Cripple Creek suggest that they are mid-Tertiary in age12

STRUCTURAL GEOLOGY

As flow structures are either absent or indistinct in the Pikes Peak granite of the St Peters Dome district classifishycation of the joints with respect to flOW18 is not practicable However the relative ages of the various fracture systems in the granite are indicated by the age relations of the dikes and veins that occur along them

Most of the St Peters Dome district is on an archlike joint structure in the Pikes Peak granite A belt of massive granite 1200 to 1700 feet wide flanked by jointed granite trends northeastward across the district (fig 3) The first group of joints strikes approximately normal to the belt of massive granite The second group of joints dips away from the massive core forming an archlike structure The joints on the southeastern limb of the arch dip 30-70 SE and those on the gentler northwestern limb dip 10-40 west or south The axis of the arch formed by these joints is near the western edge of the core of massive granite and is about parallel to it The axis appears to plunge gently southwest

l2Loughlin G F and Koschmann A H Geology and ore deposits of the CrippleCreek district Colorado Colorado ScI Soc Proc vol 13 no 6 1935

Balk R Structural behavior of igneous rocks Geol Soc America Mem 5 p 27 1937

ST PETERS DOli

FIGURE 3 - STRUOTURAL MAP O~

EL PASO

267 FLUORSPAR DEPOSITS ST PETERS DOME DISTRICT

nlnnlltTlgt is the youngest rock in It is believed to be the correlashy

dike rocks in the nearby Cripple relations of the dikes at Cripple

mid-Tertiary in age12

either absent or indistinct in the St Peters Dome district classifishy

~CnT to flowls is not practicable of the various fracture systems by the age relations of the dikes

them Dome district is on an archlike Peak granite A belt of massive

wide flanked by jointed granite the district (fig 3) The first

-----~- tely normal to the belt of group of joints dips away from

an archlike structure The joints of the arch dip 30middot-70middot SE and

IhUTIOItIn limb dip 10middot-40middot west or formed by these joints is near of massive granite and is about

to plunge gently southwest

-N----~ and ore depOSits of the CrippleProcbull vol 13 no 6 1935

rocks Geol Soc America Mem 5

EXPLANATlON

B Alluvium

Dillbullbullwing dip

~ Pikes P bullbullk gran

HoNontollinbullbull indicate zone 01 mobullbulllvt jOinted granlt

Quartz vein or fluorapormiddotquorlz vein showinQ dip

19~bull 0

Zone oj thear jointi~ or minor fautlnQ

showilg dip

StTi ed dip of econd trOUP of

JoInts ~o

Strl and dip of fts~o~~U of

G-Iogy bJ 1 A Stbullbullbullbull 1946

FIGURE 3-STRUGTURAL MAP OF THE St PETERS DOME DISTRICT EL PASO COUNT~ COLORADO


The third group of joints strikes approximately parallel to the belt of massive granite A north-trending series of late shear joints and minor faults cuts across all the earlier structures

First group of joints-Steep joints of the first group are the most persistent in the district They are not the most prominent joints but in most outcrops they are distinct and are more uniformly distributed than are the joints of any other group Joints of this set strike nearly normal to the trend of the massive granite and most of them dip between 80middot SW and 80middot NE

The aplite dikes follow these early joints and occur only in the vicinity of the massive granite core

Second group of joints-Joints of the second group are prominent along the flanks of the joint arch They show difshyferent orientations in various localities but the system of joints as a whole displays a fairly well defined pattern On the southeastern flank of the arch the joints strike roughly parallel to the trend of the belt of massive granite Near the massive granite the dips are mostly between 35middot and 45middot SE but farther southeast they increase to as much as 70middot SE A few joints that have the orientation of those on the southeastern flank of the arch are found within the belt of massive granite particularly in the northern part of the district

Joints of the second group on the northwestern flank of the arch are less uniform in attitude than those on the southshyeastern flank On the St Peters Dome ridge these joints strike west to northwest and dip south or southwest at 25degshy35middot Near the road northeast of St Peters Dome these joints as shown by the pegmatite dikes that follow them strike northwest and dip 10-15deg SW Farther north and at a still lower altitude the pegmatite dikes strike north and dip 35degmiddot 45deg W The significance of these local attitudes cannot be evaluated without a knowledge of the regional structure of the Pikes Peak granite

ST PETERS 00

The pegmatite dikes int follow the second group of job arch One pegmatite dike eros near the western edge of the 1 thickest near the axis Sever these joints and a few of the joint arch A few large quam with the Tertiary () lamplO] the second group in the south

Third group of joints- roughly parallel to the nortb granite These joints can be area mapped but they are plltl most abundant along the rid St Peters Dome where the3 control Joints of this group a the belt of massive grante b weak In the southeastern pa are weak

Most of the joints of this dips range widely Northwesl ticularly in the vicinity of S uniformly 80deg NW within tl dip ranges from vertical to 7~ part of the district most of ~

Joints of the third grouJ veins and it is believed that ~ first ~nd second groups of i1

Late shear joints and 1 shear joints and minor fa~ structures Most of the fract along a J)arrow north-tren~ that extends the fulllengtbJ fracturing is flanked by weaker fractures particu parts of the district Most1

FLUORSPAR DEPOSITS

strikes approximately parallel to A north-trending series of late

faults cuts across all the earlier

joints of the first group are distrICt They are not the most

most outcrops they are distinct and than are the joints of any

set strike nearly normal to the and most of them dip between

these early joints and occur only granite core

~J-oints of the second group are of the joint arch They show difshy

lIUlous localities but the system of a fairly well defined pattern On

the arch the joints strike roughly belt of massive granite Near the

are mostly between 35deg and 45middot they increase to as much as 70deg the orientation of those on the

arch are found within the belt of in the northern part of the

on the northwestern flank of attitude than those on the southshyPeters Dome ridge these jOints

dip south or southwest at 25middotshyof St Peters Dome these joints dikes that follow them strik~

middotSW Farther north and at a still dikes strike north and dip 35middotshy

these local attitudes cannot be of the regional structure of


The pegmatite dikes in the St Peters Dome district follow the second group of joints on both flanks of the joint arch One pegmatite dike crosses the axis of the joint arch near the western edge of the belt of massive granite and is thickest near the ax~ Several minor aplite dikes follow these joints and a few of them cross over the axis of the joint arch A few large quartz veins of the type associated with the Tertiary () lamprophyre dikes occur in joints of the second group in the southeastern part of the district

Third group of joints-The third group of joints is roughly parallel to the northeast-trending belt of massive granite These joints can be recognized over much of the area mapped but they are prominent only locally They are most abundant along the ridge extending southwest from St Peters Dome where they form the main topographic control Joints of this group are the strongest found within the belt of massive gra~ite but even so they are relatively weak In the southeastern part of the district these joints are weak

Most of the joints of this group strike N 40-75 E The dips range widely Northwest of the massive granite parshyticularly in the vicinity of St Peters Dome the joints dip uniformly 80 NW within the belt of massive granite the dip ranges from vertical to 70 SE and in the southeastern part of the district most of these joints dip 50-75 0 NW

Joints of the third group are not followed by dikes or veins and it is believed that they are of later origin than the first and second groups of jOints

Late shear joints and minor faults-A series of late shear joints and minor faults cuts across all the earlier structures Most of the fracturing and movement took place along a ~arrow north-trending zone of en echelon fractures that extends the full length of the district The main zone of fracturing is flanked by discontinuous parallel belts of weaker fractures particularly in the central and southern parts of the district Most of the shear joints and minor

GEOLOGY AND FLUORSPAR DEPOSITS 270

faults strike between N 20middot W and N 20middot E A few of the joints and faults dip steeply east but most of them dip from vertical to 50 0 W

The main zone of fracturing contains a number of en echelon fissure zones which step progressively eastward from south to north Joints formed at an early stage in the late period of shearing are particularly prominent in the northern part of the district Lamprophyre dikes were inshyjected into some of these joints and quartz veins later formed along others Joints and minor faults in the central and southern parts of the district formed somewhat later than those in the northern part and are stronger and more prominent The fluorite-quartz veins filling some of these fractures were formed after most of the shearing and faultshying had occurred The fluorite in the weak fracture zones flanking the main shear zone is scattered and unimportant

The early pre-lamprophyre shearing was relatively weak and the amount of movement along the fractures was small The second stage of shearing was more intense and the fractures are marked by considerable gouge and granushylated granite Movement during the second period of shearshying was largely restricted to the area between the northern end of the Mattie B deposit and the southern end of the Timberline deposit

As the faults are in uniform Pikes Peak granite it is difficult to determine the direction or amount of displaceshyment along most of them However a few of the faults cut and displace aplite dikes and show normal fault movement Although striations on the fault surfaces range widely in orientation many of them pitch 60 0 _75 0 S The steeplyshydipping aplite dike near the Duffields deposit (fig 5) is offshyset to the south on the western hanging-wall side of the fault indicating movement of the type suggested by striations

ST pETERS DOl

FLUORSPAR~

Two periods of vein dep(l St Peters Dome district These phases of each of the two stagl ing Mineralization was stronl strongest

First period of vein d~ trending zone of late fractu~ period of deposition and ~e ~ about the same areal distrlbu~ The early quartz veins are mas area between the Mattie B de where they folloW en echelon of them occur as single veinsl

occur more characteristically veinS Many of the larger vein fragments of granite but the lated rock In the area north 01 similar but not so abundant

The earliest veins consiSi finely granular t~ chal~edonic ~ to finegrained dlSsemmatedcl rich quartz is brecciated and rE less chloritic quartz The quar eral is less chloritic and ligh1 smaller veins

In the southeastern part veins follow the second grou gray reddish-brown and ver finel~ granular quartz ChIori Many of the early quart Shearing and small veins we] the second period of vein dept

Second period of vein d of vein deposition closely folIc of late (Tertiary) shearing

I AND FLUORSPAR DEPOSITS

IN 20middot W and N 20middot E A few of the rePly east but most of them dip from

~ fra~turing contains a number of en ~hIch step progressively eastward

omts formed at an early stage in the ~e particularly prominent in the

tnct Lamprophyre dikes were inshy~se joints and quartz veins later

omts and minor faults in the central the district formed somewhat later ern part and are stronger and more -quartz veins filling some of these

after most of the shearing and faultshyfluorite in the weak fracture zones zone is scattered and unimportant prophyre shearing was relatively movement along the fractures was of shearing was more intense and byconsiderable gouge and ganushy

dunng the second period of shearshyto the area between the northern

posit and the southern end of the

uniform Pikes Peak granite it is e direction or amount of dis~laceshy However a few of the faults cut and show normal fault movement e fa~lt surfaces range widely in m pItch 60middot-75middot Smiddot The steeplyshye Duffields deposit (fig 5) is offshystern hanging-wall side of the

ent of the type suggested by


FLUORSPAR DEPOSITS

Two periods of vein deposition are recognized in the St Peters Dome district These are correlated with the late phases of each of the two stages of late (Tertiary) shearshying Mineralization was strongest where the fracturing is strongest

First period of vein deposition-In the main northshytrending zone of late fractures the quartz veins of the first period of deposition andmiddot the late lamprophyre dikes have about the same areal distribution and are similar in attitude The early quartz veins are most abundant and largest in the area between the Mattie B deposit and the Colorado shaft where they follow en echelon zones of shear joints A few of them occur as single veins but the early quartz veins occur more characteristically in networks of interlacing veins Many of the larger veins contain angular chloritized fragments of granite but the vein walls show little granushylated rock In the area north of the Mattie B the veins are similar but not so abundant

The earliest veins consist almost entirely of green finely granular to chalcedonic quartz The green color is due to finegrained disseminated chlorite In places the chloriteshyrich quartz is brecciated and recemented with lighter green less chloritic quartz The quartz in the larger veins in genshyeral is less chloritic and lighter in color than that in the smaller veins

In the southeastern part of the district several early veins follow the second group of joints They are filled by gray reddish-brown and very light green chalcedony and finely granular quartz Chlorite is absent

Many of the early quartz veins were broken by later shearing and small veins were formed within them during the second period of vein deposition

Second period of vein deposition-The second period of vein deposition closely followed the second stronger stage of late (Tertiary) shearing and faulting Lenticular fluorshy


ite-quartz veins occur in the more prominent en echelon fractures along the main zone of shearing and the larger deposits appear to be restricted to that part of the zone between the northern end of the Mattie B d~posit and the southern end of the Timberline deposit In the Timberline deposit movement along the shear zone was distributed along many closely spaced fractures and the veins are narshyrow and overlap Farther north the en echelon faults are more widely spaced and there was relatively greater moveshyment and brecciation on the individual fractures The veins in these fissures tend to be larger and less closely associated than the veins farther south

Gouge and granulated granite are cut by veins and in places are partly replaced by quartz and fluorite indicating that most of the movement on the faults preceded the minshyeralization Movement recurred during vein deposition however as shown by repeated brecciation of the veins and by the variation in the mineral composition of the veins As there was a well-defined sequence of deposition of the various minerals the minerals of the individual stages were deposited in whatever fractures were open at the time Thus

~ many of the veins do not contain all of the mineral assemshyblages represented in the district

I The granite along the late (Tertiary) fracture zones was silicified early in the second period of mineralization Not only are the walls of the veins silicified but granite breccia fragments enclosed by later vein material are silicishyfied markedly

Most of the fluorite in the district was deposited in the first stage of the second period of vein deposition The fluorshyite occurs in veins and as a filling in irregular bodies of breccia It is moderately to coarsely crystalline and is purple green and white Most of the fluorite is intergrown with quartz but the amount of quartz ranges widely Sevshyeral generations of fluorite are evident and much of the early fluorite is brecciated and cemented with later fluorite

ST PETERS DOl

The fluorite stage of the deposl eralogy of the succeed~g stag~

Finely granular white qua1 second stage of deposition anell material in the fluorspar de~ late in the second stage of depi tributed but in small quantitiel they constitute as much as a fa rial Galena and sphalerite are 1 spread of the sulfide ~e11 chalcopyrite was found m ~ quantities of gold and silyer 8l but as no detailed chenucal ltI made of the ores the mode 01 silver is not known Possibly sulfides A little green fluorite phases of the quartz-sulfide stl

Pink barite is locally abUJ1 it was the only mineral de~ bladed crystals although in ot] of the barite appears to havi quartz-sulfide stage but possi~ in the succeeding coarse-qualJ

In the third and last Bt1 ~latively coarsely crystalline ~area Comb structure is i ietS and drusy cavities are CO tli6only representative of the trOll in the southeastern pari contain a little specularite ~

Origin and age relatiltnr~ St Jraquoeters Dome district ~c nuneral deposits The assocU aomc quartz the complex] nature of the veinS and tb tppical of deposits formed uq temperature and pressure I

AND FLUORSPAR DEPOSITS

in the more prominent en echelon zone of shearing and the larger

restricted to that part of the zone of the Mattie B deposit and the

liI11berlirle

recurred

deposit In the Timberline the shear zone was distributed fractures and the veins are narshynorth the en echelon faults are

there was relatively greater moveshythe individual fractures The veins

be larger and less closely associated

granite are cut by veins and in by quartz and fluorite indicating

on the faults preceded the minshyduring vein deposition

belgteamiddotted

district

brecciation of the veins and mineral composition of the veins

1Iuo- sequence of deposition of the of the individual stages were

+ were open at the time Thus contain all of the mineral assemshy

late (Tertiary) fracture zones second period of mineralization

of the veins silicified but granite by later vein material are silicishy

in the district was deposited in the 1J)E~ri(1d of vein depOSition The fluorshy

to as a filling in irregular bodies of

coarsely crystalline and is Most of the fluorite is intergrown

of quartz ranges widely Sevshyare evident and much of the

and cemented with later fluorite

ST PETERS DO~E DISTRICT 273

The fluorite stage of the deposition is distinctive the minshyeralogy of the succeed~g stage is markedly different

Finely granular white quartz is the chief product of the second stage of deposition and is the most common gangue material in the fluorspar deposits Sulfides were deposited late in the second stage of deposition They are widely disshytributed but in small quantities and only in a few veins do they constitute as much as a few percent of the vein mateshyrial Galena and sphalerite are the most abundant and wideshyspread of the sulfide minerals A trace of pyrite and chalcopyrite was found in the Timberline tunnel Small quantities of gold and silver are also found in these veins but as no detailed chemical or petrographic studies were made of the ores the mode of occurrence of the gold and silver is not known Possibly they are associated with the sulfides A little green fluorite was deposited in the closing phases of the quartz-sulfide stage

Pink barite is locally abundant and in two minor veins it was the only mineral deposited It is common in long bladed crystals although in other places it is granular Most of the barite appears to have been deposited late in the quartz-sulfide stage but possibly a little was deposited early in the succeeding coarse-quartz stage

In the third and last stage of deposition veinlets of relatively coarsely crystalline quartz were deposited over a wide area Comb structure is well formed in these late veinshylets and drusy cavities are common Quartz of this stage is the only representative of the second period of vein deposishytion in the southeastern part of the district These veins contain a little specularite particularly in the drusy cavities

Origin and age relations-The fluorspar deposits of the St Peters Dome district belong to the epithermal class of mineral deposits The associated finely granular to chalceshydonic quartz the complexly branching and brecciated nature of the veins and the mineral assemblage all are typical of deposits formed under conditions of relatively low temperature and pressure


The mineral deposits in the St Peters Dome district have many features in common with the gold deposits in the Cripple Creek district14 about 15 miles to the west although the mineralogy of the deposits in the Cripple Creek district is much more complex than that of the St Peters Dome disshytrict The deposits in both districts are of the epithermal type and in both they are associated with alkali-rich basic dikes Following is a comparison of the mineralogy and paragenesis of the two districts

St Peters Dome District Cripple Creek Districtlli

First period of vein deposition

Deposition of finely granular to chalcedonic chlorite-bearing quartz veins

Second period of vein deposition

- STAGE 1shy

Siliciflcation of granite Deposishy Corrosion of granite and deposhytion of f1uorite-quartz veins sition of quartz and adularia

Deposition of quartz-fluoriteveins

- STAGE II-

Deposition of finely granular Deposition of quartz fluorite quartz small quantities of pyrite dolomite or ankerite fluorite sphalerite galena celestite galena sphalerite pyrite chalcopyrite and barshy tetrahedrite gold and silver ite in cracks and as breccia tellurides roscoelite and barshyfIllings ite These minerals occur

mostly in narrow cracks and vugs

STAGE III-

Deposition of drusy quartz Deposition of drusy quartzbarite () and specularite chalcedony pyrite calcite

cinnabar and very minor quantities of fluorite

Loughlin G F and Koschmann A R Geology and ore deposIts of the CrippleCreek dtstrict Colorado Colorado Sci Soc Proc vol 13 no 6 1935

OLoughlin G F and Koschmann A R op cit pp 293-297

ST PETERS DOl

FIGURE 4-GEOLOGIC MAl

lt

o 40 110~~~I~--~----~----~I

C)ontour lmrva 10 Ft DrJfum $ flpprDXHmtt

(IOIotY and T0POtrOPhy by


districts

in the St Peters Dome district common with the gold deposits in the about 15 miles to the west although

deposits in the Cripple Creek district than that of the St Peters Dome disshyboth districts are of the epithermal are associated with alkali-rich basic comparison of the mineralogy and

Cripple Creek Districtlll

Co~rgtsion of granite and deposhysItIon of Quartz and adularia Deposition of Quartz-fluorite veins

Deposition of quartz fluorite pyrite dolonute or ankerite celestite galena sphaleritetetrahedrite gold and silver tellurides roscoelite and barshyite These minerals Occur mostly in narrow cracks and vugs

STAGE III-

Deposition of drusy Quartz chalcedony pyrite calcite cinnabar and very minor QUantities of fluorite

Geology and ore deposits of the CrippleSct Soc Procbull vol 13 no 6 1935

A If op citbull PP 293-297


EXPLANATION _

Lot ~PhY It

dI bull

~ iPi Peak frOoita ~

~ 0shy

~ Ftvorsparq-n tin

lllawio dip Oashd wlltre inftrrtbullbull dOt tedwher--bullbullbull

IZl Quartz bullbull10

~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V

1 A Sbullbullbull 1946

FIGURE 4-GEOLOGIC MAP OF THE MATrlE 8 DEPOSIT


The lenticular en echelon arrangement of the veins in the St Peters Dome district also is characteristic of many of the veins in the Cripple Creek district16

The fluorspar deposits of the St Peters Dome district like the gold deposits of the Cripple Creek district are conshysidered to be of Miocene age The volcanic rocks and bedded sediments in the Cripple Creek caldera which are older than the mineral deposits are younger than the Florissant lake beds to the northP The age of the Florissant lake beds formerly was considered to be late Miocene but in 1935 Gazin18 presented evidence favoring a late Oligocene or early Miocene age for these beds As the rocks and ore deposits of the Cripple Creek caldera are clearly younger than the Florissant lake beds they are considered to be of Miocene age19 From the close mineralogic and structural similarity of the St Peters Dome deposits to the Cripple Creek deposits it is considered probable that the fluorspar deposits in the St Peters Dome district also are of Miocene age

INDIVIDUAL DEPOSITS

The first fluorspar mined in the st Peters Dome district came from the Hughes Boss claim on the southern end of the Duffields deposit The claim was worked during 1910 and 1911 and a small quantity of hand-sorted fluorspar was shipped In 1917 and 1918 the Timberline deposit or the Cather Springs deposit as it was then known was worked for fluorspar Production figures for the early mining are lacking but the Cather Springs deposit is reported to have produced 90 carloads of fluorspar The district was inactive from 1918 until World War II In 1944 mining was resumed in the district by Kramer Mines Inc Approximately 16100 tons of ore were treated in the companys mill at Colorado

OLoughlin G F and Koschmann A R bull op cit pp 276 and 297 l1oughlin G F bullbull and Koschmann A R op cit pp 236-239

lSGazin G L A marsupial from the Florissant beds (Tertiary) of Colorado Jour Paleontology vol 9 P 57 1935

1ampJ0Koschmann A R bull personal communication

ST pETERS DOME

FIGURE 5-GEOLOGIC MAP OFI

echelon arrangement of the veins in district also is characteristic of many

Flfple Creek districtI6

kvllsitlt of the St Peters Dome district of the Cripple Creek district are conshy

age The volcanic rocks and bedded Creek caldera which are older are younger than the Florissant

The age of the Florissant lake beds to be late Miocene but in 1935

favoring a late Oligocene or these beds As the rocks and ore Creek caldera are clearly younger beds they are considered to be of close mineralogic and structural

Dome deposits to the Cripple probable that the fluorspar

Dome district also are of Miocene

fJ)IVlEUAL DEPOSITS

mined in the St Peters Dome district Boss claim on the southern end of

claim was worked during 1910 of hand-sorted fluorspar was

1918 the Timberline deposit or the as it was then known was worked

figures for the early mining are Springs deposit is reported to have fluorspar The district was inactive

II In 1944 mining was resumed Mines Inc ApprOXimately 16100

in the companys mill at Colorado

A Hbullbull op cit PP 276 and 297 A H op cit pp 236-239

Florissant beds (Tertiary) of Colorado Jour


FIGURE 5-GEOLOGIC MAP OF THE DUFFIELDS DEPOSIT

EXPLANATION

Aplit

~ PlktlPlOk

Iij Fluarlpor qucrfz vm howlng dip dotted whre conceald

~ erROloted oronlt

flUON~~1 vein (Ootted Wlltrl lt_lOltd)

I~I Quartz or

fluorspor - qUOltr tillltil

-- Fbullbull1t

(Dotaed wart dotted whtrt

II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------

Contour itvol 10 ftlt IkJhIttt is 11rl1i_hI _If 8H TNt

Glology and Topogrophy by VI Steven 1946


Springs before operations were stopped in 1945 Of this total approximately 7000 tons of ore came from the Leyte open cut 8500 tons from the Timberline deposit and 600 tons from the Mattie B deposit Minor values in lead zinc silver and gold were recovered in milling the fluorspar ore

Mattie B deposit-The Mattie B deposit (fig 4) is the northernmost of the fluorspar deposits It is localized at a bend in the controlling fault South of the bend the hanging wall of the vein strikes N 10deg E and dips about 45deg W At the bend the strike of the vein turns sharply to N 50middot E and the dip is about 45deg NW The vein is exposed in a bullshydozer cut for a length of about 120 feet and it probably does not extend far beyond the last exposures The average thickshyness of the exposed vein is about 4 feet the maximum thickshyness is 5 feet measured near the bend in the vein

The mam vein consists chiefly of brecciated fluorite cemented by abundant granular quartz The highest grade ore is concentrated adjacent to the gouge and granulated granite on the hanging wall Toward the footwall of the vein gTanite fragments are progressively more abundant and beyond the limit of ore only scattered veins cut the shattered granite Many small veins up to 2 inches in width parallel the main vein in the gouge and granulated granite of the hanging wall Second stage quartz was not deposited in these small veins which are higher grade than the main vein

Most of the production from the Mattie B deposit came from a shallow open cut on the vein

Duffields deposit-The Duffields deposit (fig 5) was named for a nearby siding on the old Colorado Springs and Cripple Creek District Railway The workings on the deshyposit are the Leyte open pit just north of the Gold Camp road and the Hughes Boss shafts 110 and 150 feet south of the road Most of the production from the deposit came from the Leyte pit in 1944 and 1945

ST PETERS 00

middotFJGURE 6-TOPOGRAPHIC tti

279

_ll~t1nln


were stopped in 1945 Of this 7000 tons of ore came from the Leyte from the Timberline deposit and 600 B deposit Minor values in lead zinc recovered in milling the fluorspar ore

The Mattie B deposit (fig 4) is the fluorspar deposits It is localized at a

fault South of the bend the hanging N 10middot E and dips about 45middot W At

of the vein turns sharply to N 50middot E 45middot NW The vein is exposed in a bullshyof about 120 feet and it probably does the last exposures The average thickshy

is about 4 feet the maximum thickshynear the bend in the vein

consists chiefly of brecciated fluorite granular quartz The highest grade

aalaCtent to the gouge and granulated wall Toward the footwall of the are progressively more abundant

of ore only scattered veins cut the small veins up to 2 inches in width

in the gouge and granulated granite tSECOIld stage quartz was not deposited IWOlen are higher grade than the main

IUction from the Mattie B deposit came on the vein

Duffields deposit (fig 5) was on the old Colorado Springs and

Railway The workings on the deshypit just north of the Gold Camp shafts 110 and 150 feet south of

ImOOtlctlon from the deposit came from


Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe

~~- Open cut wit dump

Trail

200 400 600 Ft degL--~c~on~t~~r~in~=r=O~I~Ohhe~t--~1

i DPprDxlmo1t1 lMon 1(10 Iflve

Topogrophy by ROTroc bullbull OCoo end D1dn 1944 T A steen 1946

F~GURE 6-TOPOGRAPHIC MAP OF THE TIMBERLINE DEPOSIT


The deposit has been exposed at one time or another during mining operations for about 400 feet along the strike Although neither end of the deposit has been exshyposed no evidence that it extends very far beyond the mine workings has been found The vein is at least 15 feet thick for more than 200 feet along the strike and just south of the Gold Camp road it is about 20 feet thick

The Duffields deposit is localized in the shattered rock in the pronounced bend along the controlling fault In the Hughes Boss shafts the hanging wall of the vein strikes N 20deg E and dips 65deg W Just south of the road the strikefl

i changes and in the Leyte pit the hanging wall of the vein i strikes north and dips 70deg W The vein is thickest where the

strike of the fault changes The highest grade fluorspar is located near the hanging

wall of the vein and the adjacent gouge is partly replaced As in the Mattie B deposit granite fragments are increasshyingly abundant toward the footwall where only irregular veinlets cut the fractured granite The granite of the footshywall commonly is silicified beyond the limit of fluorspar deposition

The vein at the Duffields deposit consists largely of fluorite and quartz of the first stage of the second period of vein deposition Variable quantities of finely granular white quartz and associated galena and sphalerite occur as a breccia filling Some barite was seen on the dump of the Leyte pit but none was found in place

Timberline deposit-The Timberline deposit (fig 6) occurs near the southern end of the mineralized zone in the St Peters Dome district It consists of overlapping lenticular veins that crop out for a distance of 1500 feet Mine workshyings include a tunnel (fig 7) driven northward from the southern end of the deposit and some surface workings (fig 8) that are 600 to 1000 feet north of the tunnel portal Numerous prospect pits have been dug along the length of

FIGURE 7-GEOLOGIO MAPthe deposit Most of the production in 1917 and 1918 came

~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~

Fluorpormiddotquorh yentinbull bull howi dip

(dod wh infomdl

1m Brcclotd tfonit

wIIh moy Eltvotloll approlmottly ftuorlpar-quortt vlin

8636 fat

v I Quartz or

fluoropar-quo_veinlt

o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I

Dafvlm 1 (lppt()xllft(JIw tm (1 Mv GoololtlY by 1 A Sto 1946v

FIGURE 7-GEOLOGIC MAP OF THE TIMBERLINE TUNNEL

i ~(


from the Timberline tunnel in 1944 and 1945 the open cuts supplied most of the production although the Timberline tunnel also was worked

The veins of the Timberline deposit are in subparallel fractures of narrow shear zone Displacement on faults in this zone appears to be small and the gouge is rarely more than an inch or two thick The veins are exposed through a vertical range of 380 feet and appear to be as discontinuous vertically as they are along the strike The individual veins are as much as 7 feet thick and 200 feet long Locally as in the Timberline tunnel brecciated zones between subparallel fissures are mineralized

The tenor of the ore varies considerably The fluoriteshyquartz veins that formed largely during the first stage of the second period of vein formation tend to be of higher grade but narrower than the more siliceous veins formed by reshypeated brecciation and deposition Galena and sphalerite are more abundant in the Timberline deposit than in the other deposits and pyrite and chalcopyrite were observed only in the Timberline tunnel Small quantities of barite are distributed widely

OUTLOOK AND RESERVES

The discovery of new deposits of fluorspar in the St Peters Dome district probably will depend upon exploration at depth within the area of known deposits Detailed mapshyping north of the Mattie B deposit and reconnaissance south of the Timberline deposit did not disclose significant fracturing related to the second stage of Tertiary () shearshying and the fluorspar deposits in these areas are unimporshytant The fluorspar deposits are known to occur through a vertical range of more than 600 feet and as the deposits are discontinuous vertically as well as horizontally fluorspar bodies probably exist that do not crop out

Very little ore in the district can be classed as measured or blocked out However exposures at the three main deshy

posits are considered to indicate at least 65000 tons of ore

FIGURE a-GEOLOGIC MAl THE NORM

-----~

283ST PETERS DOME DISTRICT

i--___4p____

oontour

FfUOfpor-qugrf vein ihowln dipDohtd whero nfed dottod wher conclol

o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO

Geology ond toPltlorophJ bJ lA St 1946

FIGURE 8- GEOLOGIC MAP OF THE SURFACE WORKINGS NEAR THE NORTHERN END OF THE TIMBERLINE DEPOSIT

-


containing 35 percent or more CaF2 within 100 feet beneath the present workings Another 80000 tons of comparable ore reasonably can be inferred These estimates are conshyservative as they take into account no ore deeper than 250 feet beneath the surface at the Timberline deposit 200 feet beneath the surface at the Duffields deposit or 50 feet beshyneath the surface at the Mattie B deposit

i

COLORADO SCIENTIFIC SOCIETY I A H KOSCHMAN President OGDEN TwETO Secretary VV ~TRAVERTreasurer I

I ~ail exchanges to Colorado Scientific Society I

Denver Public Library Denver Colorado I

lAddress communications to COLORADO SCIENTIFIC SOCIETY

214 New Custom House Denver 2 Colorado I

r iAdditional copies of this paper cost 751 Subscription price per volume $1000

I

CONTENTS Page







ILLUSTRATIONS Page








- -- ---- ~---l


by

THOMAS A STEVEN2

ABSTRACT







l


0

~==o=rRr-OOLORADO

o f 1 0 I


ST PETERS noM




lNTRODU4






pp 55-51 1920

l





INTRODUCTION






j





GEOLOGY





ST PETERS DOMJ








LOGY


r veins


















EXPLANATION



r~J Pik PoGk gro1to

Quortz vein


FGutt

~-~ Rood with tunn1





ST PETERS DOM









FLUORSPAR DEPOSITS

EXPLANATION

J~~r~ 0


~ gmatif dike

~ kj

Aplit dill

Pikes Peak i

Quortz vein

r7l ~

FI_spormiddotquartz

Fault

X Mine worklllQl

~ Road itlt tunn












e Li

I




STRUCTURAL GEOLOGY





ST PETERS DOli


EL PASO















EXPLANATlON

B Alluvium





19~bull 0


showilg dip


JoInts ~o










ST PETERS 00






FLUORSPAR DEPOSITS



























ST pETERS DOl

FLUORSPAR~



















FLUORSPAR DEPOSITS













ST PETERS DOl









liI11berlirle

recurred






belgteamiddotted

district























- STAGE 1shy



- STAGE II-



STAGE III-





ST PETERS DOl


lt

o 40 110~~~I~--~----~----~I




districts






STAGE III-





EXPLANATION _

Lot ~PhY It

dI bull


~ 0shy

~ Ftvorsparq-n tin



~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-



CONTENTS Page







ILLUSTRATIONS Page








- -- ---- ~---l


by

THOMAS A STEVEN2

ABSTRACT







l


0

~==o=rRr-OOLORADO

o f 1 0 I


ST PETERS noM




lNTRODU4






pp 55-51 1920

l





INTRODUCTION






j





GEOLOGY





ST PETERS DOMJ








LOGY


r veins


















EXPLANATION



r~J Pik PoGk gro1to

Quortz vein


FGutt

~-~ Rood with tunn1





ST PETERS DOM









FLUORSPAR DEPOSITS

EXPLANATION

J~~r~ 0


~ gmatif dike

~ kj

Aplit dill

Pikes Peak i

Quortz vein

r7l ~

FI_spormiddotquartz

Fault

X Mine worklllQl

~ Road itlt tunn












e Li

I




STRUCTURAL GEOLOGY





ST PETERS DOli


EL PASO















EXPLANATlON

B Alluvium





19~bull 0


showilg dip


JoInts ~o










ST PETERS 00






FLUORSPAR DEPOSITS



























ST pETERS DOl

FLUORSPAR~



















FLUORSPAR DEPOSITS













ST PETERS DOl









liI11berlirle

recurred






belgteamiddotted

district























- STAGE 1shy



- STAGE II-



STAGE III-





ST PETERS DOl


lt

o 40 110~~~I~--~----~----~I




districts






STAGE III-





EXPLANATION _

Lot ~PhY It

dI bull


~ 0shy

~ Ftvorsparq-n tin



~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-



- -- ---- ~---l


by

THOMAS A STEVEN2

ABSTRACT







l


0

~==o=rRr-OOLORADO

o f 1 0 I


ST PETERS noM




lNTRODU4






pp 55-51 1920

l





INTRODUCTION






j





GEOLOGY





ST PETERS DOMJ








LOGY


r veins


















EXPLANATION



r~J Pik PoGk gro1to

Quortz vein


FGutt

~-~ Rood with tunn1





ST PETERS DOM









FLUORSPAR DEPOSITS

EXPLANATION

J~~r~ 0


~ gmatif dike

~ kj

Aplit dill

Pikes Peak i

Quortz vein

r7l ~

FI_spormiddotquartz

Fault

X Mine worklllQl

~ Road itlt tunn












e Li

I




STRUCTURAL GEOLOGY





ST PETERS DOli


EL PASO















EXPLANATlON

B Alluvium





19~bull 0


showilg dip


JoInts ~o










ST PETERS 00






FLUORSPAR DEPOSITS



























ST pETERS DOl

FLUORSPAR~



















FLUORSPAR DEPOSITS













ST PETERS DOl









liI11berlirle

recurred






belgteamiddotted

district























- STAGE 1shy



- STAGE II-



STAGE III-





ST PETERS DOl


lt

o 40 110~~~I~--~----~----~I




districts






STAGE III-





EXPLANATION _

Lot ~PhY It

dI bull


~ 0shy

~ Ftvorsparq-n tin



~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-



l


0

~==o=rRr-OOLORADO

o f 1 0 I


ST PETERS noM




lNTRODU4






pp 55-51 1920

l





INTRODUCTION






j





GEOLOGY





ST PETERS DOMJ








LOGY


r veins


















EXPLANATION



r~J Pik PoGk gro1to

Quortz vein


FGutt

~-~ Rood with tunn1





ST PETERS DOM









FLUORSPAR DEPOSITS

EXPLANATION

J~~r~ 0


~ gmatif dike

~ kj

Aplit dill

Pikes Peak i

Quortz vein

r7l ~

FI_spormiddotquartz

Fault

X Mine worklllQl

~ Road itlt tunn












e Li

I




STRUCTURAL GEOLOGY





ST PETERS DOli


EL PASO















EXPLANATlON

B Alluvium





19~bull 0


showilg dip


JoInts ~o










ST PETERS 00






FLUORSPAR DEPOSITS



























ST pETERS DOl

FLUORSPAR~



















FLUORSPAR DEPOSITS













ST PETERS DOl









liI11berlirle

recurred






belgteamiddotted

district























- STAGE 1shy



- STAGE II-



STAGE III-





ST PETERS DOl


lt

o 40 110~~~I~--~----~----~I




districts






STAGE III-





EXPLANATION _

Lot ~PhY It

dI bull


~ 0shy

~ Ftvorsparq-n tin



~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-



l





INTRODUCTION






j





GEOLOGY





ST PETERS DOMJ








LOGY


r veins


















EXPLANATION



r~J Pik PoGk gro1to

Quortz vein


FGutt

~-~ Rood with tunn1





ST PETERS DOM









FLUORSPAR DEPOSITS

EXPLANATION

J~~r~ 0


~ gmatif dike

~ kj

Aplit dill

Pikes Peak i

Quortz vein

r7l ~

FI_spormiddotquartz

Fault

X Mine worklllQl

~ Road itlt tunn












e Li

I




STRUCTURAL GEOLOGY





ST PETERS DOli


EL PASO















EXPLANATlON

B Alluvium





19~bull 0


showilg dip


JoInts ~o










ST PETERS 00






FLUORSPAR DEPOSITS



























ST pETERS DOl

FLUORSPAR~



















FLUORSPAR DEPOSITS













ST PETERS DOl









liI11berlirle

recurred






belgteamiddotted

district























- STAGE 1shy



- STAGE II-



STAGE III-





ST PETERS DOl


lt

o 40 110~~~I~--~----~----~I




districts






STAGE III-





EXPLANATION _

Lot ~PhY It

dI bull


~ 0shy

~ Ftvorsparq-n tin



~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-



j





GEOLOGY





ST PETERS DOMJ








LOGY


r veins


















EXPLANATION



r~J Pik PoGk gro1to

Quortz vein


FGutt

~-~ Rood with tunn1





ST PETERS DOM









FLUORSPAR DEPOSITS

EXPLANATION

J~~r~ 0


~ gmatif dike

~ kj

Aplit dill

Pikes Peak i

Quortz vein

r7l ~

FI_spormiddotquartz

Fault

X Mine worklllQl

~ Road itlt tunn












e Li

I




STRUCTURAL GEOLOGY





ST PETERS DOli


EL PASO















EXPLANATlON

B Alluvium





19~bull 0


showilg dip


JoInts ~o










ST PETERS 00






FLUORSPAR DEPOSITS



























ST pETERS DOl

FLUORSPAR~



















FLUORSPAR DEPOSITS













ST PETERS DOl









liI11berlirle

recurred






belgteamiddotted

district























- STAGE 1shy



- STAGE II-



STAGE III-





ST PETERS DOl


lt

o 40 110~~~I~--~----~----~I




districts






STAGE III-





EXPLANATION _

Lot ~PhY It

dI bull


~ 0shy

~ Ftvorsparq-n tin



~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-





LOGY


r veins


















EXPLANATION



r~J Pik PoGk gro1to

Quortz vein


FGutt

~-~ Rood with tunn1





ST PETERS DOM









FLUORSPAR DEPOSITS

EXPLANATION

J~~r~ 0


~ gmatif dike

~ kj

Aplit dill

Pikes Peak i

Quortz vein

r7l ~

FI_spormiddotquartz

Fault

X Mine worklllQl

~ Road itlt tunn












e Li

I




STRUCTURAL GEOLOGY





ST PETERS DOli


EL PASO















EXPLANATlON

B Alluvium





19~bull 0


showilg dip


JoInts ~o










ST PETERS 00






FLUORSPAR DEPOSITS



























ST pETERS DOl

FLUORSPAR~



















FLUORSPAR DEPOSITS













ST PETERS DOl









liI11berlirle

recurred






belgteamiddotted

district























- STAGE 1shy



- STAGE II-



STAGE III-





ST PETERS DOl


lt

o 40 110~~~I~--~----~----~I




districts






STAGE III-





EXPLANATION _

Lot ~PhY It

dI bull


~ 0shy

~ Ftvorsparq-n tin



~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-




EXPLANATION



r~J Pik PoGk gro1to

Quortz vein


FGutt

~-~ Rood with tunn1





ST PETERS DOM









FLUORSPAR DEPOSITS

EXPLANATION

J~~r~ 0


~ gmatif dike

~ kj

Aplit dill

Pikes Peak i

Quortz vein

r7l ~

FI_spormiddotquartz

Fault

X Mine worklllQl

~ Road itlt tunn












e Li

I




STRUCTURAL GEOLOGY





ST PETERS DOli


EL PASO















EXPLANATlON

B Alluvium





19~bull 0


showilg dip


JoInts ~o










ST PETERS 00






FLUORSPAR DEPOSITS



























ST pETERS DOl

FLUORSPAR~



















FLUORSPAR DEPOSITS













ST PETERS DOl









liI11berlirle

recurred






belgteamiddotted

district























- STAGE 1shy



- STAGE II-



STAGE III-





ST PETERS DOl


lt

o 40 110~~~I~--~----~----~I




districts






STAGE III-





EXPLANATION _

Lot ~PhY It

dI bull


~ 0shy

~ Ftvorsparq-n tin



~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-



FLUORSPAR DEPOSITS

EXPLANATION

J~~r~ 0


~ gmatif dike

~ kj

Aplit dill

Pikes Peak i

Quortz vein

r7l ~

FI_spormiddotquartz

Fault

X Mine worklllQl

~ Road itlt tunn












e Li

I




STRUCTURAL GEOLOGY





ST PETERS DOli


EL PASO















EXPLANATlON

B Alluvium





19~bull 0


showilg dip


JoInts ~o










ST PETERS 00






FLUORSPAR DEPOSITS



























ST pETERS DOl

FLUORSPAR~



















FLUORSPAR DEPOSITS













ST PETERS DOl









liI11berlirle

recurred






belgteamiddotted

district























- STAGE 1shy



- STAGE II-



STAGE III-





ST PETERS DOl


lt

o 40 110~~~I~--~----~----~I




districts






STAGE III-





EXPLANATION _

Lot ~PhY It

dI bull


~ 0shy

~ Ftvorsparq-n tin



~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-



e Li

I




STRUCTURAL GEOLOGY





ST PETERS DOli


EL PASO















EXPLANATlON

B Alluvium





19~bull 0


showilg dip


JoInts ~o










ST PETERS 00






FLUORSPAR DEPOSITS



























ST pETERS DOl

FLUORSPAR~



















FLUORSPAR DEPOSITS













ST PETERS DOl









liI11berlirle

recurred






belgteamiddotted

district























- STAGE 1shy



- STAGE II-



STAGE III-





ST PETERS DOl


lt

o 40 110~~~I~--~----~----~I




districts






STAGE III-





EXPLANATION _

Lot ~PhY It

dI bull


~ 0shy

~ Ftvorsparq-n tin



~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-

















EXPLANATlON

B Alluvium





19~bull 0


showilg dip


JoInts ~o










ST PETERS 00






FLUORSPAR DEPOSITS



























ST pETERS DOl

FLUORSPAR~



















FLUORSPAR DEPOSITS













ST PETERS DOl









liI11berlirle

recurred






belgteamiddotted

district























- STAGE 1shy



- STAGE II-



STAGE III-





ST PETERS DOl


lt

o 40 110~~~I~--~----~----~I




districts






STAGE III-





EXPLANATION _

Lot ~PhY It

dI bull


~ 0shy

~ Ftvorsparq-n tin



~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-









ST PETERS 00






FLUORSPAR DEPOSITS



























ST pETERS DOl

FLUORSPAR~



















FLUORSPAR DEPOSITS













ST PETERS DOl









liI11berlirle

recurred






belgteamiddotted

district























- STAGE 1shy



- STAGE II-



STAGE III-





ST PETERS DOl


lt

o 40 110~~~I~--~----~----~I




districts






STAGE III-





EXPLANATION _

Lot ~PhY It

dI bull


~ 0shy

~ Ftvorsparq-n tin



~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-



FLUORSPAR DEPOSITS



























ST pETERS DOl

FLUORSPAR~



















FLUORSPAR DEPOSITS













ST PETERS DOl









liI11berlirle

recurred






belgteamiddotted

district























- STAGE 1shy



- STAGE II-



STAGE III-





ST PETERS DOl


lt

o 40 110~~~I~--~----~----~I




districts






STAGE III-





EXPLANATION _

Lot ~PhY It

dI bull


~ 0shy

~ Ftvorsparq-n tin



~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-








ST pETERS DOl

FLUORSPAR~



















FLUORSPAR DEPOSITS













ST PETERS DOl









liI11berlirle

recurred






belgteamiddotted

district























- STAGE 1shy



- STAGE II-



STAGE III-





ST PETERS DOl


lt

o 40 110~~~I~--~----~----~I




districts






STAGE III-





EXPLANATION _

Lot ~PhY It

dI bull


~ 0shy

~ Ftvorsparq-n tin



~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-















FLUORSPAR DEPOSITS













ST PETERS DOl









liI11berlirle

recurred






belgteamiddotted

district























- STAGE 1shy



- STAGE II-



STAGE III-





ST PETERS DOl


lt

o 40 110~~~I~--~----~----~I




districts






STAGE III-





EXPLANATION _

Lot ~PhY It

dI bull


~ 0shy

~ Ftvorsparq-n tin



~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-









ST PETERS DOl









liI11berlirle

recurred






belgteamiddotted

district























- STAGE 1shy



- STAGE II-



STAGE III-





ST PETERS DOl


lt

o 40 110~~~I~--~----~----~I




districts






STAGE III-





EXPLANATION _

Lot ~PhY It

dI bull


~ 0shy

~ Ftvorsparq-n tin



~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-






liI11berlirle

recurred






belgteamiddotted

district























- STAGE 1shy



- STAGE II-



STAGE III-





ST PETERS DOl


lt

o 40 110~~~I~--~----~----~I




districts






STAGE III-





EXPLANATION _

Lot ~PhY It

dI bull


~ 0shy

~ Ftvorsparq-n tin



~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-









- STAGE 1shy



- STAGE II-



STAGE III-





ST PETERS DOl


lt

o 40 110~~~I~--~----~----~I




districts






STAGE III-





EXPLANATION _

Lot ~PhY It

dI bull


~ 0shy

~ Ftvorsparq-n tin



~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-



lt

o 40 110~~~I~--~----~----~I




districts






STAGE III-





EXPLANATION _

Lot ~PhY It

dI bull


~ 0shy

~ Ftvorsparq-n tin



~~ I~

Open cut with dump

) Portal of adlf

CJ Bulldin

120 leo Fe

tln bull 6V






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-






INDIVIDUAL DEPOSITS





ST pETERS DOME










fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-











fJ)IVlEUAL DEPOSITS











EXPLANATION

Aplit

~ PlktlPlOk


~ erROloted oronlt


I~I Quartz or


-- Fbullbull1t


II ShoN

W OPtn ltut with

dump

() Building

40 eo 120 reo Ft ~~--~I~--~~~~~~------









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-









ST PETERS 00


279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-



279

_ll~t1nln
















Dofum

EXPLANATION

Rood

CJ Building

bullShoft

~

Portol of fUMe


Trail














~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-












~-_JIIIII)_L_~___~c~____~____shy

-----------------------


EXPLANATION

~ ~


(dod wh infomdl

1m Brcclotd tfonit


8636 fat

v I Quartz or


o 10 eo 0 ItO Fltt L~__~~I~____~______-L______~I



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-



i ~(










-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-



-----~


i--___4p____

oontour


o Building

Oplft cut with dum

J____ _0__---I-Fut

infotol 10 Fot

IO



-



-



Geology and Flourspar Deposits of the St. Peters...

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Transcript of Geology and Flourspar Deposits of the St. Peters...