GROUND MAG SUR RESULTS FROM SHERATON SOUTH CL GRP ...
Transcript of GROUND MAG SUR RESULTS FROM SHERATON SOUTH CL GRP ...
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42A87NE8218 2,11117 SHERATON010
Ground Magnet!^ Survey Results From the Sheraton South Claim Group
Lightning River Project, Ontario
for
Placer Dome Inc.
by
A.G. Ryc^er-Turner,
J. B. Boniwell
Excalibur International Consultants Ltd.
March 21, 1988
RECEIVED
APR 2 8 1988
MINING LANDS SECTION
BXGAblBUR INTERNATIONAL CONSULTANTS LTD.
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^A 42 A87NEea IB 2.11117 SHERATON 010CW
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LIST OF CONTENTS
Introduction Page 1 Description of Property 2Details of Survey 3Discussion of Results 4Conclusions and Recommendations 6
LIST OF DRAWINGS
DWG. NO. TITLE SCALE
EIC-1860A Elements of Interpretation 1:2500
REFERENCE MAPS
PD 212-17 Magnetic Data 1:2500212-17A Magnetic Contours 1:2500
^ BXGAblBUR"in INTERNATIONALXf CONSULTANTS bTD.
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INTRODUCTION
This report is submitted as a supplement to Excalibur report #87-P-8, V.L.F. Survey Results from the Sheraton South Claim Group, Lightning River Ptoject, Ontario.
The Sheraton South claim group was acquired as a result of an earlier integrated study of available geology and airborne geophysical data for the region delineating potential areas for gold mineralization.
A ground magnetic survey was commissioned following recommendations presented in the above report. The present reporting presents and discusses the results of this latest surveying.
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DESCRIPTION OF PROPERTY
The subject property is composed of fourteen (14) contiguous non-patented claims, each nominally of 40 acres (16 hectares). The claims are identified as:
Claim Nos. P950074 - P950087 inclusive
which in aggregate form a near-*rectangular block in the southeast corner of Sheraton Township, Porcupine Mining Division, Ontario. One alien claim falls within the group to form a hole (Fig. 2).
The claims are registered in the name of Placer Development Ltd., at that time located at 401 Bay St., Toronto, but now situated in the T-D Centre, viz. Suite 3500, IBM Tower, Box 350, Toronto, Ontario, M5K 1N3.
Access to the propety is fairly had south by bush road from Lipsett Lake 4 kms itself is reached by good gravel road from approximately 25 kms to the NNW. The land is forested with typical taiga growth. The higher to the east and south, but generally swampy ground and several beaver ponds make locally.
overland from the away. Lipsett Lake provincial highway 101 area within the claims terrain is slightly drainage is poor, and for wet conditions
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Placer Dome Inc. Location of Claim Groups Lightning River Project, Ontario February. 1988
FIGURE
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DETAILS OF SURVEY
The required grid of lines was prepared under contract for the earlier VLF-EM survey. It was re-occupied for the present work.
The lines themselves were oriented geographic N-S and were cut, chained and picketed to the property limits. The lines were spaced 100 metres apart and picketed at an interval of 25 metres. An orthogonal baseline, together with a parallel tie-line 1150 metres to the north, controlled this work.
The magnetic surveying of this grid was completed with a Geometrics G856 proton precession magnetometer, which measured the total magnetic field to within */- l nano-Tesla (nT). Diurnal variation was recorded by a field base-station . magnetometer, which provided continuous readings during the course of the survey. The base-station was located at 1150N, 785E on the grid, and assigned a nominal value of 58,938 nT. All grid data were then corrected for diurnal variation and normalized to this datum.
Results are shown both as profiles stacked against their line of recording (Dwg. No. PD+-212-17), and as contours {Dwg. No. PD-212-17A), the plan scale being 1:2500 in both cases. The station interval for these observations was 12.5 metres along the line.
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DISCUSSION OF RESULTS
The magnetic responses cover a considerable range of values (58,350 to 71,682 nT) despite the small size of the area surveyed. The resulting contour map, however, is coherent and offers a good deal of information about the sub-surface. An interpretation map (Dwg. No. EJC-1860A) has been prepared showing the inferred sources and their boundaries, and possible structural control.
While considerable complexity is observed, this is mostly due to local variation of the magnetic properties and structural breaks within the lithological units. In broad detail, three distinctive units are differentiated based on their magnetic response. A fourth unit, characterized by its variable response and linear nature, is also recognized.
The grid is dominated by a unit (I) of low level response which occupies the centre of the area. Magnetic variation within this unit is typically low, and thus information concerning structural imprints through this domain is difficult to determine. On the eastern margin in direct contrast with the foregoing unit, is a unit (II) characterized by extremely high magnetic activity. The rocks within this unit appear highly fragmented by E-W trending lineaments, despite the apparent overall N-S trend. The third magnetic unit (III) exhibits a more moderate magnetic response and occupies the western and southern margins of the survey area. The fourth unit (IV), apparent as broken-up N-S striking magnetic ridges on lines 500E, 800E, 1300E, 1400E, 1500E, and 1600E are interpreted to be diabase dykes belonging to the Matachewan dyke swarm.
Little geologic information is available concerning the variety of rock types within this area. The published ODM compilation (Map #2205, Timmins-Kirkland Lake) defines the entire claim group as being underlain by undifferentiated metavolcanics (greenstones), cut in places by N-S trending diabase dykes. In this case, unit (I) may represent felsic tuffs and flows or other volcanic elastics; unit (II) may belong to anultramafic/ultrabasic lithology e.g. komatiites, but including the probability locally of weak iron formation (IF) horizons as shown, while unit (III) may represent dacitic/basaltic flows, dykes etc. Within units (II) and (III), areas of low magnetic response are observed. These may represent zones of alteration, that is magnetite depletion, within the host unit.
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A large amount of structural information can be gleaned from the magnetic data, which is largely consistent with, and enlarges upon, the original VLF-EM interpreted lineaments. In general the area is dominated by E-W trending lineaments, most of which are interpreted to be faults/shears. Several high-angle, NW-SE trending faults are observed, and largely because of empirical reasons, these are regarded as most likely to provide favourable localities for mineralization, especially where they intersect the E-W shears.
Major dislocations are inferred along the boundary between units (I) and (II), as evidenced by the observed offsets. Also the central of three NW-SE striking faults in the grid southwest exhibits an evident dextral movement, as well as down-throwing the western side.
Four zones, designated A to D, have been selected as sites potentially favourable to mineralization and deserving of further attention. They will be discussed in their perceived order of importance.
Zone A: is selected as the most favourable as it is cut by two NW-SE striking lineaments and contains possible zones of alteration associated with E-W striking features within. Further, it is possible that a larger and deeper zone of alteration exists to the west side.
Zone B: is situated at the intersection of E-W oriented lineaments, a major NW-SE striking lineament, and the contact between units (I) and (II) itself. 1 An extensive embayment in this contact could signify important alteration locally. Adding to the contrast here are two flanking diabase dykes.
Zone C: is favourable for the same reasons as zone B, but appears to lack the presence of srong NW-SE faulting at its heart.
Zone D: is similar to zone C, but much smaller in size. It is included here for completeness only.
BXGAblBURINTERNATIONAbCONSULTANTS
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CONCLUSIONS AND RECOMMENDATIONS
It is concluded that the subject magnetic survey has been effected in a competent fashion, and that the data collected fulfilled all aspects of accuracy and levelling required. It has successfully delineated the underlying lithology and structure within the limitations of the method, and when integrated with the VLF-EM results, has provided four zones of interest which should receive further attention.
It is suggested that further work should consist of a survey using the Induced Polarization (IP) method in an attempt to locate the disseminated sulphides with which gold is known to be associated in this style of mineralization. The following programme is recommended:
Zone A: Survey Lines 400E to 1000E between BL 00 and 400N. Cut and survey the cross-lines 100N and 200N between 400E and 1100E.
Zone B and C: Survey Lines 1400E, 1500E, 1600E and 1700E to the limits of the grid. 1300E is also of interest. Additional E-W lines at 400N and SOON, and at SOON and 900N extending 200 metres to either side of the inferred contact are also suggested, if results are promising.
Zone D: Not a high priority, but may be surveyed on lines 100E and 200E, betweea SOON and 1100N.
It is felt that such a follow-up strategy will provide enough definitive information to determine whether drilling is necessary and, if so, the sites to be occupied for an appropriate lay-out of holes.
March 21, 1988 lyder-TurnerRation Geophysical Consultant,
J. B. BoniwellExploration Geophysical Consultant.
BXGAblBUR INTERNATIONAL CONSULTANTS LTD.
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
/^™X Ministry of Geophysical-Geological-Geochemical f M Vy ) Northern Development Techrtical Data Statement
^\^oLs and Mines Ontario File
TO BE ATTACHED AS AN APPENDIX TO TECHNICAL REPORT FACTS SHOWN HERE NEED NOT BE REPEATED IN REPORT
TECHNICAL REPORT MUST CONTAIN INTERPRETATION. CONCLUSIONS ETC.
Type of Survcy(s) GROUND MAGNETOMETER
Township or Area SHERATON TWP .
Claim Holder(s) PLACER DOME INC. STTTTP v;nn; TBM T^WEI
TORONTO- DOMTOM PTR , TOpONTn , nNTARl'ri
c ,, PLACER DOME INC. Survey Company
Author of Report MR- J- B. BONIWELL
Address of Author 10 HURONTARIO ST. , MISSISSAUGA, ONTARIO
Covering Dates of SurveyfJOV. 1 1 /R7 i-m" ' ( Unecutting to office)
T . i JS?PX r r- /^ 24.7 Km. Total MJtbof of Line Cut :
SPECIAL PROVISIONS h*vs CREDITS REQUESTED ^^..^ p" cUira
-Electromagnetic . ...H- . ENTER 40 days (includes ' ny.,.. ,.- \ r r- — M wnrtnmeter, , ,rline culling) lor tirst 6 survey. — Rndiometric. ,. —————
ENTFR 20 days for each -Othrradditional survey using r.^]^;™!same grid. " . Oorhrmici'l, ,
AIRBORNE CREDITS (Special provision credits do not WjP'y to airborne tuiveyi)
Magnetometer F.|^^trnmagnrt!r /M*Hjnmrtrir(enter dayj per claim) x. ^l ^v - , -^
HATEt 21ST, MARCH,'88sir.MATimP.. ' :Author of Report or Agent
RCS. Geol. Onalifirations (o S ' 1^ 4";
Previous SurveysFile No. Type Date Claim Holder
MINING CLAIMS TRAVERSED List numerically
(prefix) (number)
.................P..................9.5.0.0.7.4.................
P 950075
,..,,.........?...................?.5.Q.Q.m.,..,.,.....,
.................?. ...... .........35.0.0.7.7.... ...... ......,
...............^..................95.0.0.7.8.................
................^.................3500.7.7.................
P QSflfl 79
...P .. ...........950DJ3D................
................B..........:.......950DBJL...............
................B..................9SDOS2................
B QCAOQ "3
P 950084
P 950085
P 950086
P 950087
4
If ipcce iruufficient, attach lilt
837 (85/12)
GEOPHYSICAL TECHNICAL DATA
GRCJOND SURVEYS — If more than one survey, specify data for each type of survey
Number of Stations
Station interval 25 M. readings @ 12.5 M.
Profile scale______________________Contour interval 25 aairanas
Instrument
ll GRcW
l
l
l
l
l
l
l
li ii i i i
r825 .Number of Readings
.Line spacing ——.—
1649
100 M.
Geometrics G 856
Accuracy — Scale constant * l gamma——^———^^——————-———-
Diurnal correction method—————^——-^—————.^—^—-————.—.—.—-— Base Station check-in interval (hours) Continuous -Base Magnetometer
Base Station location and value TL. 11 4- SON, 7 f 85E. 58,938 nT
t/5bJos
Instrument
Coil configuration Coil separation — Accuracy -—.—— Method: Frequency————
D Fixed transmitter D Shoot back D In line D Parallel line
(specify V.L.F. station)
Parameters measured.
Instrument.Scale constantCorrections made.
Base station value and location.
Elevation accuracy.
Instrument ————-————. Method l~l Time Domain Parameters — On time ——
- Off time ———.— Delay time ——-— Integration time
D Frequency Domain _ Frequency _____ _ Range ————————
Power —^—^-—- Electrode array — Electrode spacing Type of electrode
Ministry ofNorthern Development and Mines
t 339
Report of Work(Geophysical, Geological, Geochemical and Expenditt
CUMBNT No.
8806
ructions: — Please type or print.- If number of mining claims traversed
exceeds space on this form, attach a list.Note: — Only days credits calculated in the
"Expenditures" section may be entered
Mining A
Claim Holder(s) -GROUND-MAGNETOMETER-
DOME INC. 42A87NEe2l8 2.1)117 SHERATON300Address
SUITE 3500, IBM TOWER, TD CENTRE, TORONTO, ONTARIOSurvey Company
PLACER DOME INC.p m Si t o)Oare of Surve
Day l Mo. j Yr. | Day | Mo. | Yr.
ital*?fiS of lin24.7 kmTotal*?fiS of line Cut
Name and Address of Author (of Geo-Tecnnical report)
J. B. BONIWELL, 10 HURQNTARIO STREET, MISSISSATJGA, ONTARIO. L5G 3G7.Credits Requested per Each Claim in Columns at rightSpecial Provisions
For first survey:
Enter 40 days. (This includes ine cutting)
For each additional survey: using the same grid:
Enter 20 days (for each)
Man Days
Complete reverse side and enter total (s) here
Airborne Credits
Note: Special provisions credits do not apply to Airborne Surveys.
Geophysical
- Electromagnetic
- Magnetometer
- Radiometric
- Other
Geological
Geochemical
Geophysical
- Electromagnetic
- Magnetometer
- Radiometric
- Other
Geological
Geochemical
Electromagnetic
Magnetometer
t'iPftl?^Expenditure (d*4ll^i,\?dlfe?ytrVffpf(lgiType of Work PeiiSrVfed
APR ?o "l^fl
nv
Days per Claim
20
Days per Claim
Days per Claim
us tl
Performed on Ilaimis)
Calculation of Expenditure Days Credits
Total Expenditures
S -4- 15
Total Days Credits
s
Instructions Total Days Credits may be apportioned at the claim holder's choice. Enter number of days credits per claim selected in columns at right.
Date Recorded Holcfer or Agent (Signature) ^ i,- - /tt^/ 7t t^-t *-——
Certification Verifying Report of Work
Mining Claims Traversed (List in numerical sequence)A ining Claim
Prefix Number
950074950075
950076950077
950078
950079
950080
950081
950082
950083
950084
950085
950086
950087
AftlO GEOLOGIC* l SUN :| ASSESSMENT- *ttES
OFFICE
JUL15
E c E i v
Expend. Days Cr,
ED
Mining ClaimPrefix Number
C IK c * * rn r* E l y : JL
'..'JHQ QC^T
HECOS
APR
Expend. Days Cr.
w-1988-
Total number of mining claims covered by this report of work.
For Office Use OnlyTotal Days Cr, Recorded
Date Recorded
Date Approved as Recorded
Mining
l hereby certify that l have a personal and intimate knowledge of the facts set forth in the Report of Work annexed hereto.*Qving performed the work or witnessed same during and/or ;iftcr its completion and the annexed report is true,
Name and Postal Address of Person CertifyingJ. B. BONIWELL, 10 HURONTARIO STREET, MISSISSAUGA, ONTARIO. L5G 3G7,
1362 185/12)
Date Certified
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Mar
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1988
BA
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17
Dwg.
No.
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C-1
860A
42Aa7NE0218 2.11117 SHERATON
23
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