Download - Active Gold Exploration in Minnesota's Greenstone · PDF filea d a M i n n e s o t a,U S A Minnesota, U.S.A. Ontario, Canada Wawa Wabigoon Winnipeg R. English River Quetico Wawa Abitibi

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Map A

44Big Fork West Big Fork East

Linden Grove

Virginia Horn

3136 3631 31

61616

31363131 36

See Enlarged Vermilion District Area Below at a 1:100,000 Print Scale.(Township 61-63, Range 13-15)

See Enlarged Virgina Horn Area Left at a 1:100,000 Print Scale(Township 58-59, Range 15-17)

0 1 2 3 4Miles

0 2 4 6 8 10Miles

0 1 2 3 4Miles

VermilionDistrict

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D u l u t h C o m p l e x

Cu+Ni+PGM+TiO2Exploration

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Que t i co Subprov in ce

Wawa Subprov in ce

Wab igoon Subp rov ince

Rainy River

Kenora/Red Lake

Mine Centre

Hammond Reef

Map AMap A

Map BMap B

332211

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Upper Red Lake

Lake of the Woods

LakeWinnibigoshishCassL.

O n t a r i o , C a n a d a

M i n n e s o t a , U S A

Minnesota, U.S.A.

Ontario, Canada

Wawa

WabigoonWinnipeg R.

English RiverQueticoWawa

Abitibi

UchiBerens

Sachigo

Penokean B iwabik Iron Format ion

Penokean Pokegama Quartzite (Yellow)

Printed Map Scale: 1:182,500Base Map: 1:500:000After Jirsa et al. (2010), OGS (1993, 2010)

0 10 20 30 40Miles

Printed Map Scale: 1:750,000

Printed Map Scale: 1:100,000Base Map: 1:500:000After Jirsa et al. (2010), OGS (1993, 2010)

Printed Map Scale: 1:100,000Base Map: 1:500:000After Jirsa et al. (2010), OGS (1993, 2010)

Printed Map Scale: 1:12,000,000Base Maps: 1:500,000 (MGS)/1:1,000,000 (OGS)After Jirsa and Southwick (2003), OGS (2010) Active Gold Exploration in Minnesota's Greenstone BeltsHigh Gold PotentialLand Available Known Gold Mineralization

Bounding Features (Map A & B)Exploration areas (1-6)

Public land survey sectionsPublic land survey townships

Active State metallic mineral leaseArea under consideration for 2011 lease sale

Areas ever offered as State mineral lease

PlutonicMetasedimentaryVolcanoplutonic

Subprovince TypesProducing MinePast ProducerExploration Areain Minnesota

Gold

Visible goldgrain in drillcore from aVirginiaHorn quartz-feldsparporphyry thathas 77.9 gpt/2.3feet.(photo courtesyof VermillionGold LLC)

Drill core from the Bigfork West Exploration Area. Gold-bearing Iron Formation with 5.3gpt/5 ft.(photo courtesy of Vermillion Gold LLC)

New semi-quantitativeXRF spot goldconcentrations (ppm) indrill core from a granite-greenstone terrane nearInternational Falls. TheXRF analyses were donein 2010 by MnDNR.This is an example of thedrill core accessible tothe public as part of theDrill Core Library's morethan 3 million feet ofarchived materials. Thisspecific section of corewas submitted morethan 20 years ago,unsplit by an explorationcompany that wasfocused on a differentinterval of bedrock.

K n o w n G o l d M i n e r a l i z a t i o n

Granitic intrusionSyenitic, monzodioritic and dioritic plutonsMassive granitic paragneiss and migmatite

Schist of sedimentary origin

Foliated to gneissic tonalite, diorite and granodioriteAmphibolite (Quetico)

Granitic to granodioritic orthogneiss

Metagraywacke and slateIron FormationConglomerate and lithic sandstone

Bedrock Geology (Map A & B)Archean Superior Province

Exploration borehole

Fault

DikeThrust fault

Outcrop (extent not to scale)

Mafic intrusionUltramafic to mafic rocksMafic metavolcanic & metasedimentaryCalc-alkalic metavolcanicsMetavolcanic and volcaniclastic rocks, calc-alkalic affinity

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References:Jirsa M and Southwick D (2003) Mineral Potentialand Geology of Minnesota. Minnesota GeologicalSurvey, University of Minnesota. Retrieved 2010-12-08.Jirsa M, Boerboom T, Chandler V, Mossler J, andRunkel A (2010) Preliminary Bedrock GeologicMap of Minnesota. Minnesota Geological SurveyMap Open-File Report OFR10_02. Scale1:500,000.Ontario Geological Survey (1993) Bedrockgeology, seamless coverage of the Province ofOntario; Ontario Geological Survey, Data Set 6.Scale 1:1,000,000.Ontario Geological Survey (2010) Mineral DepositInventory—2010.

LakeSuperior

RainyLake

Massive granodiorite to graniteIntermediate to felsic intrusive

Mafic intrusive

Iron formationMetaconglomerate, sandstone

Metasedimentary rocks& derived gneisses

Mafic metavolcanic & metasedimentary

Generalized Bedrock Geology

Bedrock Geology Base Maps: 1:500,000 (MGS)/1:1,000,000 (OGS)After Jirsa et al. (2010), OGS (1993, 2010)

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DD H N D -3S e e p h o to b e l o w o fgo l d m i n e r a li z at i o n

2564ppb Auover 10 f tin DDH TC35-5

2480ppb Auover 4 f tin DDH TC35-33560ppb Au

over 0 .7 f tin DDH RR-1

2780ppb Auover 4 .5 f tin DDH SS -2A

2765ppb Auover 4 .5 f tin DDH SS -1

4020ppb Auover 4 f tin DDH TC35-1

Map B

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T.69Printed Map Scale: 1:100,000Base Map: 1:500:000After Jirsa et al. (2010), OGS (1993, 2010)

0 1 2 3MilesInternational Falls

High Gold Potential

8016ppb Au over 2 .5 f tin DDH SS -4

Producing or past producing gold mineAdvanced explorationstage Rainy Rivergold project

State Land Availablefor Exploration