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R.5R.4D u l u t h C o m p l e x Cu+Ni+PGM+TiO2Exploration
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Q u e t i c o S u b p r o v i n c e
Q u e t i c o S u b p r o v i n c e
W a w a S u b p r o v i n c e
W a w a S u b p r o v i n c e
W a b i g o o n S u b p r o v i n c e
W a b i g o o n S u b p r o v i n c e
Rainy River
Kenora/Red Lake
Mine CentreHammond Reef
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OO nn tt aa rr ii oo ,, CC aa nn aa dd aa
MM ii nn nn ee ss oo tt aa ,, UU SS AA
Minnesota, U.S.A.
Ontario, Canada
Wawa
WabigoonWinnipeg R.
English RiverQueticoWawa
Abitibi
UchiBerens
Sachigo
0 10 20 30 40Miles
Printed Map Scale: 1:750,000
Printed Map Scale: 1:85,000Base Map: 1:500:000After Jirsa et al. (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 Archean Greenstone BeltsHigh Gold PotentialLand Available Known Gold Mineralization
PlutonicMetasedimentaryVolcanoplutonic
Subprovince TypesProducing MinePast ProducerExploration Areain Minnesota
Gold
Visible gold grainin a Virginia Hornquartz-feldsparporphyry drillcore that has 77.9gpt/2.3 ft.(photo courtesyof VermillionGold LLC)
Drill core from the Bigfork West Exploration Area. Gold-bearing iron formation with 5.3 gpt/5 ft.(photo courtesy of Vermillion Gold LLC)
Spot gold concentrations(ppm) in drill core from agreenstone belt nearInternational Falls, Minnesota.New semi-quantitative XRFanalyses by MnDNR.This is an example of the drillcore accessible to the public aspart of the Drill Core Library’scollection of more than 2.3million feet of archivedmaterials. This specific sectionof core was submitted by anexploration company that wasfocused on a different intervalof rock.
K n o w n G o l d M i n e r a l i z a t i o n
Exploration borehole
FaultThrust faultOutcrop (extent not to scale)
LakeSuperior
Massive granodiorite to graniteIntermediate to felsic intrusive
Mafic intrusive
Iron formationMetaconglomerate, sandstone
Metasedimentary rocks& derived gneisses
Mafic metavolcanic & metasedimentary
Bedrock Geology Base Maps: 1:500,000 (MGS)/1:1,000,000 (OGS)After Jirsa et al. (2010), OGS (1993, 2010)
DDH ND-3See photo above ofgold minera l iza t ion
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
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T.69Printed Map Scale: 1:100,000Base Map: 1:500:000After Jirsa et al. (2010)
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High Gold Potential
8016ppb Au over 2 .5 f tin DDH SS -4
Producing or past producing gold mineAdvanced explorationstage Rainy Rivergold project
References:Jirsa M and Southwick D (2003) Mineral Potential and Geology of Minnesota. Minnesota Geological Survey, University of Minnesota.Retrieved 2010-12-08.Jirsa M, Boerboom T, Chandler V, Mossler J, and Runkel A (2010) Preliminary Bedrock Geologic Map of Minnesota. Minnesota GeologicalSurvey Map Open-File Report OFR10_02. Scale 1:500,000.Ontario Geological Survey (1993) Bedrock geology, seamless coverage of the Province of Ontario; Ontario Geological Survey, Data Set 6.Scale 1:1,000,000.Ontario Geological Survey (2010) Mineral Deposit Inventory—2010.
Disclaimer and Copyright Protection: Maps, Reports, Data, and Other InformationThe State of Minnesota makes no representations or warranties express or implied, withrespect to the use of the information contained herein regardless of its format or the meansof its transmission. There is no guarantee or representation to the user as to the accuracy,currency, suitability, completeness, usefulness, or reliability of this information for anypurpose. The user accepts the information “as is." The State of Minnesota assumes noresponsibility for loss or damage incurred as a result of any user’s reliance on thisinformation. All maps, reports, data, and other information contained herein areprotected by copyright. Permission is granted to copy and use the materials herein for anylawful noncommercial purpose. Any user of this information agrees not to transmit orprovide access to all or any part of this information to another party unless the user shallinclude with the information a copy of this disclaimer.
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Penokean Pokegama Quartzite
State Land Availablefor Exploration
Public land survey townships (border varies due to scales)Public land survey sections (border varies due to scales)
Upper Red Lake
Lake of the Woods
LakeWinnibigoshishCassL.
RainyLake
Lower Red Lake
The Archean Superior Province greenstone belts that host many of Canada’s richest gold camps continuealong strike across the U.S. border and into the northern portion of Minnesota. The potential for goldproduction in Minnesota’s portions of the Wawa and Wabigoon Subprovinces is excellent, and theexploration models used for nearby gold deposits in Northwestern Ontario (e.g. Rainy River, HammondReef, Moss Lake/Shebandowan), should be considered. Overburden thickness and composition inMinnesota range from thin layers of glacial drift in the northeast, to saprolite buried under more than 100meters of glacial deposits in the northcentral part of the State. The possibility of supergene enrichmentwithin saprolitic zones adds to the list of viable ore deposit models, and expands the area of viablegreenstone belt gold exploration.
Exploration companies are exploring gold prospects on state-owned mineralleases in Minnesota’s Archean Superior Province granite-greenstone terranes.INDEX MAPINDEX MAP
Active State metallic mineral lease (As of August 13, 2012)
Exploration areas (see six inset maps for detail)Areas ever offered as State metallic mineral lease (section level)
Bi g fo rk We st
Bi g fo rk Eas t
Li nd en G rove
In t er n at i on alFa ll s
Vi r gi n ia Hor n
Ver mi l ion
Bi g f o r k We s t
Bi g f o r k E a st
Li nd e n G r ove
Vi r g in i a H o r n
Ve r m i li o n
Vermilion L.
Kabetogama L.
M e s a b i I r o n R a n g e
International Falls
Canadian National Railway
Railroads (line size and color varies due to scales)
Minnesota Department of Natural Resources, Division of Lands and Minerals,
September 2012. Director, Jess Richards
Sym b o l s em co m p as s t h i s i nd ex ma p and th e i n s e t m ap s s e en b e low