EXTECH IV ATHABASCA URANIUM DEPOSIT DATABASE
Geological Survey of Canada, Saskatchewan Industry and Resources, and Alberta Geological Survey


DEPNO COUNTRY LOCATION ALLNAMES COMMODITIES
40016 Canada (Saskatchewan) 58.18.11 N -- 104.05.11 W Midwest Lake Uranium Deposit; Mink Arm Main, A, B and C Zones; South McMahon Lake Deposit U; Ni; Ag; Co; As

Database name: Uranium Deposits, Athabasca Basin
Custodial agency: Geological Survey of Canada
Compilers: Sunil S. Gandhi
Release date: 2007-03-02
   
Deposit name(s): Midwest Lake Uranium Deposit; Mink Arm Main, A, B and C Zones; South McMahon Lake Deposit
Political location(s): Canada; Province or state: Saskatchewan; Nearest community: Key Lake mine-mill complex (100 km NE)
NTS map data: 074I08 (Henday Lake)
Deposit clan (type): Unconformity-associated
Deposit (sub) types: Unconformity-associated - Proterozoic - clay-bound; most of the ore at unconformity; some ore in the basement and some in Athabasca sandstone; polymetallic, contains nearly as much Ni as U; Reference: Wray, E. M.; Ayres, D. E.; Ibrahim, H. J., 1985: Geology of the Midwest Uranium Deposit, Northern Saskatchewan; Chapter 2, Section Unconformity-type Deposits in Saskatchewan, In Geology of Uranium Deposits, Edited by Sibbald, T. I. I.; Petruk, W., Special Volume, The Canadian Institute of Mining and Metallurgy, The Canadian Institute of Mining and Metallurgy, 32, 268 p., p. 54 - 66
Deposit status: test producer; Size category: large; Status comments: 1.2 Mt ore
Geologic province: Churchill - Hearne Craton
Geologic subprovince: Wollaston Domain (Fold Belt)
Geologic district: Eastern Athabasca Basin
Deposit object located: drillhole
Commodities: U; Ni; Ag; Co; As
Mineralization styles: radial-textured colloform ore; pitchblende nodules; fracture-filling and dissemination; breccia - matrix; remobilized ore; cavity - fill; coating
Geological ages: Early Mesoproterozoic - Middle Mesoproterozoic (mineralization)
Tectonic setting: continental marginal deformation zone-basement reactivation; convergent; Formal name: Mudjatik Domain, east boundary (country rocks)
continental marginal deformation zone-fold belt; convergent; Formal name: linear outliers of Wollaston Group metasediments (country rocks)
continental surficial-intracratonic; stable; Formal name: sub-Athabasca Group regolith (country rocks)
continental basin-intracratonic; stable; Formal name: Athabasca Basin (country rocks)
Coincident features: lithology (over 80 % of mineralization above the graphitic horizons; rest within it to a depth of 100 m); Coincident feature name: Pelitic gneiss
fault(s) (coincident with the graphitic metapelite horizons; mineralization at fault intersection with the sub-Athabasca unconformity); Coincident feature name: Basement faults with post-Athabasca reactivation
unconformity (most of the high grade ore, up to 10 % U, is in clay masses in altered regolith at the sub-Athabasca unconformity; grades are lower above and below it); Coincident feature name: Sub-Athabasca unconformity
cross-faults (high grade ore appears to be controlled in part by west-northwest trending cross faults); Coincident feature name: West-northwest Cross Faults
Regional tectonic structure: synform in host metasedimentary sequence (interpreted synclinal structure trending 035° and with axis about a kilometre east of the Midwest deposit) Tectonic structure name: syncline
mylonitic zone (a mylonite zone along the west limb of the syncline indicated by ribbon-textured porphyritic metapelitic gneiss) Tectonic structure name: west margin fault zone
fault zone (a steep main fault along the deposit and subsidiary faults, show a 30 m down drop of the sub-Athabasca unconformity to the west) Tectonic structure name: Post-Athabasca fault zone
Host rocks: (1) metamorphic; metasedimentary schist (metapelites-metasemipelites); Depositional setting: platform-shelf; Metamorphic grade: amphibolite (upper) - granulite
External host rock forms:schistose-gneissic metasediments
Host rock protoliths:pelite and semipelite (graphite ± pyrite in argillaceous material; interbedded with semipelitic and arkosic strata); Host rock protolith name: unit of Lower Wollaston Supergroup
Internal host rock structures:foliated to gneissic; schistose
Individual lithologies:graphitic metapelite (contains varying amounts of biotite, garnet, sillimanite, cordierite and pyrite; over 80 % of mineralinzed intersections above the graphitic horizons )

(2) metamorphic; migmatite (anatectic and younger pegmatites); Depositional setting: katazonal; Metamorphic grade: amphibolite (upper) - granulite
External host rock forms:coarse grained segregations and dyke-like bodies
Host rock protoliths:paragneisses and paraschists (quartzo-feldspathic constituents of the host metasedimentary sequence; remobilized during Hudsonian thermo-tectonic event); Host rock protolith name: Wollaston Supergroup
Internal host rock structures:coarse grained, pegmatitic
Individual lithologies:pegmatite (concordant layers and lenses, and dyke-like bodies common in the metasedimentary sequence)

(3) surficial; laterite (weathered basement; profile ~50 m deep); Host series: paleoregolith; Depositional setting: subaerial; Metamorphic grade: unmetamorphosed
External host rock forms:lateritic profile
Host rock protoliths:meta-pelite and metasemipelite (paleoweathering extends relatively deeper in graphitic metapelites and along fault zones); Host rock protolith name: unit of Lower Wollaston Supergroup
Internal host rock structures:lateritic zonation
Individual lithologies:laterite (upper oxidized red hematitic zone grades below into green chloritic zone; overprinted by mineralization-related alteration at ore zone)

(4) sedimentary; sandstone-siltstone-conglomerate; Depositional setting: fluviatile; Metamorphic grade: unmetamorphosed; Component: mineralization zone
External host rock forms:thin to thick bedded, dip 5 to 15°
Host rock protoliths:quartz arenites (basal unit of Athabasca Group; sandstone and pebbly sandstone with conglomerate at base); Host rock protolith name: Manitou Falls Formation
Internal host rock structures:fine to coarse; quartz pebbles: 2-5 cm in diameter
Individual lithologies:sandstone (185-215 m thick; sandstone 80 %, conglomerate 17 % and mudstone 3 %; a conglomerate unit 50 to 60 m above the basal unconformity)
conglomerate (185-215 m thick; sandstone 80 %, conglomerate 17 % and mudstone 3 %; a conglomerate unit 50 to 60 m above the basal unconformity)
mudstone (185-215 m thick; sandstone 80 %, conglomerate 17 % and mudstone 3 %; a conglomerate unit 50 to 60 m above the basal unconformity)
Related igneous rocks: (1) intrusive; gabbro suite (dykes and sill-like intrusions); Initials: Diabase Intrusives; Magma series: calc-alkaline
Individual lithologies:diabase (altered to chlorite-sericite; most of these intrusions in and around the deposit are controlled by northeast-trending faults; one associated ore lens)

(2) intrusive; gabbro suite (northwest-trending dyke); Initials: Mackenzie diabase dyke; Magma series: calc-alkaline
Individual lithologies:diabase (one dyke at southend of the deposit is part of the northwest-trending Mackenzie swarm)
Country rocks: (1) granitic gneisses; (reactivated Archean granites); Country rock name: Midwest Granitoid Dome; Metamorphic grade: amphibolite (upper) - granulite
Country rock protoliths:granitic plutons (granite to granodiorite pluton(s) in the Archean basement of the Wollaston Group remobilized during the Hudsonian orogeny); Country rock protolith name: Archean basement granite
Individual lithologies:granitic gneiss (western granitic gneisses have fabric defined by biotite, and deformed and fractured feldspar)

(2) metapelites-metasemipelite; (pelitic gneisses); Country rock name: graphitic metapelite; Metamorphic grade: amphibolite (upper) - granulite
Country rock protoliths:pelite and semipelite (interbedded shales and siltstones; includes graphitic beds; in contact with granitic gneiss to the northwest); Country rock protolith name: unit of Lower Wollaston Group
Individual lithologies:variable; biotite±garnet±graphite (sillimanite and cordierite occur in northwestern part of the property; retrograde minerals chlorite and sericite along faults)

(3) quartzo-feldspathic paragneiss; (folded and metamorphosed); Country rock name: unit of Lower Wollaston Group ; Metamorphic grade: amphibolite (upper) - granulite
Country rock protoliths:arkosic sandstone (a psammitic sequence overlying the basal pelitic unit of the Wollaston Group); Country rock protolith name: unit of Lower Wollaston Group
Individual lithologies:quartzo-feldspathic gneiss (medium to coarse grained; plagioclase and microcline predominant; minor amounts of quartz and biotite)

(4) paleo-regolith; (up to 50 m thick lateritic profile); Country rock name: sub-Athabasca regolith; Metamorphic grade: unmetamorphosed
Country rock protoliths:granitic gneisses and metasediments (nearly peneplaned basement exposed to lateritic weathering during the Paleoproterozoic); Country rock protolith name: sub-Athabasca basement
Individual lithologies:Lateritic (thin bleached zone at the unconformity above thick red hematitic zone, which grades down to red-green chloritic zone)

(5) conglomerate-sandstone; (flat-lying, undeformed); Country rock name: Athabasca Group; Metamorphic grade: unmetamorphosed
Country rock protoliths:sandstone-pebbly sandstone-conglomerate (185 to 215 m thick in Midwest deposit area; a conglomeratic horizon separates lower 80 m section from upper section); Country rock protolith name: Lower Manitou Falls Formation
Individual lithologies:quartzose sandstone and gritstones (lower 80 m relatively more conglomeratic and has less siliceous matrix than the strata above)

(6) diabase dykes; (Mesoproterozoic dykes and sills); Country rock name: Mackenzie and Moore Lakes intrusions; Metamorphic grade: unmetamorphosed
Country rock protoliths:gabbroic magma (1267±2 Ma Mackenzie dykes form a northwest-trending swarm; 1109 Ma old Moore Lakes dykes trend northeast and associated with some sill-like bodies); Country rock protolith name: Mackenzie and Moore Lakes diabase intrusions
Metallogenic signatures: U-Ni-Co-Cu-As
Alteration signatures: retrograde metamorphism: sericitization and chloritization along faults; What was altered: paragneisses and graniitc gneisses
paleoweathering: upper oxidized zone; lower reduced zone; What was altered: sub-Athabasca basement
diagenetic alteration: illite, dominant in and around high grade ore; What was altered: Athabasca strata and basement
diagenetic alteration: hematitic beds and layers; What was altered: mafic silicates
argillic alteration: clay minerals, hematite coating, secondary silica; What was altered: metapelites and metasemipelites; Component: mineralization
sericitization: sericitization; What was altered: feldspar; Component: mineralization
sericitization: sercitization of pre-existing clay minerals; What was altered: sub-Athabasca regolith; Component: mineralization
chlorite alteration: chlorite, new generation; What was altered: sub-Athabasca regolith
tourmalinization; What was altered: sun-Athabasca regolith; Component: mineralization
desilication: quartz depletion; What was altered: sub-Athabasca regolith; Component: mineralization
graphite depletion: removal of graphite; What was altered: sub-Athabasca regolith; Component: mineralization
bleaching: bleaching of red oxidized zone; What was altered: sub-Athabasca regolith; Component: mineralization
potassic alteration: illitization or sericitization; K enrichment; What was altered: Athabasca sandstones; Component: mineralization
mineralization-related: strong illitization in and around high grade ore; What was altered: Athabasca sandstones
chlorite alteration: green coloration due to chlorite; What was altered: Athabasca sandstones; Component: mineralization
bleaching: bleaching of red diagenetic hematitic layers; What was altered: Athabasca sandstones; Component: mineralization
hematization: irregular rehematization of bleached zones; What was altered: Athabasca sandstone bleached zones; Component: mineralization
carbonation: carbonaceous sooty material and blebs; What was altered: Athabasca sandstone; Component: mineralization
uranium remobilization: remobilization of uranium by diabase intrusion; What was altered: ore deposit; Component: mineralization
Mineralogy: (fracture fillings, coatings, disseminations): pitchblende - sooty, coffinite, marcasite, gersdorffite, Ni-Co sulpharsenide, safflorite, galena, sphalerite, maucherite, hematite, kaolinite, chlorite, sericite, quartz
(nodular ore): pitchblende - massive, pitchblende - colloform, pitchblende - sooty, pitchblende - colloform/radial textured, coffinite, niccolite, gersdorffite, rammelsbergite, millerite, galena, pyrite, chalcopyrite, sericite, hematite
Radiometric ages: Object dated: Mineralization Style(1); Age - Ma: 1,331; +13; -13; Dating method: U-Pb; Concentrate: pitchblende; Source rock: uranium ore; Formal name: First Generation Pitchblende; Event dated: mineralization; Interpretive comment: upper intersept from 9 samples that are less than 10% discordant; lower intercept: 334 ± 26 Ma; Reference: Cumming, G. L.; Krstic, D., 1992: The Age of Unconformity-Related Uranium Mineralization in the Athabasca Basin, Northern Saskatchewan; Canadian Journal of Earth Sciences, Volume 29, p. 1623 - 1639

Object dated: Mineralization Style(2); Age - Ma: 1,094; +27; -27; Dating method: U-Pb; Concentrate: pitchblende and coffinite; Source rock: uranium ore; Formal name: Second Generation Mineralization; Event dated: mineralization; Interpretive comment: 10 data points form a poorly defined line, which passes through concordia origin; Reference: Worden, J. M.; Cumming, G. L.; Baadsgaard, H., 1985: Geochronology of the Host Rocks and Mineralization of the Midwest Uranium Deposits, Northern Saskatchewan; Chapter 2, Section Unconformity-type Deposits in Saskatchewan, In Geology of Uranium Deposits, Edited by Sibbald, T. I. I.; Petruk, W., Special Volume, The Canadian Institute of Mining and Metallurgy, The Canadian Institute of Mining and Metallurgy, 32, 268 p., p. 67 - 72

Object dated: Related Magmatic Rx(1); Age - Ma: 1,084; +54; -54; Dating method: K-Ar; Concentrate: whole rock; Source rock: diabase intrusion; Formal name: intrusion-related remobization of ore; Event dated: post-mineralization (intrusion); Interpretive comment: average of 3 K-Ar ages: 1062, 1085 and 1105 Ma; close to 1094 ± 27 Ma old remobilized pitchblende ; Reference: Worden, J. M.; Cumming, G. L.; Baadsgaard, H., 1985: Geochronology of the Host Rocks and Mineralization of the Midwest Uranium Deposits, Northern Saskatchewan; Chapter 2, Section Unconformity-type Deposits in Saskatchewan, In Geology of Uranium Deposits, Edited by Sibbald, T. I. I.; Petruk, W., Special Volume, The Canadian Institute of Mining and Metallurgy, The Canadian Institute of Mining and Metallurgy, 32, 268 p., p. 67 - 72

Object dated: Related Magmatic Rx(2); Age - Ma: 1,267; +2; -2; Dating method: U-Pb; Concentrate: baddeleyite; Source rock: diabase intrusion; Formal name: intrusion-related remobiliztion of ore; Event dated: post-mineralization (intrusion); Interpretive comment: a northwest-trending dyke at south end of Midwest Lake deposit belongs to the Mackenzie dyke swarm; Reference: LeCheminant, A. N.; Heaman, L. M., 1989: Mackenzie Igneous Events, Canada: Middle Proterozoic Hotspot Magmatism Associated with Ocean Opening; Earth and Planetary Science Letters, Volume 96, p. 38

Object dated: Country Rocks(1); Age - Ma: 2,613; +93; -93; Dating method: Rb-Sr; Concentrate: whole rock; Source rock: granitic gneiss; Formal name: emplacement age of western gneiss; Event dated: remobilized Archean granitoid; Interpretive comment: 5 of the 12 samples analyzed are collinear; rest indicative of incomplete response to younger events; Reference: Worden, J. M.; Cumming, G. L.; Baadsgaard, H., 1985: Geochronology of the Host Rocks and Mineralization of the Midwest Uranium Deposits, Northern Saskatchewan; Chapter 2, Section Unconformity-type Deposits in Saskatchewan, In Geology of Uranium Deposits, Edited by Sibbald, T. I. I.; Petruk, W., Special Volume, The Canadian Institute of Mining and Metallurgy, The Canadian Institute of Mining and Metallurgy, 32, 268 p., p. 67 - 72

Object dated: Country Rocks(2); Age - Ma: 1,711; +8; -8; Dating method: Rb-Sr; Concentrate: biotite; Source rock: biotitic paragneiss; Formal name: Hudsonian metamorphism; Event dated: cooling; Interpretive comment: 8 samples of metapelitic and biotite-quartz gneiss define isochron and indicate end of metamorphism ; Reference: Worden, J. M.; Cumming, G. L.; Baadsgaard, H., 1985: Geochronology of the Host Rocks and Mineralization of the Midwest Uranium Deposits, Northern Saskatchewan; Chapter 2, Section Unconformity-type Deposits in Saskatchewan, In Geology of Uranium Deposits, Edited by Sibbald, T. I. I.; Petruk, W., Special Volume, The Canadian Institute of Mining and Metallurgy, The Canadian Institute of Mining and Metallurgy, 32, 268 p., p. 67 - 72

Object dated: Alteration Signature(6); Age - Ma: 1,337; +11; -11; Dating method: Rb-Sr; Concentrate: sericite - pearly young; Source rock: wallrock; Formal name: main mineralization event; Event dated: alteration (hypogene); Interpretive comment: 9 of 11 data points define an isocron indicative of a relatively lower temperature alteration event; Reference: Worden, J. M.; Cumming, G. L.; Baadsgaard, H., 1985: Geochronology of the Host Rocks and Mineralization of the Midwest Uranium Deposits, Northern Saskatchewan; Chapter 2, Section Unconformity-type Deposits in Saskatchewan, In Geology of Uranium Deposits, Edited by Sibbald, T. I. I.; Petruk, W., Special Volume, The Canadian Institute of Mining and Metallurgy, The Canadian Institute of Mining and Metallurgy, 32, 268 p., p. 67 - 72
Deposit shape: cigar-shaped
Deposit dimensions:length: 900 metre
width: 50 metre
thickness: 36 metre
Qualified comments: (Applies to: discovery and development) A glacial bounder train led to discovery in 1978; outlined by 488 drill holes; min-able resources in 1981: 19300 t U in 1.2 Mt of ore averaging 1.6 % U and 1.59 % Ni; plus 2300 t U in lower grade ore. in 1988-1989 test mining from a 185 m shaft; revised estimate of mine-able reserves in 1990: 13850 t U in 0.363 Mt of ore averaging 3.816 % U at cut-off grade of 0.424 % U; same figures reported in 2001. Most of the high grade ore occurs at northeast end of the deposit, where ore zone is as much as 150 m wide and occurs at the sub-Athabasca unconformity; basement ore extends for minimum 100 m below it. The main zone is under water at southwest end of Mink Arm of Midwest Lake; subsidiary discontinuous small zones, referred to as A, B and C zones, occur to the northeast along Mink Arm over 2.5 km strike zone. It has been dormant since 1995.
Links to other databases: SMDI; Key value: 1720
GSC U-Th File (Prasad); Key value: 2714
References:
Baadsgaard, H.; Cumming, G. L.; Worden, J. M., 1984
U-Pb Geochronology of Minerals from from the Midwest Uranium Deposit, Northern Saskatchewan
Canadian Journal of Earth Sciences, Volume 21, p. 642 - 648

Bennett, R. W., 2002
Geological Atlas of Saskatchewan, Version 5 (2002)
Government of Saskatchewan, CD-ROM

Cumming, G. L.; Kristic, D.; Wilson, J. A., 1987
Age of the Athabsca Group, Northern Alberta
In Program with Abstracts: Joint Annual Meeting, Geological Association of Canada-Mineralogical Association of Canada, Edited by Anonymous, Program with Abstracts, Joint Annual Meeting, Geological Association of Canada and Mineralogical Association of Canada, Geological Association of Canada, 12, p. 35 - 35

Cumming, G. L.; Krstic, D., 1992
The Age of Unconformity-Related Uranium Mineralization in the Athabasca Basin, Northern Saskatchewan
Canadian Journal of Earth Sciences, Volume 29, p. 1623 - 1639

Farstad, J.; Ayers, D. E., 1986
Geology of the Midwest Uranium Deposit, Northern Saskatchewan
Chapter 4, Section Saskatchewan Unconformity-associated and Sedimentary-hosted Deposits of Helikian Age, In Uranium Deposits of Canada, Edited by Evans, E. L., Special Volume, The Canadian Institute of Mining and Metallurgy, The Canadian Institute of Mining and Metallurgy, 33, 323 p., p. 178 - 183

French, J. E.; Chacko, T.; Heaman, L. M., 2001
Chemical U-Th-total Pb Dating of Baddeleyite by Electron Microprobe
Section Abstracts, In Eleventh Annual V. M. Goldschmidt Conference, Edited by Anonymous, Abstracts (CD-ROM), Lunar and Planetary Institute, Houston

Gandhi, S. S., 1995
An Overview of the Exploration History and Genesis of Proterozoic Uranium Deposits in the Canadian Shield
Exploration and Research for Atomic Minerals, Department of Atomic Energy, India, Volume 8, p. 1 - 48

Hoeve, J. , 1984
Host rock alteration and its application at the Midwest Lake Uranium Deposit, Northern Saskatchewan
Bulletin of the Canadian Institute of Mining and Metallurgy, Volume Aug84, p. 63 - 72

Ibrahim, H. J.; Woo, H. F., 1985
Geochemical and Mineralogical Alteration at the Midwest Uranium-Nickel Deposit
Chapter 2, Section Unconformity-type Deposits in Saskatchewan, In Geology of Uranium Deposits, Edited by Sibbald, T. I. I.; Petruk, W., Special Volume, The Canadian Institute of Mining and Metallurgy, The Canadian Institute of Mining and Metallurgy, 32, 268 p., p. 73 - 84

Kirwan, L. D., 1978
The Discovery of the Midwest Lake Uranium Deposit
In Uranium Exploration Techniques: 1978 November 16-17 Regina Symposium Proceedings, Edited by Parslow, G. R., Special Publication, Saskatchewan Geological Society, 4, 330 p., p. 59 - 80

Kirwan, L. D., 1979
The Discovery of the Midwest Lake Uranium Deposit
In Proceedings of Symposium on Uranium Exploration Techniques, Edited by Parslow, G. R., Proceedings

Kirwan, L. D., 1979
Case History of the Midwest Lake Uranium Discovery, Saskatchewan
In Abstracts: Annual Canadian Mining and Metallurgy Meeting, Montreal, Quebec , Edited by Canadian Mining and Metallurgy, Abstracts, Canadian Mining and Metallurgy, 1979

LeCheminant, A. N.; Heaman, L. M., 1989
Mackenzie Igneous Events, Canada: Middle Proterozoic Hotspot Magmatism Associated with Ocean Opening
Earth and Planetary Science Letters, Volume 96, p. 38

MacDougall, D. G.; Williams, D. H., 1993
The Moore Lakes Complex, Neohelikian Olivine Diabase Lopoliths in the Athabasca Group (Part of NTS 74H-6 and 7)
In Summary of Investigations 1993, Edited by Anonymous, Miscellaneous Report, Saskatchewan Geological Survey, Saskatchewan Department of Mines and Energy, 93-4, p. 86 - 91

Picklyk, D. D.; Rose, D. G.; Laramée, R. M., 1978
Canadian Mineral Occurrence Index (Canmindex) of the Geological Survey of Canada
Paper, Geological Survey of Canada, Geological Survey of Canada, Publication code 78-8, 27 p..

Powers, L. J.; Stauffer, M. R., 1988
Multigeneration Pitchblende from Midwest Uranium-Nickel Deposit, Northern Saskatchewan
Canadian Journal of Earth Sciences, Volume 25, p. 1945 - 1954

Prasad, N., 1981
Distribution of Uranium and Thorium Occurrences in Canada
Open File, Geological Survey of Canada, Geological Survey of Canada, Publication code 551, 110 p..

Prasad, N., 2002
Uranium File: Canmindex
Geological Survey of Canada, Canadian Mineral Occurrence Index (Canmindex), CD-ROM

Saskatchewan Geological Survey, 2003
Geology, and Mineral and Petroleum Resources of Saskatchewan
Miscellaneous Report, Saskatchewan Industry and Resources, Publication code 2003-7, 173 p., 4 maps.

Saskatchewan Industry and Resources, 2001
Saskatchewan Mineral Deposits Index
Government of Saskatchewan, Geological Atlas of Saskatchewan, Internet

Scott, F., 1981
Midwest Lake Uranium Discovery, Saskatchewan, Canada
In Uranium Exploration Case Histories: Proceedings of an Advisory Group Meeting, Vienna, 26-29 November 1979, Edited by Anonymous, Proceedings Series (STI/PUB), International Atomic Energy Agency, Vienna, International Atomic Energy Agency, Vienna, 584, 407 p., p. 221 - 242

Scott, F., 1983
Midwest Lake Uranium Discovery
Section Introductory Papers, In Uranium Exploration in Athabasca Basin, Edited by Cameron, E. M., Paper, Geological Survey of Canada, Geological Survey of Canada, 82-11, 310 p., 8 maps, p. 41 - 50

Thomas, D. J.; Mathews, R. B.; Sopuck, V., 2000
Athabasca Basin (Canada) - Unconformity-type Uranium Deposits: Exploration Model, Current Mine Development and Exploration Directions
In Geology and Ore Deposits 2000: the Great Basin and Beyond; May 15 - 18, 2000 Symposium Proceedings (CD-ROM), Edited by Cluer, J. K.; Price, J. G.; Struhsacker, E. M.; Hardyman, R. F.; Morris, C. L., Symposium Proceedings, Geological Society of Nevada, Geological Society of Nevada, Reno, Nevada, 647 p., p. 103 - 126

Thomas, D. J.; Jefferson, C. W.; Card, C.; Yeo, G.; Sopuck, V., 2002
Introduction: the Eastern Athabasca Basin and its Uranium Deposits
Chapter 1, In Field Trip A1: the Eastern Athabasca Basin and its Uranium Deposits, May 24-26, 2002, GAC-MAC Saskatoon 2002, Edited by Andrade, N; Breton, G.; Jefferson, C. W.; Thomas, D. J.; Tourigny, G.; Wilson, S.; Yeo, G. M., Field Guide Book, Geological Association of Canada - Mineralogical Associationof Canada, Geological Association of Canada, 102 p., p. 1 - 22

Tremblay, L. P., 1982
Geology of the Uranium Deposits Related to the Sub-Athabasca Unconformity
Paper, Geological Survey of Canada, Publication code 81-20, 56 p..

Worden, J. M.; Cumming, G. L.; Baadsgaard, H., 1985
Geochronology of the Host Rocks and Mineralization of the Midwest Uranium Deposits, Northern Saskatchewan
Chapter 2, Section Unconformity-type Deposits in Saskatchewan, In Geology of Uranium Deposits, Edited by Sibbald, T. I. I.; Petruk, W., Special Volume, The Canadian Institute of Mining and Metallurgy, The Canadian Institute of Mining and Metallurgy, 32, 268 p., p. 67 - 72

Wray, E. M.; Ayres, D. E.; Ibrahim, H. J., 1985
Geology of the Midwest Uranium Deposit, Northern Saskatchewan
Chapter 2, Section Unconformity-type Deposits in Saskatchewan, In Geology of Uranium Deposits, Edited by Sibbald, T. I. I.; Petruk, W., Special Volume, The Canadian Institute of Mining and Metallurgy, The Canadian Institute of Mining and Metallurgy, 32, 268 p., p. 54 - 66

Resource data:
Disclaimer - Reserves/Resource Data

Her Majesty the Queen in Right of Canada, represented by the Minister of Natural Resources (NRCan) does not warrant or guarantee the accuracy, completeness or fitness for any purpose of Reserve and Resource information (Data) contained in this database, including whether the Data is compliant with any securities regulations or standards, and NRCan does not assume any liability with respect to any damage or loss incurred as a result of the use made of the Data.

Resource and reserve figures are historical in nature. The Data source provided with each set of figures should be cited if the Data are re-reported.

Estimate date: 2000; 2.033 million metric tons ore; Combined with production?: no; Provisional entry?: no; Resource category: proven + probable
Grade-commodity information:U: 1.06 percent
Ni: 1.59 percent
weight-commodity information:U: 21,550 metric ton
Reference: Thomas, D. J.; Jefferson, C. W.; Card, C.; Yeo, G.; Sopuck, V., 2002: Introduction: the Eastern Athabasca Basin and its Uranium Deposits; Chapter 1, In Field Trip A1: the Eastern Athabasca Basin and its Uranium Deposits, May 24-26, 2002, GAC-MAC Saskatoon 2002, Edited by Andrade, N; Breton, G.; Jefferson, C. W.; Thomas, D. J.; Tourigny, G.; Wilson, S.; Yeo, G. M., Field Guide Book, Geological Association of Canada - Mineralogical Associationof Canada, Geological Association of Canada, 102 p., p. 1 - 22
Percent weights allocated to deposit: 100.0%
Associated mine(s): Midwest Uranium Mine (40019)

Generated 2007-03-02 2:36:34 PM with GQuery -- 3.7 ADO (3.19/3.20/3.21 -- 2006-02-24)
GlobalDB System, Geological Survey of Canada, Natural Resources Canada