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


DEPNO COUNTRY LOCATION ALLNAMES COMMODITIES
40009 Canada (Saskatchewan) 57.12.11 N -- 105.39.60 W Gaertner Orebody; Cobble Orebody; Key Lake Uranium Mine U; Ni; As; Pb; Zn; Cu

Database name: Uranium Deposits, Athabasca Basin
Custodial agency: Geological Survey of Canada
Compilers: Sunil S. Gandhi
Release date: 2007-03-02
   
Deposit name(s): Gaertner Orebody (occurrence name); Cobble Orebody (occurrence name); Key Lake Uranium Mine (mine name)
Political location(s): Canada; Province or state: Saskatchewan; Nearest community: La Ronge (240 km 355°)
NTS map data: 074H04 (Zimmer Lake)
Deposit clan (type): Unconformity-associated
Deposit (sub) types: Unconformity-associated - Proterozoic - clay-bound; Low temperature U-Ni mineralization formed initially as supergene enrichment in tectonic traps by weathering of basement rocks, and was later redistributed during diagenesis of the Athabasca Group.; Reference: Dahlkamp, F. J., 1978: Geologic Appraisal of the Key Lake U-Ni Deposits, Northern Saskatchewan; Economic Geology, Volume 73, p. 1430 - 1449
Deposit status: past producer; Size category: small; Status comments: 3.7 Mt of ore for total Key Lake deposits, including Deilman and Cobble Ore
Geologic province: Churchill - Hearne Craton
Geologic subprovince: Wollaston Domain (Fold Belt)
Geologic district: Eastern Athabasca Basin
Deposit object located: drill hole
Commodities: U; Ni; As; Pb; Zn; Cu
Mineralization styles: massive deposition below unconformi; veining in basement at unconformity; dissemination below unconformity
Geological ages: Late Paleoproterozoic - Middle Mesoproterozoic (country rocks)
Late Paleoproterozoic - Middle Mesoproterozoic (host rocks)
Middle Mesoproterozoic - Late Mesoproterozoic (mineralization)
Middle Mesoproterozoic - Late Mesoproterozoic (alteration)
Tectonic setting: epicontinental deformation zone-fold and thrust; transpressive; Formal name: Wollaston fold belt (host rocks)
epicontinental deformation zone-basement reactivation; transpressive; Formal name: granite gneiss domes (host rocks)
epicontinental deformation zone-refolding; transpressive; Formal name: late stage of Hudsonian orogeny (host rocks)
epicontinental deformation zone-folding and thrusting; transpressive; Formal name: Key Lake fault/fault zone (host rocks)
continental craton-paleoweathering; stable; Formal name: sub-Athabasca paleoregolith (host rocks)
continental basin-intracratonic; stable; Formal name: Athabasca basin (host rocks)
continental craton-fault reactivation; transpressive; Formal name: post-Athabasca fault movement (host rocks)
Coincident features: unconformity (mineralization straddles the unconformity; mainly within paleoregolith; extends into basement); Coincident feature name: Sub-Athabasca unconformity
fault zone (major east-northeast trending reverse fault zone dipping moderately to northwest; subparallel to metasedimens; marked by multiple movements); Coincident feature name: Key Lake fault/fault zone
paleoregolith
Host rocks: (1) metamorphic; paragneiss (biotite-plagioclase-cordierite gneiss); Depositional setting: platform-shelf; Metamorphic grade: amphibolite - upper
Host rock protoliths:carbonaceous shale-siltstone (most abundant host rock of the Key Lake deposits; contains quartz, and some chlorite, hornblende, pyroxene); Host rock protolith name: unit of Wollaston Supergroup
Internal host rock structures:thin beds
Individual lithologies:biotitic gneiss (the main host rock; biotite-plagioclase-cordierite-quartz gneiss, with some layers rich in chlorite/hornblende and pyroxene)

(2) metamorphic; graphitic schist (graphite-chlorite-sericite schist); Depositional setting: platform-shelf; Metamorphic grade: amphibolite - upper
External host rock forms:schistose-gneissic metasediments
Host rock protoliths:graphitic shale-siltstone (contains quartz and muscovite; phyllosilicates and sphene formed during retrograde metamorphism ); Host rock protolith name: graphitic schist
Internal host rock structures:thin to and thick beds
Individual lithologies:graphitic metapelite (contains graphite, chlorite, sericite, quartz and sphene; phyllosilicates formed by retrograde alteration )

(3) metamorphic; migmatite (plagioclase, orthoclase, cordierite and garnet); Depositional setting: platform-shelf; Metamorphic grade: amphibolite - upper
Host rock protoliths:pelite and semipelite (formed by anatexis of metasediments during prograde metamorphism ); Host rock protolith name: unit of Wollaston Supergroup
Individual lithologies:pegmatite
anatectic gneiss

(4) surficial; laterite (eroded by glacier above the orebody); Host series: paleoregolith; Depositional setting: subaerial; Metamorphic grade: unmetamorphosed
External host rock forms:red hematitic upper zone grading to green zone bel
paleoregolith
Host rock protoliths:metasedimentary rocks (psammitic and pelitic gneisses and schists); Host rock protolith name: sub-Athabasca basement
Internal host rock structures:weathered fragile mass
Individual lithologies:laterite (variation in composition reflects protoliths except near paleosurface where lateritiztion is intense )

(5) sedimentary; sandstone-siltstone-conglomerate (eroded above the orebody); Depositional setting: fluviatile; Metamorphic grade: unmetamorphosed
External host rock forms:thick bedded
Host rock protoliths:arenite (diagenetically altered continental siliciclastic sediments at the base of 1.6 km thick Athabasca Group); Host rock protolith name: Manitou Falls Formation
Internal host rock structures:mainly medium-grained to granule; cross-bedded
Individual lithologies:quartz arenite (accessories: apatite, zircon, tourmaline, iron oxides; diagenetic minerals: kaolin, illite, chlorite and hematite/specularite )
Related igneous rocks: (1) intrusive; gabbro suite (syn- or post-mineralization); Initials: Mackenzie dyke swarm; Magma series: calc-alkaline
Individual lithologies:diabase (northwest-trending dykes intruded 1270 Ma ago, which is close to the time of initial uranium mineralization and early remobilization events )
Country rocks: (1) pelite-semipelite; (basal unit of metasediments); Country rock name: Wollaston Group; Metamorphic grade: amphibolite - upper
Country rock protoliths:graphitic shale-siltstone (unit drapes around granitic basement dome formed during Trans-Hudson orogeny); Country rock protolith name: unit of Lower Wollaston Group
Individual lithologies:schistose metapelite-metasiltstone (interbedded shale and siltstone sequence, includes graphitic beds)

(2) massive meta-arkose; (overlies pelite-semipelite unit); Country rock name: unit of Lower Wollaston Group ; Metamorphic grade: amphibolite - upper
Country rock protoliths:arkosic sandstone (deposited in tectonically stable shelf environment, probably shallow marine to sub-aerial); Country rock protolith name: unit of Lower Wollaston Group
Individual lithologies:quartzo-feldspathic gneiss (generally massive; folded during Hudsonian orogeny)

(3) calc-silicate; (beds in pelite & arkose units); Country rock name: unit of Lower Wollaston Group ; Metamorphic grade: amphibolite - upper
Country rock protoliths:carbonate (carbonate-rich beds and lenses in the pelitic and arkosic sediments); Country rock protolith name: part of lower units of Wollaston Group
Individual lithologies:calc-silicate (metamorphosed limestone, marl and calcareous clastic sediments)

(4) granitic gneisses; (reactivated Archean granites); Country rock name: basement of the Wollaston Group; Metamorphic grade: amphibolite (upper) - granulite
Country rock protoliths:granitic plutons (part of the Archean Hearne Province on which the Paleoproterozoic Wollaston Group was deposited); Country rock protolith name: remobilized Archean granites
Individual lithologies:granite gneiss (gneissic ganitoids; contain mainly quartz, pink K-feldspar and biotite)

(5) paleo-regolith; (up to 50 m thick weathering profile); Country rock name: sub-Athabasca regolith; Metamorphic grade: unmetamorphosed
Country rock protoliths:granitic gneisses & metasediments (nearly peneplaned basement exposed to lateritic weathering during the Paleoproterozoic); Country rock protolith name: sub-Athabasca basement
Individual lithologies:Lateritic (kaolinite-hematite rich; grades downward to illite-chlorite rich; pre-weathering textures preserved)

(6) conglomerate-sandstone; (eroded at Gaertner ore body); Country rock name: Manitou Falls Fm. / Athabasca Group; Metamorphic grade: unmetamorphosed
Metallogenic signatures: U-Ni-Co
Alteration signatures: chlorite alteration: dark green aggregates; What was altered: mafic silicates
sericite/muscovite alteration: micaceous minerals; What was altered: feldspars in host rocks
kaolinization: clay minerals, hematite coating, secondary silica; What was altered: feldspars in host rocks
silicification: quartz, replacive and open space fillings; What was altered: host rocks
hematization: hematite, limonite (goethite); What was altered: mafic silicates and magnetite
tourmalinization: tourmaline; What was altered: matrix in sandstone
saussuritization: partially or wholly altered feldspars; What was altered: feldspars
Mineralogy: (massive ore): uraninite, pitchblende - sooty, coffinite, gersdorffite, millerite, niccolite, rammelsbergite, bravoite, pyrite, galena, sphalerite, chalcopyrite, hematite, magnetite, limonite (goethite), quartz, chlorite - Fe-rich, calcite, siderite, sphene, kaolinite
Radiometric ages: Object dated: ore minerals; Age - Ma: 1,350; +4; -4; Dating method: U-Pb; Concentrate: pitchblende; Source rock: uranium ore; Formal name: initial/primary mineralization event; Event dated: orebody; Interpretive comment: these data from the Deilmann orebody applies to this orebody as they are close and on the same zone ; Reference: Trocki, L. K.; Curtis, D. B.; Gancarz, A. J.; Banar, J. C., 1984: Ages of Major Uranium Mineralization and Lead Loss in the Key Lake Uranium Deposit, Northern Saskatchewan, Canada; Economic Geology, Volume 79, p. 1378 - 1386

Object dated: Mineralogy(1); Age - Ma: 1,250; +34; -34; Dating method: U-Pb; Concentrate: uraninite; Source rock: uranium ore; Formal name: early/primary mineralization event; Event dated: orebody; Interpretive comment: a 3 point cord; lower intercept 262 ± 13 Ma; 3 samples from drill hole 47 in the Gaertner orebody ; Reference: Höhndorf, A.; Lenz, H.; von Pechmann, E.; Voultsidis, V.; Wendt, I., 1985: Radiometric Age Determinations on Samples of Key Lake Uranium 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. 48 - 53

Object dated: Mineralogy(1); Age - Ma: 1,232; +36; -36; Dating method: U-Pb; Concentrate: uraninite; Source rock: uranium ore; Formal name: early remobization event in ore; Event dated: orebody; Interpretive comment: a 3 point cord; lower intercept: 108 ± 12 Ma; 3 samples from drill hole H-2 (100 m from DDH 47); Reference: Höhndorf, A.; Lenz, H.; von Pechmann, E.; Voultsidis, V.; Wendt, I., 1985: Radiometric Age Determinations on Samples of Key Lake Uranium 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. 48 - 53

Object dated: Mineralogy(1); Age - Ma: 903; +40; -40; Dating method: U-Pb; Concentrate: uraninite; Source rock: uranium ore; Formal name: later remobilization event in ore; Event dated: orebody; Interpretive comment: a 3 point cord; lower intercept: 322 ± 38 Ma; 3 samples from drill hole H-14 (100 m from DDH H-2); Reference: Höhndorf, A.; Lenz, H.; von Pechmann, E.; Voultsidis, V.; Wendt, I., 1985: Radiometric Age Determinations on Samples of Key Lake Uranium 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. 48 - 53
Deposit shape: cigar-shaped
Deposit dimensions:length: 1,400 metre
width: 40 metre
thickness: 60 metre
Qualified comments: (Applies to: discovery and development) Unconformity Associated Uranium: Type 1 of SMDI; Discovery in 1978 of the Key Lake deposits associated with graphitic metasediments was the key to additional discoveries based on its model.

(Applies to: mineralization) Low temperature U-Ni mineralization formed initially as supergene enrichment in tectonic traps by weathering of basement rocks, and was later redistributed during diagenesis of the Athabasca Group.

(Applies to: discovery and development) 1981-1986; open pit; reserves in 1990: ~23 000 t U in 1.35 Mt ore grading 1.71 % U; total Reasonably Assured + Estimated Additional Resources at Key Lake: 70 000 t U in 3518 kt grading 1.99 % U. Dielmann open pit produced 47306 t U in 2.242 Mt ore grading 2.11 % U; high grade cobbles in till (eroded from zone between two pits and deposited to the SW) averaged ~ 2 % U and produced ~3000 t U.
Links to other databases: SMDI; Key value: 1130
References:
Bell, K., 1982
A Review of the Geochronology of the Precambrian of Saskatchewan-Some Clues to Uranium Mineralization
In Uranium 81, Edited by Simpson, P. R.; Plant, J. A.; Brown, G. C., Proceedings of a Meeting organized by the Applied Mineralogy and Geochemistry Groups, The Mineralogical Society, The Mineralogical Society, London, U.K., 216 p., p. 2 - 9

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

Clark, L. A.; Burrill, G. H. R., 1981
Unconformity-related Uranium deposits, Athabasca Area, Saskatchewan and East Alligator Rivers area, Northern Territory, Australia
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Collier, B.; Yeo, G., 2001
Stratigraphy of the Paleoproterozoic Manitou Falls B Member at the Deilmann Pit, Key Lake, Saskatchewan
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Cranstone, D. A.; Whillans, R. T., 1989
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Cumming, G. L.; Krstic, D., 1992
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Dahlkamp, F. J., 1978
Geologic Appraisal of the Key Lake U-Ni Deposits, Northern Saskatchewan
Economic Geology, Volume 73, p. 1430 - 1449

Dahlkamp, F. J., 1993
Uranium Ore Deposits
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Relationship between Uranium Mineralization and Some Major Crustal Features in Canada
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Dyck, W., 1978
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Hoeve, J., 1978
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Hoffman, P. F., 1990
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Production data: Report period: from 1995 until 1997; 0.15 million metric tons ore; Provisional entry?: yes; Yearly or summary?: S
Grade-commodity information:U: 2 percent
weight-commodity information:U: 3,000 metric ton
Reference: 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.
Percent weights allocated to deposit: 0.0%



Report period: from 1983 until 1986; 1.345 million metric tons ore; Provisional entry?: yes; Yearly or summary?: S
Grade-commodity information:U: 1.71 percent
weight-commodity information:U: 23,000 metric ton
Reference: 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
Percent weights allocated to deposit: 0.0%
Associated mine(s): Gaertner Open Pit / Key Lake Mine (40007)

Generated 2007-03-02 2:36:18 PM with GQuery -- 3.7 ADO (3.19/3.20/3.21 -- 2006-02-24)
GlobalDB System, Geological Survey of Canada, Natural Resources Canada