Uranium Deposit Report
Deposit : |
Deilmann |
Country : |
Canada |
General Information |
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Geological District |
East Athabasca (Key Lake) | ||
Geological Region |
Athabasca | ||
Political/Geographical Province |
Saskatchewan | ||
Last Data Update |
2009-01-01 | ||
Owner(s) |
20 %, Idemitsu | ||
Operator |
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Synonym Name(s) |
Key Lake | ||
Technical Information |
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Tonnage Range (t U)
|
25,000 - 50,000 | ||
Grade Range (% U)
|
1.00 - 5.00 | ||
Deposit Status
|
Depleted | ||
Current Processing Plant
|
Key Lake | ||
Cumulative Production (t U)
|
73900 | ||
Production Period
|
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Produced Grade (% U)
|
0 | ||
General Remarks |
Deilmann and Gaertner are the Key Lake orebodies | ||
Geological Information |
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Deposit Type |
Unconformity-Proterozoic Fracture-bound | ||
Geological Setting |
Regional - Undeformed intracratonic sedimentary basin unconformably overlying polyphase deformed Wollaston Group paragneiss and Archean orthogneiss domes metamorphosed to upper amphibolite facies during the Trans Hudson orogen. Hostrocks - Lower Wollaston Group graphitic pelite and cordierite gneiss and unconformably overlying Manitou Falls B orthoquartzite and conglomerate | ||
Age of Mineralization |
1350+/-4 Ma (U-Pb pitchblende) - reset age? | ||
Mineralization |
Description - massive pitchblende and Ni-sulphides and arsenides straddling the unconformity (basement and sandstone), veining and disseminated pitchblende in basement. Mineralogy - massive uraninite and pitchblende, coffinite, gersdorffite, millerite, niccolite, rammelsbergite, bravoite, pyrite, galena, sphalerite, chalcopyrite Alteration - chlorite and sericite alteration of mafics and feldspars of basement rocks, kaolinitization and dravitization of basement feldspars and sandstone matrix above unconformity, hematization of mafic silicates in basement and along unconformity | ||
MetallogenicAspects |
Ore controls - regolith zone at the subhorizontal, subAthabasca unconformity at the intersection with the post-Athabasca reactivated graphitic Key Lake basement fault | ||
Age of Mineralization |
1350+/-4 Ma (U-Pb pitchblende) - reset age? | ||
DepositShape |
cigar shaped | ||
DepositDimensions |
1000 m x 40 m x 40 m | ||
GeologicalRemarks |
Classic Athabasca unconformity deposit with polymetallic signature (U approx equal to Ni), with U, Ni, As, Pb, Zn, Cu. Strong kaolinite-dravite alteration signature | ||
Metallogenic Aspects |
Ore controls - regolith zone at the subhorizontal, subAthabasca unconformity at the intersection with the post-Athabasca reactivated graphitic Key Lake basement fault | ||