Uranium Deposit Report
Deposit : |
Bretagne (District) |
Country : |
France |
General Information |
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Geological District |
Bretagne | ||
Geological Region |
Massif Armoricain | ||
Political/Geographical Province |
Bretagne | ||
Last Data Update |
2009-01-01 | ||
Owner(s) |
SIMURA/COGEMA | ||
Operator |
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Technical Information |
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Tonnage Range (t U)
|
1,000 - 2,500 | ||
Grade Range (% U)
|
0.20 - 0.50 | ||
Deposit Status
|
Depleted | ||
Current Processing Plant
|
Ecarpiere (dismantled) | ||
Cumulative Production (t U)
|
1120 | ||
Production Period
|
1957-1984 | ||
Produced Grade (% U)
|
1 | ||
General Remarks |
There are 20 deposits which have been mined in the district : Kerler (146 t, 0.50%), Bonote (400 t, 0.61%), Vouedec (58 t, 0.36%), Keryacunff (40 t, 0.36%), Ty-Gallen (49 t, 0.26%), Le Hinguer (48 t, 0.48%), Moulin de Brodimon (20 t, 0.30%), Rosglas (114 t, 0.66%), Prat-Mérien (72 t, 0.14%), Sulliado (69 t, 0.46%), Quistiave (33 t), Calerden (28 t, 0.31%), ........ and Guern er Vilin (not mined, reserves of 200 t). | ||
Geological Information |
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Deposit Type |
Vein | ||
Geological Setting |
Mineralisations are located in the Bubry granite, part of the Pontivy pluton. Deposits are preferentially situated near the northern border of the leucogranite, along north-south faults. Three types have been recognised : - the most common are deposits associated to linear structures, as veins, with siliceous filling (Bonote, Vouedec, Kerler, Le Hinguer, ...... - some are associated to « episyenites » (Rosglass, Ty-Callen), - associated to micaschists lenses (Sulliado, Prat Mérien). Deposits are small (25-500 t), but the grade is generally good (0.3-0.6%) | ||
Age of Mineralization |
The main intragranitic vein-type deposits in Hercynian leucogranites were formed at the Stephanian-Permian transition (270-280 Ma), some 30-40 Ma after the emplacement of the granites. | ||
Mineralization |
Breccias are common Primary mineralisation : - geodic quartz with hematite, - pitchblende, - pyrite, chalcopyrite, Secondary mineralisation : gummites, autunite, chalcolite, uranocircite, renardite, uranotile alpha, sabugalite, covellite, limonite, | ||
MetallogenicAspects |
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Age of Mineralization |
The main intragranitic vein-type deposits in Hercynian leucogranites were formed at the Stephanian-Permian transition (270-280 Ma), some 30-40 Ma after the emplacement of the granites. | ||
DepositShape |
Bonote : steeply dipping parallel veins with one main structure | ||
DepositDimensions |
Bonote : 500 m extension, depth of 160 m, thickness 1-2 m | ||
GeologicalRemarks |
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Metallogenic Aspects |
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