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St JoachimsthalJachymov District ÈSFR
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abundant Adams alteration amounts appear associated Athabasca Australia average basement Basin beds belt bodies breccia calcite Canada Canyon carbonaceous carbonate channel chlorite Class clay commonly complex concentrations conglomerate consists contain derived developed dikes distribution district dolomite early elements environment et al extensive facies faults fluids Formation fractures Geol geological gneiss grade granite groundwater Group hematite host host rocks hydrothermal intrusive Lake late later less lignite locally Lower major material Member metals metamorphic metasediments minerals Mines minor occur organic origin oxidation pipe pitchblende position precipitation present primary Principal processes production Proterozoic pyrite quartz range reduced References region River rocks sand sandstone schist sediments sericite shale solutions South stage structures Subtype sulfides Table thick tion unconformity units upper uraniferous uraninite uranium deposits uranium mineralization various veins volcanic wide zones