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TitleLac Cinquante Uranium Deposit, western Churchill Province, Nunavut, Canada
AuthorBridge, N J; Banerjee, N R; Pehrsson, S; Fayek, M; Finnigan, C S; Ward, J; Berry, A
SourceExploration and Mining Geology vol. 21, 2013 p. 27-50
Alt SeriesEarth Sciences Sector, Contribution Series 20120302
File formatpdf
NTS55D; 55E; 55F/05; 55F/12; 55F/13; 55F/14; 55J/12; 55J/13; 55J/14; 55J/15; 55K; 55L; 55M; 55N; 55O; 55P/13; 56C/02; 56C/03; 56C/04; 56D/01; 56D/02; 56D/03; 56D/04; 56D/05; 56D/06; 56D/07; 56D/08; 65A; 65B; 65C; 65G; 65H; 65I; 65J; 65K; 65L/01; 65L/02; 65L/03; 68L/04; 65L/05; 65L/06; 65L/07; 65L/08; 65L/09; 65L/10; 65L/11; 65L/12; 65L/15; 65L/16; 65N/01; 65O/01; 65O/02; 65O/03; 65O/04; 65O/05; 65O/06; 65O/07; 65O/08; 65O/09; 65O/10; 65O/16; 65P; 66A/01; 66A/02; 66A/03; 66A/08
AreaLac Cinquante
Lat/Long WENS-102.0000 -90.0000 64.5000 60.0000
Subjectseconomic geology; geochemistry; structural geology; alteration; alteration products; mineral occurrences; mineral deposits; uranium; mineralization; geochemical analyses; greenstone belts; Archean; structural analyses; structural controls; Lac Cinquante Uranium Deposit
Illustrationsgeological sketch maps; location maps; photographs; photomicrographs; graphs; tables; diagrams
ProgramGEM: Geo-mapping for Energy and Minerals, Uranium
AbstractThe Lac Cinquante uranium deposit is located in the Hearne province of the Western Churchill Province, in the Kivalliq region of Nunavut. Lac Cinquante is hosted in a basement of Archean greenstones that are unconformably overlain by Proterozoic sediments. Three dominant styles of mineralization within the Archean greenstones has been documented by past studies including: disseminated pitchblende with base metals in tuffaceous metasediments, discrete pitchblende veins that cut across the metasediments, and quartz, carbonate, sulfides, and pitchblende in gash veins on 040 to 060 trending cross fractures. This study provides an overview of the mineralogy, geology, and geochemistry of the Lac Cinquante uranium deposit. In this study we present an updated regional scale geological map (1:5000) of the Lac Cinquante region that has been coupled with bulk rock geochemistry, mineralogy, and microprobe analyses in an attempt to understand the formation of the host rocks in the Lac Cinquante uranium deposit region. Additionally we compare and contrast the geology and geochemistry of the Lac Cinquante deposit with several other styles of uranium deposits in an attempt to classify the Lac Cinquante deposit. Lac Cinquante deposit is comparable to several unconformity deposits, but is best described as a basement hosted unconformity associated deposit, similar to the Eagle Point deposit of the Athabasca Basin.