Uranium deposits of the Carswell structure

Laine, Roger T.
Organization: Canadian Institute of Mining, Metallurgy and Petroleum
Pages: 15
Publication Date: Jan 1, 1986
"The Carswell structure, located in the western part of the Athabasca Basin, northern Saskatchewan, has been extensively explored since 1967. This exploration has been successful and lead to the discovery, in 1970, of the D sandstone-hosted unconformity related deposit. By the end of 1984, five additional basement-hosted unconformity related deposits had been delineated: the OP and N discovered in 1970, the Claude in 1971, the Dominique-Peter in 1981, and the Dominique-Janine in 1984. The D deposit has been mined out; the Claude open-pit has already produced more than 500 tonnes of uranium, the development of the Dominique-Peter underground mine (first phase) has been completed, and production from the latter started in 1985.All six deposits are located in the southern part of the Aphebian metamorphic core, 18 km in diameter, which has intruded at least 1250 metres of Helikian Athabasca Group sediments during a cryptoexplosion event at 480 Ma, unrelated to the emplacement of uranium mineralization. The metamorphic rocks, affected by the Hudsonian Orogeny, are divided in two lithostratrigraphic units: the Peter River gneiss, aluminous gneiss series, and the Earl River complex, mixed quartzofeldspathic and mafic gneiss series. A well developed regolith profile is recognizable in the south along the contact with the sandstone and inside the metamorphic core sometimes associated with conformable sandstone beds.Basement and sandstone-hosted uranium deposits show many similarities:-linkage to unconformity;-mineralogy and geochronology with a first phase mineralization characterized by a polymetallic sulphide-uraninite-brannerite assemblage dated at 1150 to 1050 Ma, a second phase characterized by a simple sulphide-uraninite assemblage dated at 890 to 820 Ma, and a third phase characterized by a pitchblende-hematite dated at 380 Ma; and,-linkage to early Hudsonian structures with remobilization of these structures during intense hydrothermal alteration resulting in Mg chlorite-illite halos."
Full Article Download:
(2257 kb)

Additional chapters/articles from the CIM book CIM Special Volume 33

Uranium exploration in Canada
Huronian geology and the Blind River (Elliot Lake) uranium d
Uranium deposits South Limb of the Quirke syncline Elliot La
The Pronto Mine
Geology of the Agnew Lake Mine
Other conglomerate-hosted deposits
Uranium deposits* of the Bancroft area, Ontario
Geology of Madawaska Mines Limited, Bancroft, Ontario
Uranium in Early Proterozoic Aillik Group, Labrador
General geology and uranium deposits of the Beaverlodge Dist
Geology of the Beaverlodge operation Eldorado Nuclear Limite
The geology of the Cenex uranium deposit Beaverlodge, Saskat
Geology of the Athabasca Basin
The Geology of the Rabbit Lake urnnium deposit, Saskatchewan
Uranium deposits in the Rabbit Lake-Collins Bay area, Saskat
Uranium deposits of the Carswell structure
Geology of the Key Lake deposits
Geology of the Midwest uranium deposit northern Saskatchewan
Geology of the Dawn Lake uranium deposits northern Saskatche
The geology of the McClean uranium deposits, northern Saskat
The Cigar Lake uranium deposit: discovery and general charac
North Rim deposits Athabasca Basin
Geology and lithogeochemistry of the Maurice Bay uranium dep
The Gunnar uranium deposit
Uranium deposits and prospects of the Baker Lake Basin and s
Geology and exploration history of the Lone Gull property
Mountain Lake deposit, Northwest Territories
PEC uranium deposit Hornby Bay Basin, Northwest Territories
The Rexspar fluorite and uranium deposits
Basal type uranium deposits in south-central British Columbi