The Tanco Pegmatite, Southeastern Manitoba

CIM Bulletin, Vol. 72, No. 802, 1979

R.A. GROUSE Tantalum Mining Corporation of Canada, Ltd., P. CERNY, Department of Earth Sciences University of Manitoba, D.L TRUEMAN and R.O. BURT, Tantalum Mining Corporatin of Canada, Ltd., Bernic Lake, Manitoba

The Tanco pegmatite at Bernic Lake, in the Lac du Bonnet mining district of southeastern Manitoba, is a unique deposit of Li, Rb, Cs and Ta, with substantial reserves of Be and several industrial minerals. This paper summarizes the present state of understanding the regional geology, structural setting, zoning, mineralogy and geochemistry of the pegmatite, and the mining and ore-processing methods used in its exploitation.
Keywords: Pegmatites, Tanco pegmatite, Geology, Bernic Lake, Lithium, Rubidium, Cescium, Tantalium, Berylium, Bird River greenstone belt, Mineralogy