Abstract

In the Bass Lake area, about 3 miles from the town of Cobalt, soda-rich aplites are developed in the upper part of the Nipissing diabase sheet. Associated with these aplites are the following metallic minerals: pyrite, skutterudite, glaucodot, gersdorfite, rammelsbergite, chalcopyrite, tenantite, niccolite, bismuthenite. The aplites, with the associated metallic minerals, are thought to be late-stage differentiates from the tholeiitic magma from which the diabase was formed and indicate that such a magma may yield minerals carrying Co, As, S, Ni, Ag, and Bi. The major mineralization of the Cobalt region is ascribed to a similar magma in depth.

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