A program of geochemical prospecting was carried out in the summer of 1952 near Cobalt, Ontario. The area in which this work was done lies in the Precambrian shield of Canada, about 320 miles north of Toronto. Much of the area is covered by glacial deposits. The known ore bodies are predominantly thin veins of silver, and nickel and cobalt arsenides found as mesothermal fissure fillings in vertical faults and joints of the area. The cobalt concentration in samples of glacial material, collected on a horizontal and vertical grid over an area of proven mineralization at depth, was determined in order to test the applicability of geochemical prospecting techniques in locating ore bodies in similar situations. A cobalt anomaly in the overburden was located; subsequent drilling proved up mineralization in non-commercial quantities in the bedrock. It is concluded that the present technique is applicable in locating ore bodies where mineralization extends to the bedrock surface in geologic settings similar to those in the Cobalt, Ontario district.

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