General geology of the Kutcho Formation (north towards top), showing location of the three main sulfide lenses that comprise the Kutcho deposit. These lenses occur entirely within a sequence of rhyolitic pyroclastic strata. The hangingwall rhyolite passes upwards into mudstones with felsic volcaniclastic beds (tuff argillite on map). The latter unit is cut by a gabbroic sill-like body of uncertain age. Map courtesy of Homestake Canada.

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