The TMC claims occur within the Pacific Ranges to the north of the Pemberton-Squamish highway, in an area underlain mainly by Lower Cretaceous Gambier Group andesitic rocks of the Callaghan Creek roof pendant. Minor amounts of quartz diorite of the Jurassic to Tertiary Coast Plutonic Complex intrude the Gambier Group in the area of the showing.

Mineralization has only been recognised on the TMC 1 claim where unspecified copper, silver and zinc minerals occur in fractures 16 to 20 centimetres wide and with no apparent continuity.