1970
Underground LHD loader at the face, miner in the cab.
The company
Cominco Ltd. operated a lead-zinc smelter at Trail, British Columbia, the Pinchi Lake mercury mine near Fort St. James, B.C., and gold production at the Con mine in Yellowknife.
Cominco Annual Report 1970, p. 16
That year
Refined zinc production at Trail was 222,000 tons in 1970, slightly below 1969 because weaker demand forced a production cut near year-end.
Cominco Annual Report 1970, p. 16