sentences:  The plant consisted of a separation unit, a dehydrating unit and a refinery.The plant conducted successful tests using the Clark hot water process in 1948/49 then closed, partly because the recent Leduc discoveries had lessened interest in the oil sands.In 1962, Great Canadian Oil Sands Limited (GCOS) received approval from the Alberta government to build and operate a 10,000 cubic metre per day plant near Fort McMurray.