Stanleigh mine, Rio Algom's deepest at 4500 ft

Rio Algom's Stanleigh mine in Eliot Lake is being reopened and expanded. Operating levels are being developed at the 3700 and 3900 foot levels, with production from the 4100 foot level planned. A 30-year mine life is expected, with a seven-day milling capacity of 500 tpd. Mill startup will be July 1, 1983. Old workings are being isolated with airtight bulkheads to avoid ventilation and radioactive contamination problems. Thermoluminescent dosimeters are to be worn by all miners. Approximately one half of the $385 million investment will be in surface facilities, including water and tailings treatment facilities