McClean Lake mine

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McClean Lake Mine
McClean Lake Mine is located in Saskatchewan
McClean Lake Mine
McClean Lake Mine
Location in Saskatchewan
Location Athabasca Basin
Province Saskatchewan
Country Canada
Coordinates 58°15′40″N 103°48′09″W / 58.26111°N 103.80250°W / 58.26111; -103.80250Coordinates: 58°15′40″N 103°48′09″W / 58.26111°N 103.80250°W / 58.26111; -103.80250
Products Uranium
Opened 1999
Company AREVA (70%), Denison Mines (22.5%), OURD Canada (7.5%)
Year of acquisition 1979 (Discovery)

The McClean Lake mine is a uranium mine and milling operation located west of Wollaston Lake, about 700 kilometres north of Saskatoon, in the Athabasca Basin region of Saskatchewan, Canada. The McClean ore body was discovered in 1979, followed by the discovery of the JEB ore body in 1982. From 1985 to 1990, a cluster of deposits named Sue A, Sue B and Sue C were discovered.

Production from the JEB and Sue C open pits commenced in 1999. Upon depletion, the JEB pit was converted to a Tailings Management Facility (TMF). The Sue C pit will be converted to a TMF for the disposal of waste from the McLean Lake and Cigar Lake operations. Production from the Sue A mine and development of the Sue E mine, commenced in mid-2005.

After the tailings from the milling operations and waste rock from the mining operations are chemically treated to precipitate arsenic and nickel they are pumped into the TMF. There they form a consolidated mass of much lower permeability than the surrounding sandstone. As a result the groundwater flow is diverted around the tailings. By these means the water quality in adjacent Fox and Pat Lakes is expected to be maintained within Saskatchewan Surface Water Quality Objectives over the long term (10,000 years). This expectation has to be confirmed by monitoring subject to oversight by the CNSC.

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