Open Pit Mine Dewatering- Knob Lake

CIM Bulletin, 1965

J. B. Stubbins Formerly Engineering Superintendent; P. Munro Mine Engineering Supervisor Iron Ore Company of Canada, Schefferville, Quebec.

The purpose of this paper is to present the methods used in ground water control and the considerations that affected the development of these techniques. Production at Knob Lake is currently proceeding at depths which may be as much as 200 feet below the original standing water table. In order to produce a more saleable product and to improve operating and maintenance conditions, it is necessary to depress the water table below the mining level. Considerable success has been achieved by drilling deep wells in strategic locations and installing vertical turbine pumps at depths of up to 400 feet. This method is especially suitable for operation under severe winter conditions and has reduced the detrimental effects by a far greater extent than other methods of water control, Spring runoff is handled in open sumps, but all other water from four mines, with flows exceeding 16,000 g.p.m., is pumped all year 'round from about thirty-five wells.
Keywords: dewatering, ground water, Iron Ore Company of Canada, runoff, water table, Mine, Mines, Ore, Ores, Pump, Pumps, Water, Waters, Wells