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Abstract

The Ansil massive sulfide deposit is located 14 km north of the town of Rouyn-Noranda. The ore discovery was made in 1981 as a result of a long term program of deep diamond drilling initiated in 1974. Pre-production reserves, were 1 587 498 metric tonnes at 7.22% Cu, 0.94% Zn, 26.45 g/t Ag, 1.59 g/t Au. The deposit lies between 1180 and 1460 metres below surface.

Mining is done mainly by a long hole method and empty stapes are filled with waste and cement. This method is used to avoid leaving any ore pillar in place. Due to the high pressures at depth, rock mechanic studies have been a determinant factor in final stoping design. A cut and fill method will be used in the fringe of the ore body where tkickness is only a few metres and the dip is flat. Rate of production is 1 250 t per day on a 7 day-week basis. Muck is hoisted through a 5.5 metre diameter production shaft which was sunk to a depth of 1 500 metres. Another shaft, 4.0 metres in diameter was sunk to a depth of 1 347 metres for ventilation and services.

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