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.
Figures & Tables
Control on Base Metal and Gold Mineralizations, Bousquet—Rouyn-Noranda Area*
The Archean Abitibi belt is one of the largest and most studied greenstone terranes in the world. This is due not only to its precious and base meta 1 production, but also to its excellent bedrock exposure which permits observation of many Archean geological features in the south part of the belt lying between Rouyn-Noranda and Val d'Or.
The main objective of the regional field trips and the mine visits is to present the rna in stratigraphic, st ructura 1 and ore characteristics of the southern part of the Abitibi Belt. This regional field trip is scheduled to cover the Rouyn-Noranda and Cadi 11 ac-Bousquet mining camps. Operating mines will also be visited: Francoeur, Pierre-Beauchemin, Ansil, Mobrun, Doyon and Bousquet. The delegates will be able to examine the main volcanic, plutonic and sedimentary rocks as well as the various structural features in this part of the Abitibi. Ore deposits will include both massive sulphide and gold deposits. The various geological and structural environments of these deposits will also be examined.
The southern part of the Abitibi Belt in Quebec is dominated by a prominent deformation corridor, the Cadillac-Larder Lake Fault Zone. This zone is oriented E-W and separates a volcanic domain in the north from an essentially sedimentary domain in the south. This sedimentary domain, comprising clastic rocks and various granitic complexes, belongs to the Pontiac Subprovince. The volcanic domain is composed of various “blocks” of volcanic assemblages intruded by granitic masses, separated from one another by fault zones, discordances and inear sedimentary units. On the regional scale, the imbricated volcanic “blocks” are lozenge-shaped, with E-W orientd long axes. In most cases, the relationships between these volcanic and sedimentary “blocks” remain ambiguous.