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Gaspe copper mine column method
Gaspe Canada copper ore mine length 915m, width of 153 ~ 549m. The average thickness is 33.6 m. The upper part of the ore body has an inclination angle of 23° and the lower part is gentle. The roof is limestone and the bottom is shale . The mining method is divided into mines and pillars along the inclined direction of the ore body. The span of the mine is 15.3m. The length of the pillar is 21.4m, the width is 13.7m, and the spacing of the pillars is 15.3m. . The ore recovery rate is 75%. From top to bottom, it is divided into several sections for recovery. The height of the step is 12.2m, and the working face is fully sectioned (15.3×12.2m). The rock is drilled with two-arm mining rig (maximum working height: 15.3m), ammonium fry. Blasting, with a bucket capacity of 1.9m 3 downhole shovel or 2.1m 3 front loader with 30t car mining. Use a lift trolley to clean the roof and install the anchor. The anchor length is 1.52~2.13m, the mesh degree is 1.52×1.52m 2 , and the maximum control top distance is 4.9-5.5m. The shovel and front-end loaders have a production capacity of 1000t and 500t respectively. The electric shovel has a slow walking speed and it takes a long time to transfer the working place. It is only suitable for working in a large mining room with a large amount of mining. Since 1974, face loading has gradually replaced the downhole shovel with front-end loaders. The labor productivity of the mine face workers is 54 tons / work class, and the labor productivity of all mine workers is 35 tons / work class.