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Shouwangfen copper mine pillar mining
Copper ore SHOUWANGFEN account hydrothermal contacting copper, iron, molybdenum metal deposit. It is lenticular and lenticular. The inclination angle is 70°～85°, the main ore body is 15~20m thick, and the small ore body is 3~5m thick. The taste is not high. The upper plate is dolomitic limestone and serpentine marble , and the lower plate is skarn, negative shale and granite . The ore and surrounding rock are very stable. At present, the mining method is used in the staged rock drilling stage, and the thickness of the mine is 30m as the boundary of the mine along the strike or vertical direction. The stage height is 60m. When the course is arranged along the strike, the length of the nugget is 60m, the width of the column is 12~14m, and the height of the bottom column is 13~15m. From the electric ramp, special diverticulum and section roadway, the BA-100 type down-the-hole drilling rig is used to cut the 110mm-diameter blast hole collapse pillar, and the intermediate column is used to advance the collapse column and the top bottom column. Timely returning to the mining column is an important feature and experience of the mine. Usually, the mine is returned to the mining column immediately after the mining. After that, the in-pulse mining is approved as the external sampling, and the mining design and construction of the mining pillar are combined. . For example, in the next five stages, the 841 mining house was just finished in 1986, and the adjacent 45 east side mining area is still recovering. In March 1987, a large explosive of 106t was used to recover 41 columns and 41 lines. The top and bottom columns between the 45 lines (Fig. 1) collected 273,000 tons of ore. The mining ratio is 4m/kt and the direct mining cost is 3.25 yuan/ton. The loss depletion is very low.
Figure 1 Pillar mining of the 841 mass in Shouwangfen Copper Mine
1—mine house; 2—mined area; 3—ore bed; 4—rock drilling chamber;
5—gun hole; 6—return airway; 7—sliding well; 8—lower four-stage roadway;
9—the next five-stage roadway; 10—the mining house that is recovering