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Example 2 of mining mining method
Huangshaping lead zinc ore was warmed to a high temperature fluid into the multiple fracture filling and replacement of lead and zinc metal deposits, ore mining industry have more than two hundred. The ore body has a length of 40-280 m, a thickness of 1 to 70 m, an average of 5 to 20 m, and a dip angle of 40 to 80 °. The ore body has a variety of shapes and complex shapes. The ore is generally more stable. Most of the upper plate is limestone, which is relatively stable, but the sand shale is not stable, and the lower disc dolomite and quartzite rock are stable.
The mine mainly adopts the dry filling method of the upper horizontally layered concrete partition wall. When the horizontal thickness of the ore body is less than 15~20m, the stope is arranged along the strike, the length of the mine is 30~50m; when it is larger than 15~20m, it is arranged vertically, and the width of the mine is 10~20m. The width of the column is 7~8m, and the height of the bottom column is 5~6m. If it is necessary to protect the transportation and ventilation of the upper stage, leave the 4m top column.
The method of mining the column is the same as that of the mine (see the figure below). After the column is pulled down, water is poured on the bottom column. 0.4 to 0.5 m thick reinforced concrete bottom plate, main rib ø12 ~ 18mm, secondary rib ø6 ~ 8mm, mesh degree is 200 × 250mm or 250 × 250mm. The bottom plate is embedded around the pillars by 0.5 to 0.7 m around the pillar. Rock drilling with the YSP-45 type up rock drill requires a concrete partition wall of 0.5m or more for the blast hole distance (filling the concrete partition wall with a thickness of 0.3m between the mine house and the inter-column). The layer height is 1.5 to 1.8 m, and a concrete backing plate of 0.2 to 0.3 m is poured on each layer of the filling material.
Schematic diagram of horizontally layered dry filling mining method in Huangshaping Mine
1—filling the roadway (through the vein); 2—the extra-vehicle transportation lane; 3—filling the well; 4—connecting the roadway;
5—Pedestrian patio; 6—Shunlu Patio; 7—Pengmai Transportation Laneway; 8—Concrete Partition Wall
The mine is discharged with 14kW or 30kW electric rafts, and each layer is immediately filled with waste rock, so that the partition wall is not exposed too high. Each layer is filled with 0.25 m thick concrete to facilitate the recovery of ore and reduce ore loss and depletion. The production capacity is 30t/d. The ore recovery rate is up to 95% and the depletion rate is about 15%.