Luding copper mine mining room column method

Muding copper ore deposits containing copper Hao river sand sedimentary deposits. Wherein Ⅲ-1 ore based ore, accounting for 56.46% of the amount of metal ore, bedded output, angle 10 ° ~ 20 °, a thickness of 0.23 ~ 14.57m, the average thickness of 4.74m, copper ore grade 1.21%, silver 15.1g / t, ore are feldspar quartz sandstone, more robust. Followed by the III-2 and II-1 ore bodies.

Sections III-1 and III-2 with a thickness of about 3 to 5 m are selected by shallow hole chamber column method and medium-deep hole chamber column method, and the latter is applied when the roof is stable. The stage height is 15-20m, and the mining room is arranged vertically, with an oblique length of 36-60m. The mine is 10~12m wide and 1~3 mines are a panel. The band column is 3~5m wide. When using the shallow hole room column method, the rectangular rule of 3×4m and 3×6m is left in the panel. A pillar or a circular regular pillar of 3 to 4 m in diameter. The width of the top and bottom columns is 4 to 5 m.

Figure 1 shows the mining shallow hole back mining room and the medium-deep hole back to the mining column. Small mining houses are arranged in the inclined direction in the panel area and are picked up one by one from top to bottom. According to the stability of the roof, most of the pillars are recovered from the top to the top, leaving three 3×4m pillars and a small amount of rafts to support the goaf. The top and bottom columns are intended to be recovered after filling in the mine.

Figure 1 Deep hole mining column in shallow hole back mining room

A-mine mining recovery; b-mine mining; 1 - stopway; 2 - return airway;

3—Pedestrian wells; 4—Pedestrian walkways; 5—Intra-pulse uphill; 6—Recovery roadway;

7-55kW electric pick; 8-13kW electric pick; 9-iteral; 10-continuous pillar;

11—medium-deep hole; 12-55 kW electric raft; 13—left pillar; 14-raft

Figure 2 is a view of another shallow hole housing column arrangement and a return to the mining column. Sliding back to the mining room with a stepped working surface and leaving a round pillar of 4m diameter, the roof is slightly poorly supported by rafts or bolts. When the top plate is relatively stable and there is no large fault fracture zone, the circular ore column is extracted from the top of the mine with shallow hole blasting from top to bottom. When the width of the top column and the bottom column is less than 4~5m, it will not be recovered. When the top plate is more than 5m and the top plate is stable, the deep hole from the return airway and the upper mountain chisel will collapse into the empty mine and be electrically discharged.

Figure 2: Mining of the pillars under the stepped shallow hole room column method

A—mine mining recovery; b—mine mining; 1—filling tailings; 2—falling wells;

3—Along the vein roadway; 4—Return airway roadway; 5—Closed culture; 6—Uphill; 7—Electricity;

8—pan area pillar; 9—mine column; 10—medium depth hole; 11—the area pillar that is being recovered;

12—the remaining pillar; 13—the well