Filling stope pillar recovery mining method
A mining method and bottom pillar technology, applied in the fields of backfill, ground mining, mining equipment, etc., can solve the problems of increasing the complexity of ore pillar mining, poor mining conditions, and ore pillar deformation, so as to reduce dilution and loss. , the effect of reducing insecurity and high-efficiency recycling
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[0022] 1. The height of the ore body is from the top of the stope to the bottom floor of the upper and middle stope, with an average height of 8.0 meters and an average width of 16 meters. Two bottom pillars are arranged perpendicular to the direction of the ore body, and each stope is 7 meters wide, with a 2-meter pillar in the middle.
[0023] 2. A cutting patio shall be constructed on the uppermost plate of each stope, with a size of 2.0×2.0 meters and a height of 8 meters to the bottom floor of the upper and middle stopes, as the free surface for the initial inclined ore drop.
[0024] 3. The 7655 air-leg rock drill is used, the rated air volume is 60l / s, the impact frequency is 35Hz, and the drill bit is a straight-line drill bit of Φ40mm.
[0025] 4. After forming the working plane, arrange the blasthole spacing of 1.2 meters, the minimum resistance line is 0.7 meters, each hole is charged with 11 rolls, continuous charging and blasting. The last row adopts smooth blast...
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