Filling mining method of gently inclined thin mineral deposit with soft roof

Abstract

The invention relates to a filling mining method of a gently inclined thin mineral deposit with a soft roof. The technical scheme of the invention is as follows: the filling mining method comprises the steps of firstly dividing the mineral deposit into panels, dividing the panels into strips, arranging preliminary mining and cutting laneways; then getting rid of soft roofs (5) and mining bodies (4) of the mined strips by blasting: and then filling: filling an empty area formed after mining the strip N-2 with waste rocks produced by getting rid of the soft roofs (5) of the strips N and N+1 by grouting, with the filling width being half of the width of the strips, when filling the strip N-2 with the waste rocks by grouting for 10-20m, starting to fill an empty area formed after mining the strip N-3 and the other half of an empty area formed after mining the strip N-4 with one half filled with the waste rocks by grouting with tailings, and enabling the tailing filling to lag behind the waste rock filling by grouting for 10-20m in the filling process, wherein N=2k+1, and k is an integer which is greater than or equal to 2. The filling mining method can improve the production capacity simultaneously while ensuring the stope operation safety and protecting the ground surface environment, and has the advantages of high recovery ratio, and low dilution rate, boulder yield and cost.

Description

technical field [0001] The invention belongs to the technical field of ore deposit filling and mining. In particular, it relates to a filling mining method for a thin ore deposit with a gently inclined soft roof. Background technique [0002] There are a large number of gently inclined thin deposits, and the stability of the surrounding rocks near the ore is poor. In particular, there is often a soft broken layer in the contact zone between the ore body and the roof, forming a typical gently inclined soft roof thin deposit. The direct roof is prone to collapse due to blasting disturbance or stress concentration, which not only leads to a large increase in the dilution rate, but also brings huge safety hazards to the workers and equipment in the mining area. [0003] For gently inclined thin deposits, the room and pillar method has been the main mining method. The outstanding disadvantage of the conventional room-and-pillar method is that it is difficult to recover the ore ...

AI Technical Summary

Problems solved by technology

The mining sequence is to mine the pillar first, then go back to the mining house after the goaf is cemented and filled, and the goaf of the mine house is filled with tailings, so that the ore recovery rate is improved and the surface deformation is controlled, but the mining cost and stope management complexity also increased accordingly

[0004] For the treatment of the broken roof, the methods adopted at home and abroad are to strengthen the support and improve the integrity of the roof. The support and maintenance are not only difficult, but also costly; for the broken roof is prone to large-scale caving due to blasting disturbance, Due to the high dilution rate caused by the mixed ore, some mines adopt the method of reserving a certain thickness to isolate the roof protection layer to reduce the mixing of waste rock, but this also causes a large amount of ore loss, which is not suitable for thinner deposits. mining

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