Pillar mining method for gentle dip thin ores

Abstract

The invention discloses a pillar mining method for gentle dip thin ores. The method comprises the following steps: A, filling the goaf (except upward roadways on the studding side) among top pillars, bottom pillars and studding in an open-stope room-and-pillar method stope (in which stoping is finished) with cementing tailings to form a cemented filling mass; B, firstly stoping pillars in the goaf; then moving tailings and waste stone (dug in the process of stoping the first row of pillars) out of the stope and backfilling the goaf for stoping adjacent upper rows of pillars with tailings and waste stone (dug in the process of stoping other pillars); C, after pillars in the goaf are all stoped, filling the upper roadways and the goaf of pillars by one-time operation; D, after pillars and middle pillars in the whole middle section of the goaf are all stoped, remaining essential airways; for the sake of safety, transporting roadway frontals from the middle section, then going back for stoping top pillars and bottom pills according to a method of drift stroping with backfill, and carrying out alternative stoping and tightened filling. By virtue of the method disclosed by the invention, pillars reserved in the open-stope room-and-pillar method can be stoped safely and efficiently at low cost.

Description

technical field [0001] The invention belongs to the technical field of mining, and relates to a mining method for a gently inclined thin ore body ore pillar. Background technique [0002] The characteristic of mineral resources is non-renewable. With the continuous exploitation of mineral resources, geological reserves are decreasing year by year. In order to increase the recovery rate of mineral resources, it is necessary to recover the security pillars reserved in the original mining process. According to the current practice, the caving method is generally used to fill the goaf or the filling method is used to fill the goaf before the pillar is recovered. The disadvantage of caving filling the goaf is that it will cause certain damage to the surface or cause certain rock movement. [0003] The pillars reserved by the open-field room-and-pillar method, because the environment is a goaf, the roof stress is large, and the safety hazards of the pillar mining are great, so i...

AI Technical Summary

Problems solved by technology

The disadvantage of caving filling the goaf is that it will cause certain damage to the surface or cause certain rock movement

[0003] The pillars reserved by the open-field room-and-pillar method, because the environment is a goaf, the roof stress is large, and the safety hazards of the pillar mining are great, so it will be very difficult to implement mining with the ordinary filling mining method

Images