Recovering method for difficult mining block

Abstract

The invention discloses a recovering method for a difficult mining block. The method comprises the following steps: (1) digging an extra-vein roadway in the ore block footwall along the vein direction, and arranging a transverse drift roadway perpendicular to the vein direction; (2) drilling by a medium-length hole: digging a drilling rockhole in the extra-vein roadway, and expanding a drilling chamber after exposing the vein; (3) drilling a hole in the chamber by using a drilling machine, and arranging a shot hole by using bunch holes; (4) tunneling and constructing by using a smooth blastingtechnology; (5) simultaneously digging and supporting the roadway and the chamber, rapidly digging the roadway and the chamber, and rapidly supporting; (6) forming grooves at two sides of the ore block, and performing the induced caving; and (7) loading mined ores in a mine car by using a rock loading machine. The method is capable of recovering the difficult mining block by using a method of medium-length hole drilling and millisecond difference nonel blasting ore breaking, realizing the recovery of the difficult mining block, recovering the ore resources in the greatest degree, and improving the recovering efficiency. In addition, the method is safe and reliable, simple and easy to implement, and advanced in technology.

Description

technical field [0001] The invention belongs to the technical field of mining engineering, and in particular relates to a mining method for difficult-to-mining ore blocks. Background technique [0002] The Dajishan Tungsten Mine was discovered and mined in 1918, and formal mechanized mining began in 1958. It has a mining history of nearly a hundred years and is currently the largest quartz vein-type wolframite in the world. In 2004, the company was reorganized into Jiangxi Dajishan Tungsten Industry Co., Ltd., which is affiliated to Jiangxi Tungsten Industry Group Co., Ltd. The original design mining capacity of the mine is 812,000 t / year. The existing production scale is 750,000 t / year, the total annual mining volume is 350,000 t, and the annual output of tungsten concentrate is 3,080 t. The ore rocks are mainly Cambrian shallow metamorphic sandstone and slate interbedded, with a hardness coefficient of 8-10. The ore bodies are mainly steeply inclined and extremely thin ...

AI Technical Summary

Problems solved by technology

The original mining tunnel along the vein has collapsed in a large area during the excavation process. If the normal shallow mining method is used for mining, workers and equipment need to enter the mining area, which poses a great safety hazard