When mining a very small thickness of a fine vein, the mined area after the vein is taken is small because the thickness of the vein is small, and workers cannot work in it. If the surrounding rock is taken down, the depletion is too large, and the transportation and processing costs are increased, which is economically unreasonable. The essence is that in the working face, the ore and surrounding rock are separately mined, the ore is transported out, and the waste rock remains in the mine as a filling. In this case, a mining method or a wall-filling mining method can be applied. ) Characteristics of the wall-filling mining method: This method is continuous advancement of the working surface in the stage. Most of the nugget patios are the Chuanzhi Road patio. Since the ore body is very thin, there is no column left, sometimes a small bottom column is left, but sometimes the bottom column is not left, but an artificial bottom column (wood beam or concrete) is erected. When mining, first mining stones, then mining rocks. Before falling into the mine, lay a cushion on the filling material (paste belt or grass bag, spread steel plate, etc. 15 to 20 parts thick concrete), and use the artificial or rock to break down the ore with a 1.0 m deep blasthole. The electric raft is used to mine, and then the surrounding rock is filled to fill the goaf, forming the minimum space that the personnel can work. In this way, a piece of the nugget is finished. Rock Breaker Piston,Hydraulic Cylinder Gland,Plant Tractor Bucket Piston,Hydraulic Rock Breaker Piston MA AN SHAN GOLDEN STAR MACHINERY CO., LTD , https://www.gsdmachinery.com
Dry-filled mining method
The wall filling method is a type of dry filling method.