At present, China Jinling iron ore, the national iron ore, copper, silver-hui Copper Mountain ore mine in Hebei, China copper copper, iron ore and so the temple using this method. The characteristics of this method are: (1) A common feature of the open field method belonging to the empty field method is also the two-step mining, the first mining room, the rear mining column, and finally the empty space that has been cut as planned. (3) To open the trough - since the working face of this mining method is vertical, before the start of the mining work, in addition to the bottom and the leakage at the bottom of the mine, the cutting trough must be opened. The thin ore is made by cutting the vertical groove as the blasting free surface. (4) The ore that has fallen off is released from the bottom of the mine, (ie, staged mining, rather than sub-zonal mining, which is different from the Zambian subsection method mentioned earlier). As the work surface progresses, the goaf continues to expand. (5) There is no ore left in the mine, and it is kept in an empty field. The workers work in the small section roadway and do not enter the goaf, which is safer. Hot Blast Stove 2-Color Pyrometer Hot Blast Stove 2-Color Pyrometer,High Speed Pyrometer,Temperature Measuring Instruments,Non Contact Thermometer Changzhou Sijie Optoelectronics Technology Co.,Ltd. , https://www.sjinfrared.com
(2) This method is a mining method that divides the full height of the mine into several sections and drills the natural support of the thin ore in the section roadway. This is the method of making vertical vertical fan-shaped holes in the section roadway (the work surface is sturdy).
Overview of the mining method in the staged rock drilling stage
Sublevel Room drilling segment, it is segmented rock, stage a kind of ore mining method, widely applied in our country, according to 1971 statistics, the domestic ten kinds of major non-ferrous metal mines, the proportion of use It reached 16.27%, second only to the shallow hole retention method.