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(2) This mining method workers can work directly under the large exposed surface of the mine.
(3) The shallow hole retention method is to stratify back to the mining room from the bottom up, using shallow hole collapse ore.
(4) Each time the ore collected is released from the funnel by the ore weight, leaving 2/3 ore as the temporary workbench for the next rock drilling and blasting work. When all the mines are mined, the remaining 2/3 of the ore is released (this is called a large amount of ore). The remaining ore cannot be used as the main means of ground pressure management.
(5) The rock driller is standing on the pile of mines for work.
Characteristics of shallow hole retention method in open field mining method
(1) It is a kind of empty field method and has the common characteristics of the empty field method. It is also a two-step mining process that divides the ore into a mine and a pillar. First mining room, rear mining column.