Overview of the empty field mining method (illustration)
1 Empty field method In the process of mining, it divides the ore into two parts: mining room and pillar. 2 When returning to the mining room, the stope exists as an open field. 3 It uses the stability of the pillars and surrounding rock mass to maintain the goaf. 4 After the mining house is finished, it is necessary to return to the mining column in time and timely process the gob area. (This is timely - refers to planned handling) In general, the return of the mining column to the goaf is carried out simultaneously. Sometimes in order to improve the mining conditions of the pillars, the mines are filled in advance and then returned to the mining column by other methods. 5 During the mining process, the stope mainly relies on the retained pillars or permanent pillars for natural support, sometimes supported by artificial pillars. (1) It is suitable for deposits where the ore and surrounding rock are stable. (2) The goaf is allowed to have a large exposed area within a certain period of time. Several methods currently used in the open field mining method are: (1) House column method (including comprehensive method) (2) shallow hole retention method (3) Segmentation method (4) Stage mining method (including various schemes for thin ore and horizontal thin ore) (5) Other mining methods and their deformation schemes
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Second, the applicable conditions of the empty field mining law
Third, the classification of empty field mining law