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The two- stage empty-field mining method should adopt large-diameter deep-hole mining; the mining site should use scraper or other equipment with large mining capacity. When using flat-bottom structure, it should be cleaned by remote-controlled scraper or other mechanical equipment. bottom;
3 When using horizontal deep hole falling ore, the space for cutting and pulling the bottom should be 30%~40% of the amount of caving ore . When using vertical deep hole lateral collapse, the cutting vertical trough should be placed in the mine. At the thickest part of the body, the width of the cutting vertical groove should be 20% of the thickness of the chipping strip ; when the large diameter is used to collapse the deep-hole spherical drug pack, the compensation space volume should be greater than 35% ;
4 When the stope is arranged along the strike and the vertical splitting collapses, the mine mining should be collapsed from the side to the cutting trough; when the stope is arranged in the vertical direction, the collapse should be pushed from the upper plate to the lower plate. 
What are the requirements for the use of the stage empty field mining method?
The 1st stage empty field mining method should be applied to the ore body shape regularization, steep inclined ore body with thickness greater than 10m and extremely thick ore body with any dip angle;