The 1- stage forced caving mining method should be applied to steeply thick ore bodies with moderately stable or stable rocks, small ore bodies with little change in shape or shape, or extremely thick ore bodies of any dip angle;
2 When the two stages are simultaneously harvested, the upper stage should be advanced, and the advanced distance should not be less than the length of one stop; when mining extremely thick ore bodies, the adjacent adjacent stope should be stepped forward;
3 Forced to collapse the top plate or retain the ore as a cushion, the thickness of the cushion shall not be less than 20m ;
4 The compensation space coefficient of extrusion blasting should be 15 %~ 20 %; the compensation coefficient of small compensation space should be 20 %~ 25 %; the compensation coefficient of free space blasting should be more than 25 %.
2 When the two stages are simultaneously harvested, the upper stage should be advanced, and the advanced distance should not be less than the length of one stop; when mining extremely thick ore bodies, the adjacent adjacent stope should be stepped forward;
3 Forced to collapse the top plate or retain the ore as a cushion, the thickness of the cushion shall not be less than 20m ;
4 The compensation space coefficient of extrusion blasting should be 15 %~ 20 %; the compensation coefficient of small compensation space should be 20 %~ 25 %; the compensation coefficient of free space blasting should be more than 25 %.
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