Practice on mining difficult orebody with block caving method at Fengshan Copper Mine

The ore body is to the east of the eleventh exploration line in the south edge ore zone of Fengshan Copper, the ore and the country rocks are very fragile. So the caving method without bottom pillar isn't be used. The ore recovery is about 20% on zero meter, but it is nearly zero in -10m and -20m level. After the caving block method was used, the mineral resource had been recovered. So the result is encouraging and satisfactory.