Optimization study on mining method of open-stope succeed by fill for steeply inclined and medium-large thick orebody
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Abstract
Wulan mine currently adopts the mining method of sublevel drilling and stage room stoping,facing the problems of goaf safety,surface subsidence damage and poor technical and economic indexes.Backfilling mining methods are comprehensively compared and optimized below 945m level.When ore body thickness > 15 m,the stopes are arranged vertically to the direction of orebody strike.The large diameter longhole mining method of stage open stoping with subsequent backfilling is selected in preference,and the two-step mining method as supplement of sublevel open-stope succeed by fill with mid-depth blasthole.When ore body thickness ≤ 15 m,the stopes are arranged along the direction of orebody strike.According to ore grade,the two-step mining method and barrier pillar reserved method are adopted respectively of sublevel open-stope succeed by fill with mid-depth blasthole.
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