METHOD FOR MINING OF ROCK OR ORE ACCORDING TO THE BLOCK CAVING PRINCIPLE IN MASSIVE FORMATIONS

摘要

Inventor: Erik Igvar JanelidTitle: Method for mining of rock or oreaccording to the block cavingprinciple in massive formations.Abstract:There is provided a method for extraction of rock or ore accord-ing to the block caving principle comprising driving, at severallevels, principally straight, parallel and horizontal drifts intothe lower part of a block, choosing the distance between thedrifts at each level so that remaining supporting pillars willcovers at least 40 % of the block area, undercutting the blockfrom the drifts in such a way that the drift openings toward theundercut area and the drift coverings will be arranged in steps,the drift openings being utilized as draw-points for the cavingmaterial and the number of drift levels being chosen with regardto desired horizontal distance along the direction of the driftbetween the draw-points at adjacent levels.