E - Fixed Constructions – 21 – C
Patent
E - Fixed Constructions
21
C
262/6
E21C 41/00 (2006.01) E21C 41/16 (2006.01)
Patent
CA 1044708
Inventor: Erik Igvar Janelid Title: Method for mining of rock or ore according to the block caving principle 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 several levels, principally straight, parallel and horizontal drifts into the lower part of a block, choosing the distance between the drifts at each level so that remaining supporting pillars will covers at least 40 % of the block area, undercutting the block from the drifts in such a way that the drift openings toward the undercut area and the drift coverings will be arranged in steps, the drift openings being utilized as draw-points for the caving material and the number of drift levels being chosen with regard to desired horizontal distance along the direction of the drift between the draw-points at adjacent levels.
233703
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