This method consists in a variety of chambers where the mine blocks are generally cut by sub-levels from which long holes are drilled in plans that are generally parallel. These boreholes allow to blast the block by successive vertical break. The broken ore is mucked out by drawpoints or by longitudinal retreat. In order to prevent inbreak of the walls, large size deposits are often divided into many separate stopes by pillars. These pillars may be horizontal or vertical and are in certain cases, recuperated when all the ore has been extracted. Depending on the chosen method, empty stopes may be filled.


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