Mining in Manitoba
Open Stope Mining
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Small ore bodies are often mined completely out, leaving no pillar of ore in place to support the walls of the stope. In some kinds of rock, it is possible to mine out huge stopes which stand open for years. Where some of the ore body is left in place as random pillars to support walls, the material is low-grade wherever possible because it may never be removed from the mine. Sometimes, after open stoping a mine, the pillars are "robbed" just before abandoning that portion of the mine, and the collapse of the stope walls is of no concern to the operation. |
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