Mining in Manitoba |
Caving Methods |
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Caving methods should not be confused with subsidence. Subsidence implies that a failing hangingwall or roof is brought to rest, either on support or on the footwall, under sufficient control to ensure that there is little relative displacement within the subsiding mass. It may represent fracture zone development or it may be reflected in surface subsidence. Caving, on completion of the undercut, support is eliminated and the height of the undercut permits uncontrolled movement of ruptured blocks which destroys the structural identity of the original mass and permits passing it as caved material through drawpoints below the cave. Types of caving methods are :
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