Abstract
The main “black ore” body of the Takara mine is massive and crumbly, so cross cut caving method has been used. Seven sublevels were driven in the wall rocks around the ore body at about 10 meters intervals vertically. From each level cross cuts were driven radially to the ore body at about 10 meters intervals horizontally. Then the mining drifts of 6-7ft. wide and 7-8ft. high with timber and laggings on the roof and sides were driven from the crosscuts to mine the ore. When the crosscut mining is completed the ore above isallowed to cave-in for the next crosscutting.Steel supports are recently used in a fewstopes, in place of timbers. In other small lenticular ore bodies shrinkage and square-set methods are used.In recently developed new ore body waste filling method will be used.
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