Strip mining

Strip mining(The ろ て it is the ぼ り),OreOne of the technique which mines. drift, in order to wind the eddy from the earth's surface, the underground aiming, the technique which it keeps digging. With quite primitive mining technique, local peopleDiamondAnd emerald and the like jewel was, but World War II, large-sized machine (Sigeki) with appearance Australia became possible.

The strip mining in Japan

If it is not the large-scale deposit, because profit does not take, almost it did not exist, but large sum by reaching the point where cost is required and the fact that etc. Sigeki's efficiency improves in safety measure in order to dig the drift, Hokkaido and the like small-scale coal.