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黑龙江省依兰第二煤矿应用悬移支架放顶煤法 ,回采中采取了防沼气、防火、防倒架安全措施 ,吨煤成本较分层开采降低 14元 ,回采率达到 85 %。
Heilongjiang Yilan No. 2 Coal Mine uses hanging bracket top coal caving method. In the mining, anti-marsh gas, fire prevention and anti-down frame safety measures are adopted. The cost per ton of coal is 14 yuan lower than that of stratified mining, and the recovery rate reaches 85%.