自然崩落法放矿基本上都是在覆盖岩层下进行的。
The process of ore- drawing in block caving is completed under overburden.
微生物氧化的矿石、料和覆盖岩层会产生酸性岩排水。
Microbial oxidation of ores, tailings, and overburden contributes to ARD.
试验研究结果证实了自然分级现象是松散覆盖岩层客观存在的性质之一。
Test results confirmed that the classification phenomenon of natural grade was one of properties to determine where loose-covered rocks exist.
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