超深开采 ultra-deep mining
深井开采 deep mining ; deep working ; deep well mining
深层开采 [油气] deep production
深部开采 [矿业] deep mining ; deep coal mining ; mining at great depth
深孔爆破开采法 blasthole method
深井开采技术 Technologies Required for Deep Mine
开采深 mining depth
分层台阶深孔开采 sublevel long hole benching
开采深度 mining depth
开采这些超深的油矿沉积层所需的钻探压力是开采海上石油正常压力的三倍。
These ultra-deep deposits must be drilled at up to three times the normal pressure for offshore oil.
它的开采始于1913年，是世界第二深的矿区。
It was opened in 1913, and is the second most deep in the world.
这个矿井与1960年开始出产铜矿。 铜矿的开采知识这里出现了一个深1.2米，宽4米，面积为7.7平方千米的深坑。
The mine has been in production since 1906, and has resulted in a pit over 1.2 km deep, 4 km wide, and covering 7.7 square kilometers.
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