The basic principle, major controlled process condition, mining process and its characteristics of selective leaching are analyzed. It is a clean mining process of high efficiency.
本文分析了选择性溶浸法开采钾盐矿的基本原理、主要控制的工艺条件、开采工艺流程及其特点，它是一种清洁、高效的开采工艺。
It's the carbon-energy footprint, destructive mining, diminishing supplies of clean water and exploitative labor practices -- all of which are now threatening Meghalaya, by the way.
顺便说一下，是碳足迹、破坏性的矿产开采，清洁水供给的减少以及劳工剥削行径——是这一切在威胁着梅加拉亚。
UCG is promoted as a relatively clean method of exploiting coal seams that are too deep or thin to be tapped economically using conventional mining.
相对于传统的采矿技术来说，煤炭地下气化技术在开采过深或过浅煤层时更为适用，这种技术不仅开采成本较低，而且开采过程较为清洁。
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