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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Don Blankenship, CEO, Massey energy: "Most coal mined by surface mining cannot be deep mined... energy resources would be lost if not surface mined... our company is an energy company," he added.

Massey Energy的首席执行官Don Blankenship表示：“采用地表采矿，大多数煤炭不能深采…不采用地表采矿，会造成能源损失…我们公司是能源公司。”

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Mining in deep mine generally refers to the mining technology apoted for mining the specific depth coal that is apart from surface.

深矿井开采一般是指为开采距地表特定深度的煤炭而采取的开采技术。

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There is no free lunch whether with coal mining or deep-water drilling, or for those who are honest, in the enormous underlying mining and chemical infrastructure needed to build vast arrays of wind and solar farms.

FORBES: Post Fukushima-- burn more coal and oil, and hire more engineers not regulators