The conventional mining causes the mining subsidence and at the some time a refuse heap arises on the ground.

常规开采在地面堆积矸石山的同时引起开采沉陷。

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Conventional mining mode is very hard to acquire the economic level, so hydraulic fracturing technology must be done.

常规开采方式很难取得经济产能，必须进行压裂改造。

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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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This gives it an edge over conventional mining companies as it does not incur any operational losses in volatile market conditions.

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Potash is a soft rock, which is extracted from sedimentary sea beds formed by evaporation of ancient seas, which is mined via conventional shaft mining like gold and silver.

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Pattern analysis the heart of data mining is conventional crime-solving, whether the suspicious patterns are spotted on a crime pin map, on a city street, or in an electronic database.

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