contiguous thin coal seams mining 近距离薄煤层开采
The upper member of Taiyuan Formation in Baiping minefield is composed of three limestone layers(L7, L8 and L9), mudstone and thin coal seams.
白坪井田太原组上段主要由三层灰岩（L7、L8、L9）、泥岩和薄煤层组成，L7灰岩位于该段底部，是一7煤层顶板。
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。
Mountaintop mining involves a highly destructive practice of blasting through hundreds of feet of mountaintop to get at thin but valuable seams of coal
山顶采矿包括炸毁数十米山顶，获取稀薄而珍贵煤层的行动，具有极高的破坏性。
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