At present, the technique of coal-bed methane surface mine and gas drainage was mature, so it was feasible for coal-bed methane development and utilization in Sichuan Province.

目前国内外煤层气地面开采技术、井下瓦斯抽放技术均已成熟，四川煤层气开发利用是可行的。

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On the basis of the case study of Anjialing surface coal mine, the trends in the development of shovel-truck technology have been analyzed.

最后在安家岭露天矿实例研究基础上，分析了该工艺在我国露天矿开发中的发展趋势。

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Marble karst development in Da-hong-shan mine caused a great deal of water bursting in mine shaft, sharply lowering ground water and large scale of surface subsidence.

大红山矿大理岩岩溶发育，由于突水造成井下大量涌水，同时引起地下水位急剧下降，引发了较大范围、较大规模的地面塌陷。

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