At present, the technique of coal-bed methane surfacemine 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。
2
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。
3
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.