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
To recover the remainder coal in the side slope walls of surfacemine by use of underground coal winning method can increase coal recovery rate and mine economic effect.
采用地下台阶式开采法回采露天矿端帮煤可大大提高煤炭资源回收率和矿山经济效益；
3
Slope stability is the key factor of safety in production in surfacemine.