Earthjustice, a nonprofit environmental law firm, is suing to block the lease of state-owned land in Otter Creek, Mont., to Arch Coal for mining to serve demand in Asia and elsewhere.
地球公正，一个非盈利的环保律师事务所，正在请求阻止租赁蒙大拿奥特·克里克的国有土地和劝阻阿奇煤炭公司开采煤矿用于满足亚洲和其它地区的需求。
According to the theory and method of particle flow code in two dimensions (PFC2D), the block caving law of natural caving mining method was investigated.
以自然崩落采矿法为研究对象，利用二维颗粒流数值模拟(PFC2D)的原理和方法，研究了自然崩落法矿体崩落规律。
Thus, different mining methods, different block structural parameter and different drawing way influence the stability of mining system.
因此，不同的采矿方法、不同的采场结构和回采方式，对地下采矿系统的稳定性都有着直接的影响。
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