Based on the "surface mine long term planing model" the stepwise mining limit optimization model has been set up for inclined ore bed.
在倾斜矿床露天矿长远规划模型的基础上，建立了分期开采境界优化模型。
Dave Noonan, the national secretary of the Construction, Forestry, Mining and Energy Union, says Australia must limit the influx of foreign workers.
建筑、林业、矿产和能源联合会全国事务长戴夫·努南说，澳大利亚必须限制外国工人涌入。
However, the resource-bearing regions distribute uneven. The conditions of complex coal mining technology and biological environments limit the coal resource development of energy bases.
但是，我国煤炭资源地域分布不均衡，复杂的煤矿开采技术条件和生态环境制约着我国能源基地煤炭资源的开发。
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