The selection of dragline is a key problem to be handled when applying dragline for open cast in surface mining.
露天矿应用拉斗铲倒堆工艺的关键问题首先要做好拉斗铲的选型。
Mr Correa supports open-cast mining to raise public revenues, which he says would be spent on social programmes.
科雷亚支持露天采矿，想通过它来增加财政收入，并表示这些收入将被用来支援社会福利计划。
This task is a definite value of use for reference to improve equipment repair quality at Heidaigou Open Cast Coal Mine and reduce integrative repair cost.
本课题对于提高黑岱沟露天煤矿设备维修质量、降低综合维修成本具有一定的借鉴价值。
Limestone is usually mined in vast open-cast quarries, many of which will also carry out some processing of the materials.
石灰石通常在大型露天采石场开采，其中，许多还将进行一些材料的处理。
Guo: it seems that refilling the open-cast mining site with ground water seepage and making them a new lake system is one of the popular strategies here.
郭：似乎利用外溢的地下水将露天矿场改造成新的湖泊系统是这里很常见的策略之一。
Guo: it seems that refilling the open-cast mining site with ground water seepage and making them a new lake system is one of the popular strategies here.
郭：似乎利用外溢的地下水将露天矿场改造成新的湖泊系统是这里很常见的策略之一。
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