Mine development system is not unchangeable.
矿井开拓系统不是一成不变的。
The slope-sliding of Union Valley Open Pit Mine began at the mine development stage.
团结沟露天矿从基建时起即开始滑坡。
The "double elevation" is a waterproof, anti-collapsing, safe and economical means of mine development recently suggested.
“双层水位”开采方法是近几年提出的防水、防塌、安全、经济的矿山开采方法。
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