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白银露天矿早在十年前就已成为地表封闭圈以下采深达100米的深凹露天矿。目前最低水平距地表封闭圈188米。它是我国较早采用25、27吨自卸汽车运输、陡帮开采、
As early as ten years ago, the open-pit silver mine has become a deep open pit mine with a depth of 100 meters below the surface sealing ring. At present the lowest level of 188 meters from the surface closure ring. It is China’s earlier use of 25,27 tons of dump truck transport, steep to help mining,