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为利于提高开采强度和减少初期的剥岩量,以改善经济收益,一些露天矿近期正通过不同途径来提高工作帮坡角。当工作帮的坡角加陡到20～40°时,通常即称为陡工作帮(参见附表)。但工作帮坡角绝非越大越好,加大到一定程度会使采剥成本增加,所以陡帮开采改善的经济效果和开采成本增加是互
In order to help improve the mining intensity and reduce the initial stripping of rock in order to improve the economic benefits, some open-pit mines have recently been using different ways to improve the working slope. When the work of helping the slope angle plus steep to 20 ~ 40 °, usually referred to as steep work to help (see Schedule). However, the work slope must not be as big as possible. If it is increased to a certain extent, the cost of mining and excavation will increase. Therefore, the economic results and the increase of mining costs resulting from the improvement of the steep mining are mutually