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露天开采具有劳动生产率高、损失贫化低、回采工艺简单、成本低等一系列优点。因此露天开采比例和规模有逐渐增大的趋势。我国有色金属露天开采矿石产量占总产量32%,黑色金属露天开采矿石产量占总产量90%。国外金属露天矿开采的比例一直较高。如铜矿露天开采比例90%,铁矿露天开采比例78%。美国97%的矿石由露天开采。我国特大型的有色金属矿床少。目前德兴
Open-pit mining has the advantages of high labor productivity, low depletion loss, simple mining technology and low cost. Therefore, the proportion and size of open-pit mining tends to increase gradually. China’s non-ferrous metal open-pit ore production accounts for 32% of the total output, black metal open-pit ore production accounts for 90% of the total output. The proportion of foreign metal open pit mining has been higher. Such as copper open-pit mining ratio of 90%, 78% of iron ore open-pit mining. 97% of the ore in the United States is mined in open fields. China’s large non-ferrous metal deposits less. Currently Dexing