一,概述 和坑采相比较,矿床的露天开采具有以下优点: 1、由于可以利用高效的挖掘和运输设备,因而可以显著地提高劳动生产率并缩短矿床开采的准备期限; 2、露天开采的成本要低得多; 3、可以更便宜地回收早期坑采时残留的矿石,其中包括氧化矿; 4、在块状硫化矿床的开采中,可以避免矿井火灾的发生; I. OVERVIEW Compared with pit mining, the open pit mining has the following advantages: 1. It can significantly improve labor productivity and shorten the preparation period of ore deposits because it can utilize efficient excavation and transportation equipment. 2. The cost of open pit mining Much lower; 3. It is cheaper to recover the residual ore during the early pit mining, including the oxide ore; 4. It is possible to avoid the occurrence of mine fire in the mining of massive sulphide ore deposits;