析地下转露天开采适用的资源条件

基于露天开采具有的优势,分析了地下转露天开采适用的资源条件。与地下开采相比,露天开采具有资源回收率高,生产能力大,成本低,作业安全,环境好等优势。资源回采率要求、安全条件要求、经济效益要求和资源复采是实施地下转露天开采的原因;其中产量规模扩大、露天开采成本降低、矿石价格提高和边界品位下降带来的剥采比降低是促使地下转露天开采经济效益提升的主要原因;而采用露天方式对已经开采过的资源进行复采可充分回收地下开采剩余的资源价值,主要包括矿柱回收、充填物回采和破坏资源的露天开发3种形式。

Analysis of the Conditions of Resource Adapt to Transferring from Underground into Open Pit Mining

Based on the dominance of open pit mining，the conditions of resources which adapt to transferring from underground into open pit mining are analyzed.Comparing with the underground mining，open pit mining owns the advantages of high recovery ratio of resource，large production capacity，low production cost，high operation safety level，well operation environment，and so on.The factors of resource recovery ratio，operation safety，and economic benefits and the secondary recovery of resources are the reason for transferring from underground into open pit mining.Among these，the enlargement of production capacity，the decrease of production cost in open pit，the increase of ore price，and lower stripping ratio which brought by lower cutoff grade are the main one of transferring from underground into open pit mining to increase economic benefits.The secondary recovery from the residual minerals with open pit mining can fully make use of mineral resources which are lost by underground mining.There are three mining forms，mainly including of ore pillars recovery，filling recovery，and open pit mining which destroyed the minerals.