露天矿经济合理剥采比确定方法的改进

目前露天矿经济合理剥采比是与并工开采成本对比计算得到的,计算时没有考虑井工开采的安全事故、地表沉陷等所造成的巨大经济损失,同时也没考虑露天开采对生态环境破坏和环境治理成本.本文综合考虑上述诸因素,并对露天开采和地下开采所引起的安全事故损失等进行了量化处理,利用概率统计法建立了由上述各因素所构成的成本计算模型,提出了:①浅部露天开采和深部井工开采的资源回收率差异较大；②露天与并工开采资源回收率相同；③浅部露天开采、深部暂不开采的矿床,三种条件下新的经济合理剥采比确定方法.以哈尔乌素露天煤矿为例进行了应用研究,确定其经济合理剥采比为10.06 m3/t,比传统方法所确定的剥采比增大0.06 m3/t,实践证明新结果更加合理.

Improve on Method to Determine Economic and Reasonable Stripping Ratio of Open Pit

At present, economic reasonable stripping ratio is confirmed by comparing underground mine cost. Cost of underground mining acci- dent,the earth＇s surface sinking and environment treat of surface mining are not considered. Basic on the lost of accidents in surface mining and underground mining are made digital. A new economic reasonable stripping ratio confirming method is put forward with above - mentioned costs involved ,which are calculated by cost model up built with probability and statistics. Three different conditions are studied in the new model：~） coal recovery ratios of surface mining and underground mining are different,with superficial and deep deposit both mined. （~）coal recovery ratios of surface mining and underground mining are equal, with superficial and deep deposit both mined. （~）superficial deposit is mined by surface mining, and deep deposit is not mined. As an example, the HAERWUSU surface coal mine is studied. It＇s educed that its e- conomic reasonable stripping ratio is 10.06 m3/t by the new method,0. 06 m3/t augmented compared with the primary method. The new method is proved to be more reasonable.