Sensitivity analysis of mining block dimensions in production planning of open pit mines
Nowadays,open pit production planning is carried out based on a three dimensional block models; indeed,selection the block size for an ore body model is an exercise in compromises. Large blocks decrease the calculation time and also the variance of block estimation and selectivity,but cause much productivity and less operating cost. Smaller blocks increase the resolution of the model and selectivity which can be useful in planning but increase the variance of estimation in the individual blocks and also calculation time and decreases productivity and total NPV; furthermore,the cost of small blocks extraction is more than large blocks. Although different methods have been developed to long term production planning,no much has been discussed with regard to the impacts of variation of block dimensions on mine design and long term production planning. Block dimension is determine by a combination of parameters such as grade variability,geological continuity,equipment size,mining cost,dilution,slop stability and many other parameters. This paper aims to display the effect of different block dimensions on the long term production planning. For this reason,several block models with different block dimensions defined and economic model,ultimate pit and total net present value (NPV) in different block models were compared.This approach is tested using the data of Chadormalu iron ore mine of Iran.
A.Hekmat M.Osanloo B.Asi
Department of Mining and metallurgy,Amirkabir University of technology,Tehran,Iran Kavoshgaran Consulting Engineers (KCE),Tehran,Iran
国际会议
北京
英文
342-350
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）