分期矿量范围对境界优化的影响
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摘要
以帮坡角及技术经济参数为依据,基于矿床数值模型,运用锥体排除法生成最大境界.根据在最大境界内产生的地质最优候选境界序列,设置5组不同分期矿量范围.通过对分期数、分期境界内的矿岩量、净现值及各分期跨度时间的对比,分析分期矿量范围对境界优化的影响.优化结果表明:分期矿量下限不变,上限增加,分期数减少,由9期开采转为8期开采;分期境界内采矿量、岩石剥离量的波动主要发生在前几个分期境界内.总净现值一直增加,但增加幅度逐渐减小.各分期时间跨度下限不变,上限逐渐增加.从总净现值及分期跨度时间来看,分期矿量范围在6～9年或6～10年更适于该矿山提高经济效益.
The cone elimination method was used to generate the maximum boundary based on established numerical model of ore deposits considering slope angle and technical economic parameters. On the basis of the geological optimum candidate boundary sequence produced in the maximum boundary,five groups of staging ore volume were set up. By comparing the staging number,the amount of ore and rock in staging boundary,the net present value and the time span of each stage,the influence of staging ore volume on boundary optimization was analyzed. The optimization results showed that the lower limit of the staging ore volume remains unchanged and the upper limit increases,the staging number decreases from 9 to 8. The fluctuation of the mining amount and the rock stripping amount in the staging boundary mainly occurs in the first few stages. The total net present value has been increasing,how ever the increase is gradually decreasing. The lower limit of the staging time span is unchanged,the upper limit is gradually increasing. According to the total net present value and the staging time span,staging ore volume in 6 ～ 9 a or 6 ～ 10 a is more suitable to improve economic efficiency.
The cone elimination method was used to generate the maximum boundary based on established numerical model of ore deposits considering slope angle and technical economic parameters. On the basis of the geological optimum candidate boundary sequence produced in the maximum boundary,five groups of staging ore volume were set up. By comparing the staging number,the amount of ore and rock in staging boundary,the net present value and the time span of each stage,the influence of staging ore volume on boundary optimization was analyzed. The optimization results showed that the lower limit of the staging ore volume remains unchanged and the upper limit increases,the staging number decreases from 9 to 8. The fluctuation of the mining amount and the rock stripping amount in the staging boundary mainly occurs in the first few stages. The total net present value has been increasing,how ever the increase is gradually decreasing. The lower limit of the staging time span is unchanged,the upper limit is gradually increasing. According to the total net present value and the staging time span,staging ore volume in 6 ～ 9 a or 6 ～ 10 a is more suitable to improve economic efficiency.
引文
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[2]Marino J M,Slama J P. Ore reserve evaluation and open pit planning[C]//Proceedings of Application of Computer Methods in the Miner Industry. Singapore,2013:139-144.
[3]Phillips D A. Optimum design of an open pit[C]//Proceedings of the 10th APCOM. New York,2012:145-147.
[4]Lerchs H,Grossmann I F. Optimum design of open pit mines[J]. Canadian Institute of Mining Bulletin,2015,23(4):47-54.
[5]Lipkewich M P,Borgran L. Two and three dimensional pit design optimization techniques[C]//A Decade of Digital Computing in the Mining Industry. New York,2009:1-7.
[6]Yegulalp T M. New development in ultimate pit limit problem solution methods[J]. Transaction of the Society for Mining,Metallurgy and Exploration,2013,294:1853-1857.
[7]Frimpong S,Asa E,Szymanski J. Intelligent modeling:advances in open pit mine design and optimization research[J]. International Journal of Surface Mining Reclamation and Environment,2002,16(2):134-143.
[8]Jalali S E,Ataee-Pour M,Shahriar K. Pit limits optimization using a stochastic process[J]. Canadian Institute of Mining Magazine,2016,1(6):90-94.
[9]Latorre E,Golosinski T S. Definition of economic limits taking into consideration time value of money[J]. CIM Journal,2011,2(3):162-170.
[10]王青,任凤玉,顾晓薇,等.采矿学[M].北京:冶金工业出版社,2011:74-76.(Wang Qing,Ren Feng-yu,Gu Xiao-wei,et al. Mining science[M]. Beijing:Metallurgical Industry Press,2011:74-76.)