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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Cut-off grade determination for the maximum value of a small Wits-type gold mining operation
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Cut-off grade determination for the maximum value of a small Wits-type gold mining operation

机译：小型Wits型金矿开采活动的最大值的临界品位确定

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摘要

Work undertaken in the field of cut-off grade optimization has not advanced much beyond the work undertaken by Lane in 1988. His definitive work is based on the calculus of the Net Present Value criterion, which is the most widely understood, consistent, and appropriate method by which sequential cash flows arising from the extraction of mineral reserves from an exhaustible resource can be represented. Although the mathematics is not complex Lane's method is not a widely appreciated or applied approach to maximizing the value of a mining operation through selection and balancing of operational cut-off grades. Three stages in a mining operation, namely mining, processing and marketing were defined by Lane and the economics of each stage are identified and isolated to provide an optimum cut-off for each stage. Points of intersection along the present value curves for each stage of a mining operation are used to identify balancing cut-off grades at points where the capacity of the mining, processing and marketing stages is fully utilized and the Net Present Value of the operation is optimized. Data that simulate a small, deep-level Witwatersrand-type gold mine with an average grade of 6 g/t Au and a logrithmic variance of 1.2 are applied to the model to illustrate the benefits of representing cut-off grades in terms of present value curves for different segments of a mining operation.
机译：截止品位优化领域的工作并没有比Lane在1988年进行的工作进步很多。他的权威性工作基于净现值标准的演算，该标准是最广泛理解，一致和适当的。从可用资源中提取矿产储量产生的连续现金流量的方法。尽管数学并不复杂，但Lane的方法并未得到广泛认可或应用，它无法通过选择和平衡经营截止品位来最大化采矿作业的价值。莱恩定义了采矿操作的三个阶段，即采矿，加工和销售，并识别和隔离了每个阶段的经济性，以为每个阶段提供最佳的临界值。沿着采矿作业每个阶段的现值曲线的交点，用于识别在采矿，加工和销售阶段的能力得到充分利用且作业的净现值得到优化的点上的平衡临界品位。将模拟小型平均深度为6 g / t Au且对数方差为1.2的深深Witwatersrand型金矿的数据应用于该模型，以说明以现值表示截止品位的好处采矿作业不同部分的曲线。

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