ASSESSMENT OF COSTS IN CUT-OFF GRADES OPTIMIZATION BY USING GRID SEARCH METHOD
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Tarih
2018
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Polska Akad Nauk, Polish Acad Sciences, Miner & Energy Econ Res Inst Pas
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The optimization of cut-off grades is a fundamental issue for metallic ore deposits. The cut-off grade is used to classify the material as ore or waste. Due to the time value of money, in order to achieve the maximum net present value, an optimum schedules of cut-off grades must be used. The depletion rate is the rate of depletion of a mineral deposit. Variable mining costs are to be applied to the really excavated material, as some of the depletion can be left in-situ. Due to access constraints, some of the blocks that have an average grade less than the determined cut-off grade are left in-situ, some of them are excavated and dumped as waste material. Naturally, variable mining costs should be applied to the blocks of a mineral deposit that are actually excavated. The probability density function of an exponential distribution is used to find the portion of the depletion rate over the production rate that is to be left in-situ. As a result, inverse probability densitv function is to be applied as the portion of the depletion rate over the production rate that is to be excavated and dumped. The parts of a mineral deposit that are excavated but w ill be dumped as waste material incur some additional cost of rehabilitation that is to be included in the algorithm of the cut-off grades optimization. This paper describes the general problem of cut-off grades optimization and outlines the further extension of the method including various depletion rates and variable rehabilitation cost. The author introduces the general background of the use of grid search in cut-off grades optimization by using various depletion rates and variable rehabilitation cost. The software developed in this subject is checked by means of a case study.
Açıklama
Anahtar Kelimeler
Cut-Off Grades, Optimization, Grid Search, Rehabilitation Cost, Depletion Rate
Kaynak
Gospodarka Surowcami Mineralnymi-Mineral Resources Management
WoS Q Değeri
Q4
Scopus Q Değeri
Q2
Cilt
34
Sayı
2
