Optimal production scale of open pit mining operations with uncertain metal supply and long-term stockpiles
An open pit mining operation consists of various stages, and the calculation of the production capacities of these stages depends upon the available supply of ore (mineralized material of economic value) and waste material. Cutoff grade is the criterion that specifies the amount of ore and waste. Th...
| Main Authors: | , |
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| Format: | Journal Article |
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Pergamon
2012
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| Online Access: | http://hdl.handle.net/20.500.11937/28400 |
| _version_ | 1848752526009040896 |
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| author | Asad, Mohammad Waqar Dimitrakopoulos, R. |
| author_facet | Asad, Mohammad Waqar Dimitrakopoulos, R. |
| author_sort | Asad, Mohammad Waqar |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | An open pit mining operation consists of various stages, and the calculation of the production capacities of these stages depends upon the available supply of ore (mineralized material of economic value) and waste material. Cutoff grade is the criterion that specifies the amount of ore and waste. The material with grade equal to or higher than the cutoff grade is classified as ore. The material with grade less than the cutoff grade is considered waste. While this explains the link between cutoff grade theory and the calculation of production capacities, the majority of optimization models for finding production capacities not only disregards this relationship but also ignores expected variations and uncertainty in metal content or the available supply of ore and waste material. This work proposes an extension to an established theory of cutoff grade to determine the optimal production capacities using a stochastic framework relying on multiple realizations of the grade-tonnage curves. The proposed model (i) maximizes the net present value of cash flows over the life of an operation; (ii) offsets the initial investment in developing the constituent stages of an operation; and (iii) explores the impact of creating a long-term stockpile on the designed operational capacities. Applications to both a hypothetical and an actual copper deposit demonstrate the benefits of this model. |
| first_indexed | 2025-11-14T08:10:01Z |
| format | Journal Article |
| id | curtin-20.500.11937-28400 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:10:01Z |
| publishDate | 2012 |
| publisher | Pergamon |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-284002017-02-28T01:41:18Z Optimal production scale of open pit mining operations with uncertain metal supply and long-term stockpiles Asad, Mohammad Waqar Dimitrakopoulos, R. Net present value maximization Production capacities Optimization Cutoff grade An open pit mining operation consists of various stages, and the calculation of the production capacities of these stages depends upon the available supply of ore (mineralized material of economic value) and waste material. Cutoff grade is the criterion that specifies the amount of ore and waste. The material with grade equal to or higher than the cutoff grade is classified as ore. The material with grade less than the cutoff grade is considered waste. While this explains the link between cutoff grade theory and the calculation of production capacities, the majority of optimization models for finding production capacities not only disregards this relationship but also ignores expected variations and uncertainty in metal content or the available supply of ore and waste material. This work proposes an extension to an established theory of cutoff grade to determine the optimal production capacities using a stochastic framework relying on multiple realizations of the grade-tonnage curves. The proposed model (i) maximizes the net present value of cash flows over the life of an operation; (ii) offsets the initial investment in developing the constituent stages of an operation; and (iii) explores the impact of creating a long-term stockpile on the designed operational capacities. Applications to both a hypothetical and an actual copper deposit demonstrate the benefits of this model. 2012 Journal Article http://hdl.handle.net/20.500.11937/28400 Pergamon restricted |
| spellingShingle | Net present value maximization Production capacities Optimization Cutoff grade Asad, Mohammad Waqar Dimitrakopoulos, R. Optimal production scale of open pit mining operations with uncertain metal supply and long-term stockpiles |
| title | Optimal production scale of open pit mining operations with uncertain metal supply and long-term stockpiles |
| title_full | Optimal production scale of open pit mining operations with uncertain metal supply and long-term stockpiles |
| title_fullStr | Optimal production scale of open pit mining operations with uncertain metal supply and long-term stockpiles |
| title_full_unstemmed | Optimal production scale of open pit mining operations with uncertain metal supply and long-term stockpiles |
| title_short | Optimal production scale of open pit mining operations with uncertain metal supply and long-term stockpiles |
| title_sort | optimal production scale of open pit mining operations with uncertain metal supply and long-term stockpiles |
| topic | Net present value maximization Production capacities Optimization Cutoff grade |
| url | http://hdl.handle.net/20.500.11937/28400 |