By Topal, E.; Kuruppu, M. (Eds.)
ISBN-10: 1621981282
ISBN-13: 9781621981282
ISBN-10: 1847559166
ISBN-13: 9781847559166
The nineteenth overseas Symposium on Mine making plans and kit choice (MPES 2010) has been well-known as one of many best boards for selling overseas expertise move, with the focus on all facets of mine making plans, in addition to mining apparatus. those court cases from the nineteenth foreign Symposium on Mine making plans and gear choice hung on December 1-3, 2010 in Fremantle, Western Australia, include eighty papers. many of the subject matters coated within the lawsuits contain: advances in floor and underground mine making plans layout and desktop software; drilling, blasting and excavation engineering; environmental matters; automation; gear choice, usage and upkeep; feasibility case stories; future health and safeguard; mine making plans and block modeling; mining tools and making plans; mining procedure tracking and simulation; rock mechanics, geotechnical functions and mine surroundings and sustainable improvement.
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MINE PLANNING AND EQUIPMENT SELECTION (MPES) CONFERENCE / FREMANTLE, WA, 1 - 3 DECEMBER 2010 46 PRODUCTION CAPACITY OPTIMISATION IN THE PRESENCE OF GRADE UNCERTAINTY Coefficients N Mcbt Pcbsgt Xcbsgt Ycbsgt MC PC Ocbsg Gcbsg Qcb Scsg Bctmax number of grade realisations discounted cost of mining bench b in pushback c in period t discounted net revenue (revenue minus processing cost) of processing grade group g of grade realisation s within pushback c/bench b in period t discounted cost of stockpiling grade group g of grade realisation s within pushback c/bench b in period t discounted net revenue (revenue minus processing cost and reclaiming cost) of reclaiming from the stockpile and processing grade group g of grade realisation s within pushback c/ bench b in period t discounted cost of purchasing an additional unit of mining capacity discounted cost of purchasing an additional unit of processing capacity ore tonnage in grade group g of grade realisation s within pushback c in bench b average available grade in grade group g of grade realisation s of pushback c in bench b total tonnage of pushback c in bench b total recovered product in grade group g of grade realisation s of pushback c in bench b maximum number of benches to be completed within pushback c in period t Objective function The objective of the optimisation model is to maximise the average net present value (NPV) reported by each of the grade realisations (Equation 1).
Instead, if grade is higher than expected, surplus material is stockpiled. If grade is lower than expected, there will be a shortfall in the processing schedule (unless there is material on the stockpile for the grade realisation that can be drawn from at that time). There are several limitations to this type of scheduling approach. Progression of mining within a panel is not optimised or planned. Additionally, the panel sequencing constraints are applied strictly between time periods, but not within them.
The average NPV for this scenario is $238 million. This is a significant increase over the KM and KO results. Part of this increase is attributable to the greater variability in the grade realisations developed with conditional simulation, with generally higher grades over smaller volumes. In order to provide a fair comparison to the KM and KO cases, the KM and KO cases must also be reported against the same grade realisations (having previously been considered with the OK model). To do this the previously determined mining schedules and processing capacity are fixed and the optimisation is repeated using the same grade realisations.
Mine Planning and Equipment Selection - MPES 2010 by Topal, E.; Kuruppu, M. (Eds.)
by Christopher
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