By Jean-Michel Rendu
An advent to Cut-off Grade Estimation examines essentially the most very important calculations within the mining undefined. Cut-off grades are necessary to picking the commercial feasibility and mine lifetime of a venture. elevated cut-off grades can lessen political dangers via making sure greater monetary returns over a shorter time period. Conversely, decrease cut-off grades may perhaps raise venture existence with longer financial merits to shareowners, staff, and native groups. Cut-off grades additionally influence pronounced reserves, that are heavily monitored by means of inventory exchanges and regulatory organisations.
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Extra resources for An Introduction to Cut-off Grade Estimation
All rights reserved. Electronic edition published 2009. 82 25 30 35 40 45 50 55 60 Tonnage Processed per Year, millions FIGURE 5-3 year Relationship between copper recovery and tonnage processed per It has also been determined that the relationship between copper recovery and mill throughput is as shown in Figure 5-3. 773 The function to be optimized is U ( T +c ) = Q +c ⋅ r ( T +c ) ⋅ V – T +c ⋅ P o ( T +c ) The relationship between U(T+c) and the cut-off grades (which defines T+c) is easily calculated using Table 5-1 and the two preceding equations.
26%Cu © 2008 by the Society for Mining, Metallurgy, and Exploration. All rights reserved. Electronic edition published 2009. 63 g/t Grade, grams per metric ton FIGURE 3-2 Graphical estimation of cut-off grade between waste and leached material for material at the bottom of the pit This mine cut-off grade separates material that can be left in situ from that which can be processed. 20%Cu mill cut-off grade calculated previously. CUT-OFF GRADES IN UNDERGROUND MINES Capacity constraints are common in underground mines.
Electronic edition published 2009. MINIMUM CUT-OFF GRADES 29 material may differ from those of freshly mined material, and the price of the product sold may be different from that prevailing when the decision to stockpile is made: U stp ( x ) = – ( M stp + P stp + O stp ) – NPV (future costs of stockpile maintenance) – NPV (future rehandling and processing costs) + NPV (future revenues from sales) Mstp = current mining costs per metric ton delivered to the low-grade stockpile Pstp = current costs of stockpiling material that will be processed later, including the cost per metric ton of extending the stockpile area if required Ostp = current overhead costs associated with mining and stockpiling NPV (future costs of stockpile maintenance) = net present value of yearly costs that will be incurred to maintain stockpiled material in an environmentally safe fashion until it is processed NPV (future rehandling and processing costs) = net present value of the one-time costs that will be incurred when the material is retrieved from the stockpile and processed NPV (future revenues from sales) = net present value of revenues expected from sales when processed material is sold.
An Introduction to Cut-off Grade Estimation by Jean-Michel Rendu