An Introduction to Cut-off Grade Estimation by Jean-Michel Rendu

By Jean-Michel Rendu

An advent to Cut-off Grade Estimation examines some of the most vital calculations within the mining undefined. Cut-off grades are necessary to opting for the commercial feasibility and mine lifetime of a undertaking. elevated cut-off grades can decrease political dangers by means of making sure greater monetary returns over a shorter time period. Conversely, reduce cut-off grades may well elevate venture lifestyles with longer fiscal merits to shareowners, staff, and native groups. Cut-off grades additionally impression stated reserves, that are heavily monitored by means of inventory exchanges and regulatory enterprises.

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MINIMUM CUT-OFF GRADES 23 In this formula, mining, processing, and overhead costs that apply to material remaining at the bottom of the pit may be higher or lower than those prevailing when the mine was at full capacity. This cut-off grade is sometimes called breakeven cut-off grade or mine cut-off grade. 00, respectively. 00 per ounce deduction must be made for shipping, refining, and other charges. 63 gram/metric ton The utility of sending material to the leach pad Uore(x) and that of leaving the material at the bottom of the pit are plotted on Figure 3-2 as a function of the grade x.

421 thousand metric tons Cu 180 179 177 174 172 168 165 162 159 155 150 146 141 136 131 125 119 © 2008 by the Society for Mining, Metallurgy, and Exploration. All rights reserved. Electronic edition published 2009. 32 Tonnage and Metal Content Above Cut-off 200 Cut-off Grade, %Cu FIGURE 5-1 year Graphical representation of grade–tonnage relationship for coming pounds of copper. 24 = $108 million Because of an unexpected increase in copper price, the mining company is investigating whether short-term changes could be made to mill feed and throughput, which would result in increased utility.

The decision whether one metric ton of material should be wasted or sent to the processing plant can no longer be made on the basis of grade alone. Dollar values must be calculated for each possible process, and the cut-off between ore and waste must be expressed in dollar terms. GENERAL CONSIDERATIONS Consider a metric ton of material that contains two valuable metals, copper and gold. Let x1 and x2 be the copper and gold grades, respectively. The processing plant consists of crushing, grinding, and flotation circuits.

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