By Jean-Michel Rendu
An creation to Cut-off Grade Estimation examines essentially the most vital calculations within the mining undefined. Cut-off grades are necessary to choosing the industrial feasibility and mine lifetime of a venture. elevated cut-off grades can lessen political hazards through making sure larger monetary returns over a shorter time period. Conversely, reduce cut-off grades may well raise undertaking existence with longer monetary advantages to shareowners, staff, and native groups. Cut-off grades additionally influence suggested reserves, that are heavily monitored through inventory exchanges and regulatory organisations.
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Extra info for An Introduction to Cut-off Grade Estimation
Electronic edition published 2009. 4 million metric tons of mill feed. 365%Cu. 4 million metric tons will be achieved by decreasing recovery from 95% to 92%. 98 per metric ton. © 2008 by the Society for Mining, Metallurgy, and Exploration. All rights reserved. Electronic edition published 2009. BLANK LEFT PAGE © 2008 by the Society for Mining, Metallurgy, and Exploration. All rights reserved. Electronic edition published 2009. CHAPTER SIX Cut-off Grade and Mine Planning—Open Pit and Underground Selective Mining There are many similarities between questions that must be answered when designing open pit and underground mines when selective methods are used.
CUT-OFF GRADE FOR POLYMETALLIC DEPOSITS 39 The utility of sending this metric ton of ore to the processing plant is U ore ( x 1, x 2 ) = NSR ( x 1, x 2 ) – ( M o + P o + O o ) Using NSR values greatly simplifies the calculation of cut-off grades. For example, the NSR cut-off between processing and wasting one metric ton of material of average grades x1, x2 is NSRc, calculated as follows: NSR c – ( M o + P o + O o ) = – ( M w + P w + O w ) NSR c = ( M o + P o + O o ) – ( M w + P w + O w ) In polymetallic deposits, cut-offs should not be expressed in terms of minimum metal grade; they should be expressed in terms of minimum NSR.
All rights reserved. Electronic edition published 2009. 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.