Mining

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 deciding upon the industrial feasibility and mine lifetime of a undertaking. elevated cut-off grades can decrease political hazards via making sure larger monetary returns over a shorter time period. Conversely, reduce cut-off grades may well bring up undertaking existence with longer monetary merits to shareowners, staff, and native groups. Cut-off grades additionally influence pronounced reserves, that are heavily monitored by way of inventory exchanges and regulatory enterprises.

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Electronic edition published 2009. 01362 The results obtained are plotted in Figure 5-5 and shown in Table 5-3. 0 (Figure 5-5). 22%Cu will reach this objective, © 2008 by the Society for Mining, Metallurgy, and Exploration. All rights reserved. Electronic edition published 2009. 50 CHAPTER FIVE Utility of Processing Specified Tonnage, millions $300 $290 $280 $270 $260 $250 $240 $230 $220 $210 $200 25 30 35 40 45 50 55 60 Tonnage of Mill Feed, million metric tons FIGURE 5-4 Relationship between utility U(T+c) and tonnage of mill feed T+c Change in Utility When One Metric Ton Is Added to Mill Feed, per metric ton $8 $6 $4 $2 $0 25 30 35 40 45 50 55 60 $(2) $(4) $(6) $(8) Tonnage of Mill Feed, million metric tons FIGURE 5-5 Relationship between incremental utility dU(T+c)/dT+c and tonnage of mill feed T+c © 2008 by the Society for Mining, Metallurgy, and Exploration.

Electronic edition published 2009. 32 CHAPTER THREE Constant Tail: Mathematical Formulation A model often used to represent the relationship between plant recovery and average grade of plant feed is the constant tail model. This model assumes that a fixed amount of metal cannot be recovered, whatever the grade of the material sent to the plant. 05 overhead cost per metric ton of waste Figure 3-6 illustrates the relationship between recovery r(x) and average grade x. 04 ⁄ ( 100x ) ] if x > c © 2008 by the Society for Mining, Metallurgy, and Exploration.

Electronic edition published 2009. CUT-OFF GRADE AND OPTIMIZATION OF PROCESSING PLANT 47 Alternatively, one could consider a decrease in cut-off grade. 344%Cu. 5 million metric tons. The higher-grade material could be sent to the mill and the lower-grade material could be stockpiled. But such an approach is likely to increase short-term costs without increasing revenues from concentrate sales. No advantage is taken of the higher copper price. Another option would consist of increasing mill throughput by increasing grind size.

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