By Jean-Michel Rendu
An creation to Cut-off Grade Estimation examines probably the most vital calculations within the mining undefined. Cut-off grades are necessary to deciding upon the commercial feasibility and mine lifetime of a undertaking. elevated cut-off grades can lessen political dangers via making sure better monetary returns over a shorter time period. Conversely, reduce cut-off grades could raise venture existence with longer fiscal merits to shareowners, staff, and native groups. Cut-off grades additionally effect stated reserves, that are heavily monitored by means of inventory exchanges and regulatory firms.
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Extra resources for An Introduction to Cut-off Grade Estimation
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. All rights reserved. Electronic edition published 2009. 50 Head Grade, %Cu FIGURE 3-6 tail Relationship between recovery and average grade with constant The relationship between Uore(x), Uwaste(x), and average grade is shown in Figure 3-7.
43 g/t Grade, grams per metric ton FIGURE 3-1 Graphical estimation of cut-off grade between waste and leached material for material within pit limits © 2008 by the Society for Mining, Metallurgy, and Exploration. All rights reserved. Electronic edition published 2009. 20%Cu CUT-OFF GRADE FOR MATERIAL AT THE BOTTOM OF AN OPEN PIT MINE Now consider an open pit mine that is reaching the end of its life. Material is exposed at the bottom of the pit that need not be mined. Alternatively, this material could be mined and processed.
2008 by the Society for Mining, Metallurgy, and Exploration. All rights reserved. Electronic edition published 2009. CUT-OFF GRADE AND OPTIMIZATION OF PROCESSING PLANT 45 EXAMPLE: OPTIMIZATION OF GRINDING CIRCUIT IN A COPPER MINE The following example illustrates how plant capacity can be optimized when mine plans are fixed, no major change can be made to the processing plant, but plant capacity can be increased by changing grinding size. Mine production is fixed for at least one year, and the tonnage, grade, and metal content of copper-bearing material expected to be mined during this one-year period is as shown in Table 5-1 and illustrated in Figure 5-1.
An Introduction to Cut-off Grade Estimation by Jean-Michel Rendu