By Jean-Michel Rendu
An advent to Cut-off Grade Estimation examines essentially the most vital calculations within the mining undefined. Cut-off grades are necessary to picking the commercial feasibility and mine lifetime of a undertaking. elevated cut-off grades can decrease political dangers by means of making sure larger monetary returns over a shorter time period. Conversely, decrease cut-off grades might raise undertaking existence with longer monetary advantages to shareowners, staff, and native groups. Cut-off grades additionally impression mentioned reserves, that are heavily monitored through inventory exchanges and regulatory corporations.
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Extra resources for An Introduction to Cut-off Grade Estimation
Example text
For many processes and deposits, the recovery r is a function r(x) of the head grade x. The value of Uore(x) must then be written as follows: U ore ( x ) = x ⋅ r ( x ) ⋅ ( V – R ) – ( M o + P o + O o ) The value of Uwaste(x) remains independent of x: U waste ( x ) = – ( M w + P w + O w ) Calculating the cut-off grade requires finding the value of x such that Uore(x) = Uwaste(x). 00 per metric ton. Figure 3-4 shows the relationship between recovery and grade, as determined from metallurgical testing and historical production statistics.
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.
00 less than the London Metal Exchange gold price. 1035 grams per troy ounce was used in this calculation. 00 Material of grade x is wasted or treated as ore depending on which one of the two lines, Uwaste(x) or Uore(x), is highest on the graph. 43 gram/metric ton. 63 gram/metric ton results in a loss, but this loss is less than the cost of sending the same material to the waste dump. 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.