By Jean-Michel Rendu
An advent to Cut-off Grade Estimation examines the most vital calculations within the mining undefined. Cut-off grades are necessary to identifying the industrial feasibility and mine lifetime of a venture. Profitability and socioeconomic impression of mining operations are prompted by means of the alternative of cut-off grades. Cut-off grades play a key function in estimating mineral reserves that may be publicly reported.
This re-creation is less complicated to learn and of larger sensible curiosity to practitioners. the connection among optimization of web current price, means constraints, and chance price is defined in larger aspect. a brand new part discusses mixing suggestions, which play a serious position in increasingly more mining operations.
Author Jean-Michel Rendu, an the world over famous professional within the administration, estimation, and public reporting of mineral assets, offers sensible insights. As a supervisor in significant mining businesses, a expert, and an educator, Rendu has bought enormous adventure in all facets of mining engineering, adventure that used to be included into this publication.
This is a must-read for mine managers, analysts, geologists, mining engineers, and public policymakers who are looking to remain at the cutting edge in their profession.
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Additional info for An Introduction to Cut-Off Grade Estimation, Second Edition
5 million metric tons. The higher-grade tons could be sent to the mill and the lower-grade tons 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. The result would be a decrease in operating cost per metric ton. However, this is expected to result in a decrease in mill recovery. 1 T+ c This relationship between operating cost per metric ton and tonnage processed per year is shown in Figure 3-16.
5 million metric tons per year with an average copper recovery of 95%. 24 per metric ton. 25% Cu Copyright © 2013 Society for Mining, Metallurgy, and Exploration, Inc. All rights reserved. 32 Cut-off Grade, % Cu Figure 3-14â•… Next year expected relationship between tonnage and grade above cut-off grade Copyright © 2013 Society for Mining, Metallurgy, and Exploration, Inc. All rights reserved. 381% Cu and containing 332 million 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 the mill feed and throughput, which would result in increased utility.
00-perounce sales cost. The maximum gold recoveries are 60% for leaching and 90% for milling. Significantly lower recoveries are achieved for low-grade material. Figure 3-7 shows the relationship between recoveries and grade, as determined from metallurgical testing and historical production statistics. 00). 1035). Figure 3-8 also shows how the cut-off grade can be determined by graphical method. The relationship between the utility of leaching or milling material and the average grade of this material is no longer linear.
An Introduction to Cut-Off Grade Estimation, Second Edition by Jean-Michel Rendu