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 opting for the commercial feasibility and mine lifetime of a undertaking. Profitability and socioeconomic impression of mining operations are stimulated through the alternative of cut-off grades. Cut-off grades play a key position in estimating mineral reserves that may be publicly reported.
This new version is simpler to learn and of larger useful curiosity to practitioners. the connection among optimization of internet current worth, skill constraints, and chance expense is defined in better element. a brand new part discusses mixing options, which play a serious position in increasingly more mining operations.
Author Jean-Michel Rendu, an across the world famous specialist within the administration, estimation, and public reporting of mineral assets, presents useful insights. As a supervisor in significant mining businesses, a expert, and an educator, Rendu has obtained substantial event in all features of mining engineering, adventure that was once integrated 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
8 Cut-off Grade, g/t Figure 4-1â•… Estimation of tonnage and grade above cut-off grade grade–tonnage curve shown in Figure 4-1. 36 g/t and containing 288,000 oz of gold. The leach recovery was expected to be 65%, resulting in the production of 187,000 oz in the coming year. 40 g/t if the recovery could be maintained at 65%. Laboratory tests confirmed that recovery was independent of grade, and the decision was made to lower the cut-off grade and add the lower-grade material to the pad. After two months of operation, managers realized that the gold production target for the year was not going to be met.
Sulfide material is likely to oxidize during stockpiling. If a sulfide flotation process is to be used, oxidation will result in lower recovery. Conversely, if an oxide leach process is to be applied to material that was not fully oxidized when mined, stockpiling may result in enhanced recovery. There are obvious difficulties in using these formulas, the main one being that future costs and revenues are difficult or impossible to estimate with accuracy. Furthermore, because processing of stockpiled material is likely to occur late in the mine life, the net present value of future revenues is likely to be small compared with costs incurred at the time of mining and to maintain the stockpile over time.
00. 00 per troy ounce. The mill recovery is 89%. 34 g/t C U T- O F F G R A D E B E T W E E N T W O P R O C E S S E S Mathematical Formulation If two processes are available to treat the same material, cut-off grades must be calculated to separate waste from ore being processed and to decide to which one of the two processes the ore should be sent. How to decide whether material should be processed or wasted was discussed previously. To decide between two processes, the utility of sending material of grade x to process 1 must be compared with that of sending the same material to process 2.