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 making a choice on the industrial feasibility and mine lifetime of a venture. Profitability and socioeconomic impression of mining operations are prompted via the alternative of cut-off grades. Cut-off grades play a key position in estimating mineral reserves that may be publicly reported.
This re-creation is less complicated to learn and of larger useful curiosity to practitioners. the connection among optimization of web current price, means constraints, and chance expense is defined in larger element. a brand new part discusses mixing thoughts, which play a severe function in a growing number of mining operations.
Author Jean-Michel Rendu, an the world over well-known specialist within the administration, estimation, and public reporting of mineral assets, presents useful insights. As a supervisor in significant mining businesses, a specialist, and an educator, Rendu has received significant event in all points of mining engineering, adventure that was once 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 innovative in their profession.
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Additional resources for An Introduction to Cut-Off Grade Estimation, Second Edition
Example text
The relationship between U(T+c) and the cut-off grades (which defines T+c) is easily calculated using Table 3-1 and the three preceding equations. The results are summarized in Table 3-2 and shown in Figure 3-18. 5 million metric tons per year. 4 million metric tons per year. Copyright © 2013 Society for Mining, Metallurgy, and Exploration, Inc. All rights reserved. 7729 30 35 40 45 50 55 60 Metric Tons Processed per Year, millions Figure 3-17â•… Relationship between copper recovery and tonnage processed per year Copyright © 2013 Society for Mining, Metallurgy, and Exploration, Inc.
5 ($20) ($40) ($60) Waste-Mill Cut-off Waste Utility Gold Grade, g/t Figure 3-10â•… Graphical estimation of cut-off grade between wasted and milled material with constant tail associated with one metric ton of material sent to the flotation plant are Mo, Po, and Oo, respectively. The corresponding costs per metric ton of waste are Mw, Pw, and Ow. 5% of the value of the copper contained in the concentrate after deducting d1, and p2 = 99% of the gold contained. Smelter cost deductions are Cs per metric ton of concentrate.
Figures 3-2 and 3-3 give graphical representations of the utility functions used to calculate the mill and mine cut-off grades, respectively. In the previous calculations leading to Equation 3-6, the external or mine cut-off grade is that which applies to one metric ton of material of grade x that is exposed to the surface but had not been included in the mine plan. This material can be mined without waste stripping. This next formula considers the case where some waste stripping is needed to mine this material.