By Jean-Michel Rendu
An creation to Cut-off Grade Estimation examines the most very important calculations within the mining undefined. Cut-off grades are necessary to selecting the commercial feasibility and mine lifetime of a undertaking. Profitability and socioeconomic effect of mining operations are prompted through 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, skill constraints, and chance price is defined in larger aspect. a brand new part discusses mixing innovations, which play a severe function in a growing number of mining operations.
Author Jean-Michel Rendu, an across the world well-known professional within the administration, estimation, and public reporting of mineral assets, offers functional insights. As a supervisor in significant mining businesses, a specialist, and an educator, Rendu has bought massive adventure in all points of mining engineering, event 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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Extra info for An Introduction to Cut-Off Grade Estimation, Second Edition
All rights reserved. Breakeven Cut-off Grade 27 In this formula, the numerator is the difference between costs incurred if one metric ton of material is sent to process 1 and costs incurred if the same metric ton is sent to process 2. , one ounce of contained gold or one pound of contained copper) to process 1 and revenues resulting from sending the same metric ton to process 2. Precious Metal Example Consider a gold mining operation from which material can be sent to either of two processing facilities, a leach pad (process 1) or a mill (process 2).
The formulas that must be used to calculate the utility of sending one metric ton of material to a given destination or process must consider the contribution of each metal. The decision whether one metric ton of material should be wasted or sent to the processing plant can no longer be made on the basis of grade alone. Dollar values must be calculated for each possible process, and the cut-off between ore and waste must be expressed in dollar terms. General Considerations Consider a metric ton of material that contains two valuable metals, copper and gold.
00 per ounce of gold sold The utilities of sending one metric ton of material to the waste dump, the leach pad, or the mill are calculated below. 1035 g) to obtain cut-off grades in grams per metric ton. 00 Copyright © 2013 Society for Mining, Metallurgy, and Exploration, Inc. All rights reserved. 5 2 ($20) ($40) Waste Utility Mill Utility ($60) Gold Grade, g/t Figure 3-6â•… Graphical estimation of cut-off grade between wasted, leached, and milled material These utility functions are plotted in Figure 3-6.