By Jean-Michel Rendu
An advent to Cut-off Grade Estimation examines the most very important calculations within the mining undefined. Cut-off grades are necessary to picking out the industrial feasibility and mine lifetime of a undertaking. elevated cut-off grades can lessen political dangers by means of making sure better monetary returns over a shorter time period. Conversely, reduce cut-off grades could raise undertaking existence with longer fiscal merits to shareowners, staff, and native groups. Cut-off grades additionally impression pronounced reserves, that are heavily monitored via inventory exchanges and regulatory organisations.
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Extra resources for An Introduction to Cut-off Grade Estimation
2008 by the Society for Mining, Metallurgy, and Exploration. All rights reserved. Electronic edition published 2009. CHAPTER FIVE Cut-off Grade and Optimization of Processing Plant Operating Conditions In this chapter, a method is developed to optimize a copper mining operation where mining capacity is fixed, but the capacity of the processing plant can be changed by changing grind size. Depending on the metallurgical properties of the ore, using a coarser grind will increase plant throughput while reducing cost per metric ton processed and decreasing recovery.
A minimum grade is occasionally quoted when referring to the average grade that a stope must exceed before it is considered for mining. Strictly speaking, this is not a cut-off grade but an average grade, which must be linked to a tonnage. The minimum stope average grade depends on the size of the stope, its location with respect to existing facilities, ease of access, and other stope-specific characteristics. This average grade is that for which the cost of developing the stope and mining it is expected to be less than the profit made by processing the ore and selling the final product.
2008 by the Society for Mining, Metallurgy, and Exploration. All rights reserved. Electronic edition published 2009. 0 –$5 –$10 –$15 Grade, grams per metric ton FIGURE 3-3 Graphical estimation of cut-off grade between wasted, leached, and milled material Base Metal Example Consider a copper mine for which production can be either leached or milled. 05 overhead cost per metric ton of leach ore © 2008 by the Society for Mining, Metallurgy, and Exploration. All rights reserved. Electronic edition published 2009.
An Introduction to Cut-off Grade Estimation by Jean-Michel Rendu