An Introduction to Cut-off Grade Estimation by Jean-Michel Rendu

By Jean-Michel Rendu

An advent to Cut-off Grade Estimation examines some of the most vital calculations within the mining undefined. Cut-off grades are necessary to deciding upon the industrial feasibility and mine lifetime of a undertaking. elevated cut-off grades can decrease political hazards via making sure larger monetary returns over a shorter time period. Conversely, reduce cut-off grades may well bring up undertaking existence with longer monetary merits to shareowners, staff, and native groups. Cut-off grades additionally influence pronounced reserves, that are heavily monitored by way of inventory exchanges and regulatory enterprises.

Show description

Read or Download An Introduction to Cut-off Grade Estimation PDF

Similar mining books

Petroleum Geology of Libya

Libya has the most important petroleum reserves of any kingdom in Africa and because creation all started in 1961 over 20 billion barrels of oil were produced. Libya is scheduled to arrive the mid-point of depletion of reserves in 2001 and this offers a well timed aspect at which to study the country of petroleum exploration in Libya.

Uranium frenzy: saga of the nuclear west

Now improved to incorporate the tale of nuclear checking out and its effects, Uranium Frenzy has develop into the vintage account of the uranium rush that gripped the Colorado Plateau sector within the Nineteen Fifties. Instigated through the U. S. government's desire for uranium to gasoline its growing to be atomic guns application, encouraged by way of Charlie Steen's profitable Mi Vida strike in 1952, manned through rookie prospectors from all walks of lifestyles, and pushed to a fever pitch via penny inventory promotions, the increase created a colourful period within the 4 Corners area and Salt Lake urban (where the inventory frenzy was once headquartered) yet eventually went bust.

Petroleum Geoscience

Petroleum Geoscience is a entire creation to the appliance of geology and geophysics to the hunt for and construction of oil and fuel. Uniquely, this publication is dependent to mirror the sequential and cyclical methods of exploration, appraisal, improvement and construction. Chapters devoted to each one of those elements are extra illustrated via case histories drawn from the authors stories.

Extra resources for An Introduction to Cut-off Grade Estimation

Example text

Electronic edition published 2009. 01362 The results obtained are plotted in Figure 5-5 and shown in Table 5-3. 0 (Figure 5-5). 22%Cu will reach this objective, © 2008 by the Society for Mining, Metallurgy, and Exploration. All rights reserved. Electronic edition published 2009. 50 CHAPTER FIVE Utility of Processing Specified Tonnage, millions $300 $290 $280 $270 $260 $250 $240 $230 $220 $210 $200 25 30 35 40 45 50 55 60 Tonnage of Mill Feed, million metric tons FIGURE 5-4 Relationship between utility U(T+c) and tonnage of mill feed T+c Change in Utility When One Metric Ton Is Added to Mill Feed, per metric ton $8 $6 $4 $2 $0 25 30 35 40 45 50 55 60 $(2) $(4) $(6) $(8) Tonnage of Mill Feed, million metric tons FIGURE 5-5 Relationship between incremental utility dU(T+c)/dT+c and tonnage of mill feed T+c © 2008 by the Society for Mining, Metallurgy, and Exploration.

Electronic edition published 2009. 32 CHAPTER THREE Constant Tail: Mathematical Formulation A model often used to represent the relationship between plant recovery and average grade of plant feed is the constant tail model. This model assumes that a fixed amount of metal cannot be recovered, whatever the grade of the material sent to the plant. 05 overhead cost per metric ton of waste Figure 3-6 illustrates the relationship between recovery r(x) and average grade x. 04 ⁄ ( 100x ) ] if x > c © 2008 by the Society for Mining, Metallurgy, and Exploration.

Electronic edition published 2009. CUT-OFF GRADE AND OPTIMIZATION OF PROCESSING PLANT 47 Alternatively, one could consider a decrease in cut-off grade. 344%Cu. 5 million metric tons. The higher-grade material could be sent to the mill and the lower-grade material 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.

Download PDF sample

Rated 5.00 of 5 – based on 18 votes