An Introduction to Cut-Off Grade Estimation, Second Edition by Jean-Michel Rendu

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 industrial feasibility and mine lifetime of a undertaking. Profitability and socioeconomic effect of mining operations are encouraged by means of 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 simpler to learn and of larger useful curiosity to practitioners. the connection among optimization of web current worth, means constraints, and chance price is defined in better element. a brand new part discusses mixing concepts, which play a severe function in increasingly more mining operations.

Author Jean-Michel Rendu, an the world over famous specialist within the administration, estimation, and public reporting of mineral assets, offers useful insights. As a supervisor in significant mining businesses, a specialist, and an educator, Rendu has bought huge event in all features of mining engineering, event 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.

Show description

Read Online or Download An Introduction to Cut-Off Grade Estimation, Second Edition PDF

Best mining books

Petroleum Geology of Libya

Libya has the most important petroleum reserves of any nation in Africa and because creation 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 gives a well timed aspect at which to study the kingdom of petroleum exploration in Libya.

Uranium frenzy: saga of the nuclear west

Now elevated to incorporate the tale of nuclear trying out and its results, Uranium Frenzy has develop into the vintage account of the uranium rush that gripped the Colorado Plateau sector within the Fifties. Instigated by means of the U. S. government's want for uranium to gas its becoming atomic guns software, prompted through Charlie Steen's profitable Mi Vida strike in 1952, manned via rookie prospectors from all walks of lifestyles, and pushed to a fever pitch by way of penny inventory promotions, the growth created a colourful period within the 4 Corners quarter and Salt Lake urban (where the inventory frenzy used to be situated) yet finally went bust.

Petroleum Geoscience

Petroleum Geoscience is a finished advent to the appliance of geology and geophysics to the quest for and construction of oil and gasoline. Uniquely, this publication is based to mirror the sequential and cyclical procedures of exploration, appraisal, improvement and construction. Chapters devoted to each one of those facets are additional illustrated via case histories drawn from the authors stories.

Extra info for An Introduction to Cut-Off Grade Estimation, Second Edition

Sample text

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. 00 Copyright © 2013 Society for Mining, Metallurgy, and Exploration, Inc. All rights reserved. 43% Cu (EQ 3-7) This cut-off grade could have been calculated directly by substituting the appropriate values in Equation 3-4.

For many processes and deposits, the recovery r is a function r(x) of the head grade x. The value of Uore(x) must then be written as follows: U ore ( x ) = x ⋅ r ( x )⋅( V − R ) − ( Mo + Po + Oo ) The value of Uwaste(x) remains independent of x: U waste ( x ) = − ( M w + Pw + O w ) Copyright © 2013 Society for Mining, Metallurgy, and Exploration, Inc. All rights reserved. Breakeven Cut-off Grade 29 100 90 Mill Recovery Gold Recovery, % 80 70 60 50 40 30 Leach Recovery 20 10 0 0 1 2 3 4 5 6 7 8 Gold Grade, g/t Figure 3-7â•… Relationship between recoveries and average grade Calculating the cut-off grade requires finding the value of x such that Uore(x) = Uwaste(x).

To decide whether material of grade x should be wasted or stockpiled, one must compare the utility of wasting Uwaste(x) with that of stockpiling Ustp(x). The cut-off grade between stockpile and waste is the value xc of x for which Ustp(x) = Uwaste(x). Copyright © 2013 Society for Mining, Metallurgy, and Exploration, Inc. All rights reserved. Breakeven Cut-off Grade 41 The utility of wasting material of grade x is U waste ( x ) = − ( M w + Pw + O w ) To calculate the utility of stockpiling, one must take into consideration stockpiling costs, and the cost of retrieving material from the stockpile and processing it at a later date.

Download PDF sample

Rated 4.61 of 5 – based on 12 votes