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 the commercial feasibility and mine lifetime of a undertaking. Profitability and socioeconomic influence of mining operations are inspired through the alternative of cut-off grades. Cut-off grades play a key function in estimating mineral reserves that may be publicly reported.
This new version is less complicated to learn and of higher functional curiosity to practitioners. the connection among optimization of web current price, skill constraints, and chance expense is defined in better aspect. a brand new part discusses mixing thoughts, which play a serious function in increasingly more mining operations.
Author Jean-Michel Rendu, an across the world well-known professional within the administration, estimation, and public reporting of mineral assets, offers useful insights. As a supervisor in significant mining businesses, a expert, and an educator, Rendu has obtained significant event in all features of mining engineering, event 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 cutting edge in their profession.
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Additional resources for An Introduction to Cut-Off Grade Estimation, Second Edition
62 g/t C U T- O F F G R A D E W I T H VA R I A B L E R E C O V E R Y Mathematical Formulation In the previous examples, it was assumed that the recovery achieved in the processing plant was a constant. 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.
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).
00 for mill. 00-perounce charge. 50 x ) The relationship between recovery r(x) and average grade x is shown in Figure 3-9. 43 Copyright © 2013 Society for Mining, Metallurgy, and Exploration, Inc. All rights reserved. 0 Gold Grade, g/t Figure 3-9â•… Relationship between recovery and average grade with constant tail These relationships are depicted in Figure 3-10. 41 g/t B R E A K E V E N C U T- O F F G R A D E A N D P O LY M E TA L L I C DEPOSITS Polymetallic deposits are defined as deposits that contain more than one metal of economic value.
An Introduction to Cut-Off Grade Estimation, Second Edition by Jean-Michel Rendu