Download e-book for iPad: An Introduction to Cut-Off Grade Estimation, Second Edition by Jean-Michel Rendu

By Jean-Michel Rendu

ISBN-10: 0873353935

ISBN-13: 9780873353939

An advent to Cut-off Grade Estimation examines the most vital calculations within the mining undefined. Cut-off grades are necessary to choosing the industrial feasibility and mine lifetime of a venture. Profitability and socioeconomic influence of mining operations are prompted via the alternative of cut-off grades. Cut-off grades play a key function 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, capability constraints, and chance price is defined in better element. a brand new part discusses mixing concepts, which play a serious position in progressively more mining operations.

Author Jean-Michel Rendu, an the world over famous specialist within the administration, estimation, and public reporting of mineral assets, presents functional insights. As a supervisor in significant mining businesses, a expert, and an educator, Rendu has got enormous event in all elements of mining engineering, adventure that used to be 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.

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Opportunity costs are associated with each constraint, which implies that the cut-off grade must be higher than the marginal cut-off grade, if the primary objective is to maximize net present value. Decisions that are made without fully understanding the effects, direct and indirect, of changing cut-off grades can have dire consequences. This was the case when very low marginal cut-off grades were first introduced in low-grade gold leaching operations. W H E N M A R G I N A L A N A LY S I S N O L O N G E R A P P L I E S : A G O L D L E A C H I N G O P E R AT I O N In the 1990s, many gold mining companies significantly increased the tonnage of material placed on their leach pads by lowering the cut-off grade.

7729 2 The function to be optimized is U ( T+ c ) = Q + c ⋅ r ( T+ c ) ⋅ V − T+ c ⋅ Po ( T+ c ) In this equation, Q+c ∙ r(T+c) ∙ V represents the value of copper in concentrate, and T+c ∙ Po(T+c) represents the processing costs. The relationship between U(T+c) and the cut-off grades (which defines T+c) is easily calculated using Table 3-1 and the three preceding equations. The results are summarized in Table 3-2 and shown in Figure 3-18. 5 million metric tons per year. 4 million metric tons per year.

All rights reserved. 42 CHAPTER THREE At the time the product recovered from the stockpiles is sold, the revenues are x ∙ rstp ∙ (Vstp – Rstp), where rstp is the expected recovery at the time of processing, Vstp is the dollar value of the product sold at the time it is sold, and Rstp is the corresponding cost of sales per unit of product sold. The recovery rstp may be less or higher than that which would apply to the same material if processed when mined. Sulfide material is likely to oxidize during stockpiling.

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