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– Example of the error of a fi xed recovery assumption and the conservatism of a fi xed tail recovery assumption..  

– Example of the error of a fi xed recovery assumption and the conservatism of a fi xed tail recovery assumption..  

Source publication
FIG 1-Distribution of tonnage by value in an ore reserve for a real and...
TABLE 1 The example ore reserve at three diff erent cut-off values.
FIG 2 – Distribution of value in an ore reserve for the same...
FIG 3 – Distribution of tonnage by 'true' value in the example ore...
+6 FIG 4 – Example of the error of a fi xed recovery assumption and the...
Negatively Geared Ore Reserves - A Major Peril of the Break-Even Cut-Off Grade, AusIMM Project Evaluation Conference, April 2016
Conference Paper
Full-text available
  • Mar 2016
Recognising that the mining industry is wedded to the break-even cut-off grade rather than a cut-off grade that optimises value, the author examines some perils and pitfalls in the use of break-even grades that lead to what the author calls “negatively geared ore reserves”. Negatively geared ore reserves occur when a portion of the ore reserves act...
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Contexts in source publication

Context 1
... a fi xed tail is overly conservative is shown in Figure 4, which is based on laboratory test data for Pascua-Lama (Silver Wheaton, 2009). Figure 4 also shows the error of assuming a fi xed processing recovery. ...
Context 2
... a fi xed tail is overly conservative is shown in Figure 4, which is based on laboratory test data for Pascua-Lama (Silver Wheaton, 2009). Figure 4 also shows the error of assuming a fi xed processing recovery. A percentage tail model is often required to best refl ect a deposit's recovery characteristics. ...