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– Distribution of tonnage by 'true' value in the example ore reserve with a $5 value error.  

– Distribution of tonnage by 'true' value in the example ore reserve with a $5 value error.  

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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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