Ore Reserve Calculations

  • J. H. Reedman


Ore is defined as a mineral or mineral aggregate more or less mixed with a gangue, from which a metal or metals can be won at a profit or in the hopes of a profit.* From this definition it follows that local production and transportation costs are a prime factor and what may constitute an ore body in one region may not do so in a more remote part of the world. The term ‘ore’, therefore, should not be applied indiscriminately to any mineral deposit and the term ‘ore zone’ should be avoided when referring to mineralized intersections in boreholes and trenches unless they are clearly part of a deposit which has distinct possibilities of being economic. On the other hand, one should not be too pedantic about the term ‘ore’, otherwise mining engineers would forever be adding to and subtracting from ore reserves on the basis of metal price fluctuations. In extreme cases, of course, this does happen when sharp price rises may bring material that was considered as waste into the ore reserves and, vice versa, when rising costs and depressed prices may result in ore being reclassified as waste. As regards deposits not undergoing exploitation, it is acceptable to refer to the mineralization as ‘ore’ when a reasonable tonnage has been shown to exist and when there is a distinct hope that it might be worked at a profit.


Drill Hole Copper Deposit Plan Method Average Grade Mineral Exploration 
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Copyright information

© Applied Science Publishers Ltd 1979

Authors and Affiliations

  • J. H. Reedman
    • 1
  1. 1.Noranda Exploration Company LtdWinnipegCanada

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