A critical examination of the methods and factors affecting the selection of an optimum production rate

Abstract The selection of the production rate is one of the most crucial decisions to be made in the development of a mineral property. However, it is not uncommon for the production rate to be decided arbitrarily, before any technical evaluations begin, and it is often not reconsidered when better data becomes available. A number of methods are used in the mineral industry to select the production rate for a project. There is general agreement that the size of the ore reserve has a strong influence on this decision, but what other factors are involved? Is there a way to identify an optimum rate? This paper examines the factors that influence the selection of a production rate from the perspective of project economics. The NPV maximum value should be viewed as a “failure” point. The
“two times capital” maximum is proposed as a lower limit. A practical check is suggested to confirm that a selected rate is in an optimum range. Production rate assumptions are much more likely to be reviewed for marginal projects, but they should also be reviewed for viable projects.
Keywords: Mineral economics, Production rates, Optimum production rates.
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Summary: Hot forming and superplasticity in powder metallurgy aluminum alloys and composites is reviewed. The effects of alloy composition, particulate composition, size, and size distribution is summarized. The role of climb distance for recovery is described in connection with the size of strengthening phases. In materials with fine strengthening phases on the order of one micron or less, high strain rate superplastic deformation processes are likely. However, the quality of superplastic deformation...
Publication: CIM Bulletin
Author(s): T.R. Bieler
Keywords: Metallurgy, Aluminum alloys, Powder metallurgy, Metal matrix composites, Hot working, Superplasticity, Post-forming properties.
Issue: 1007
Volume: 90
Year: 1997
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Summary: The effect of extended ball milling has been studied for two industrial processes: (1) the processing of metal sulphide concentrates; and (2) the carbothermic reduction of ilmenite to synthetic rutile. The plant concentrates were a gold ore with 128 g/t Au of which 8% was non-refractory and a zinc concentrate with copper impurities.
The gold concentrate showed complete dissolution of the gold bearing minerals after milling giving almost complete gold liberation. The zinc concentrate showed...
Publication: CIM Bulletin
Author(s): Nicholas J. Welham
Keywords: Mineral processsing, Extended ball milling, Milling.
Issue: 1007
Volume: 90
Year: 1997
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Summary: Niobec mine, a producer of pyrochlore concentrates since 1976, became a producer of ferroniobium in 1994 and achieved accreditation to the ISO 9002 standard in 1995. The goal of ISO 9002 is to ensure that the products supplied to clients regularly meet their specifications, through explicit work standards and procedures throughout the production process, from deposit appraisal to ferroniobium production. A key element of ISO 9002 implementation at Niobec consists of the quality control...
Publication: CIM Bulletin
Author(s): Denis Villeneuve, Eddy Dénommé
Keywords: Geology, Exploration, ISO 9002, Niobec Mine.
Issue: 1007
Volume: 90
Year: 1997
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