Title

Cutoff Grade Determination for Mines Producing Direct-Shipping Iron Ore

Abstract

A number of high grade ores such as iron are sold at defined marketing grade specifications. The traditional cutoff grade theory cannot be used with these ores as the direct-shipping grades are fixed by the sale contract. The optimum cutoff grade for these cases is redefined as the grade that maximizes the marketable reserves. A method is described in this paper to determine these optimum cutoff grades for iron ore mines producing direct-shipping ore. An iterative approach is developed which allows the maximization of marketable reserves while maintaining the grades of iron and impurities of silica and alumina within market contract specifications. The larger reserves allow a longer mine lire and increased operation profitability.

Department(s)

Mining and Nuclear Engineering

Keywords and Phrases

Blending; Cutoff Grade; Grade-Tonnage Curves; Iron Ore

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1984 Australasian Institute of Mining and Metallurgy (AusIMM), All rights reserved.

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