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Blast induced movement and its effect on grade dilution at the Coeur Rochester Mine
AuthorTaylor, Stephen L
Mining and Metallurgical Engineering
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A significant portion of the open pit gold and silver mines in the western US are disseminated deposits with highly irregular mineralization. In some cases, blast induced movement can cause significant dilution in such deposits. Due to the nature of the ore body and the high powder factor required, the Coeur Rochester mine encountered unacceptable dilution levels. Investigations have shown that the rock typically moves seven feet horizontally in the top portions of the blast and twenty-five feet horizontally at the bottom of the blast. This thesis describes how the blast induced movement was characterized and how the Coeur Rochester mine can account for this blast induced movement in the ore control procedures. An estimate is made of the magnitude of the dilution presently encountered and the economic impact a modified ore control procedure could have if implemented at the mine.
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