Assessment and Control of Ore Dilution in Long Hole Mining: Case Studies |
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Authors: | John G Henning Hani S Mitri |
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Institution: | (1) Goldcorp Canada Inc., Porcupine Gold Mines, 4315 Gold Mine Rd., South Porcupine, ON, Canada, P0N1H0;(2) Department of Mining, Metals and Materials Engineering, McGill University, 3450 University St., Montreal, QC, Canada, H3A2A7 |
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Abstract: | Unplanned ore dilution has a direct and large influence on the cost of a stope, and ultimately on the profitability of a mining
operation. This paper presents the results of an examination of factors influencing ore dilution in a blasthole stoping environment.
For the study, a comprehensive database was established, incorporating information related to the design, construction, excavation
and cavity surveys of 172 sequentially mined long hole stope case histories from two orezones. Through a review of the case
studies, it was demonstrated that, in addition to stope dimension, the amount of unplanned dilution differed according to
stope type. Five stope types were identified, based on their position within a tabular blasthole mining sequence. Measured
overbreak varies with stope type, with secondary stopes generating a greater volume of hanging-wall dilution than do primary
stopes. Furthermore, a case study is presented to demonstrate the role cablebolts installed in the stope hanging-wall play
to control ore dilution. The study illustrates relationships between measured hanging-wall overbreak, cablebolt orientation
and stope type. |
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Keywords: | Parametric numerical modeling Ore dilution Rock mechanics Underground mining Hanging-wall reinforcement Stope type Stope case study |
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