Séquences optimales d'exploitation dans les gisements trés inclinés.

LÕanalyse des sŽquences dÕexploitation, actuellement en usage pour les gisements tr?s inclinŽs, a dŽmontrŽ quÕelles ne sont pas toujours optimales du point de vue du contr™le des terrains et de la concentration des travaux dÕabattage (nombre de chantiers simultanŽment en opŽration). Effectivement plusieurs sŽquences sont tr?s propices ˆ la crŽation des nombreuses zones de hautes contraintes, qui sont ˆ lÕorigine des effets de pilier. LÕŽtude de cas de la mine Lac Shortt a dŽmontrŽ que certaines sŽquences dÕexploitation, actuellement en usage, ne sont surtout pas adŽquates dans le cas dÕun Žtat ŽlevŽ des contraintes naturelles. En effet la mine a eu de sŽrieuses probl?mes avec le contr™le des terrains (coups de terrains et les effondrements des Žpontes). Ces effondrements Žtaient responsables de la dilution excessive et des pertes importantes des rŽserves mini?res. Les deux nouvelles sŽquences proposŽes, visent la meilleure redistribution des contraintes dÕexploitation en vue dÕŽliminer la crŽation des effets de pilier. En plus elles permettent une concentration plus ŽlevŽe des travaux dÕabattage
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Summary: The recovery of cyanide from a gold mill solution containing high levels of copper (400 mg/L to 900 mg/L) using the AVR process was evaluated. It was determined that acidification to pH 2 to 3 provides a suitable balance between HCN generation, copper precipitation and acid consumption. A short pilot plant campaign showed that ~75% of the feed WAD cyanide was recovered while the remainder precipitated along with copper upon acidification. The acid consumption averaged 3.5 g H2SO4 per litre of...
Publication: CIM Bulletin
Author(s): P.A. Riveros, D. Koren, V.M. McNamara, J. Binvignat
Issue: 1025
Volume: 91
Year: 1998
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Summary: The gemological properties that allow natural emeralds and blue sapphires to be distinguished from other gemstones are summarized int this paper. A variety of synthetic and laboratory-treated emeralds and blue sapphires are also encountered in the jewelry industry today. Gemologists distinguish these latter materials from their natural counterparts based primarily upon features seen with magnification, such as inclusions and/or growth zoning. In some cases, however, these observations and...
Publication: CIM Bulletin
Author(s): J.E. Shigley
Issue: 1025
Volume: 91
Year: 1998
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Summary: In this paper, the author offers a personal view of what the next 30 years holds for mineral processing. Restating that mineral processing will remain a vibrant industry in raw material production, growth opportunities in waste management are identified. The processing sequence familiar now (mining ® mineral processing ® extraction) will become more interwoven. In situ processing (i.e., milling underground) will evolve from concept to demonstration. Opportunities to exploit physical propertie...
Publication: CIM Bulletin
Author(s): J.A. Finch
Issue: 1025
Volume: 91
Year: 1998
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