Séquences optimales d'exploitation dans les gisements trés inclinés.

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Sommaire: 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
Auteur(s): P.A. Riveros, D. Koren, V.M. McNamara, J. Binvignat
Numéro: 1025
Volume: 91
Année: 1998
Texte
Sommaire: 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
Auteur(s): J.E. Shigley
Numéro: 1025
Volume: 91
Année: 1998
Texte
Sommaire: 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
Auteur(s): J.A. Finch
Numéro: 1025
Volume: 91
Année: 1998
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