Environmental applications of surface and airborne geophysics in mining

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Mots clés : Environment;Exploration
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Publication: CIM Bulletin
Auteur(s): J.H Archibald
Numéro: 966
Volume: 86
Année: 1993
Texte
Sommaire: The proposed classification of ore reserves based on geostatistical and economic parameters is designed to be used as a communication tool to identify for investors, bankers, and financial analysts the degree of risk associated with a specific class of ore reserves. The class designation identifies the degree of accuracy of the estimates for tonnage and grade of annual production volumes of ore. It thus enables decision makers to quantify the risks and uncertainties inherent to the ore...
Publication: CIM Bulletin
Auteur(s): H.H. Wober, P.J. Morgan
Mots clés: Ore reserves, Economic expectation, Geostatistical methods, Feasibility studies, Definition of ore, Risk, Production volumes.
Numéro: 966
Volume: 86
Année: 1993
Texte
Sommaire: Traditional prospecting and boulder tracing are the two most important field techniques used in exploration for magnesite deposits hosted by sedimentary rocks. Consequently, success depends largely on the prospector's ability to identify magnesite. A density agent called sodium polytungstate (3Na3WO4-9WOfHf)) was successfully used to determine the presence of magnesite in sedimentary carbonate rocks of southeastern British Columbia. A rapid field method was developed and tested. This method...
Publication: CIM Bulletin
Auteur(s): George J. Simandl, Kirk D. Hancock, Suzanne Paradis, Jana Simandl
Mots clés: Exploration, Industrial minerals, Magnesite-bearing rocks, Sodium polytungstate, Prospecting techniques.
Numéro: 966
Volume: 86
Année: 1993
Texte
Sommaire: The availability of environmental data is a major concern in the development of an exploration project through the permitting and feasibility stages. The collection of these data should ideally start very early in a major exploration program. Although a large proportion of the environmental data can also be used for exploration purposes, (e.g. stream-sediment, soil, and rock analyses), environmental sampling will rarely have been initiated at an early date. For the Windy Craggy project, a...
Publication: CIM Bulletin
Auteur(s): Philip G. Claridge, Bruce W. Downing
Mots clés: Environmental geology, Geochemistry, Windy Craggy, Sulphide deposits, Exploration.
Numéro: 966
Volume: 86
Année: 1993
Texte
Sommaire: This paper describes the improvements made to the operation of a liquid phase, 300°C, heat transfer system in the paste plant of an aluminum smelter. These improvements were achieved by replacing the original heat transfer fluid, a synthetic aromatic, with a new technology, petroleum-based product. This new fluid, Calflo HTF, provided better thermal stability, with lower toxicity, and improved plant working conditions.
The procedures for fluid selection, changeout and performance...
Publication: CIM Bulletin
Auteur(s): A.F. Mikkelsen
Mots clés: Heat transfer systems, Aluminum smelters, Thermal stability, Calflo HTF.
Numéro: 966
Volume: 86
Année: 1993
Texte
Sommaire: Reservation of ground-water quality is a major environmental concern. The disposal of hazardous material from urban waste dumps, milling wastes in tailings ponds, and industrial wastes in injection wells may contaminate potential sources of potable ground-water. The containment or migration of contaminants in the subsurface depends on bedrock characteristics and type of overlying sediments. Fractured bedrock and permeable sediments that may provide pathways for the transport of potentially...
Publication: CIM Bulletin
Auteur(s): C.J. Mwenifumbo
Mots clés: Environmental geology, Geophysics, Borehole geophysics.
Numéro: 966
Volume: 86
Année: 1993
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