Water well complaints — underground streams and local farmers

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Sommaire: Soft-sensors are a computer software alternative to Inadequate hardware instrumentation. Filters are averaging methods that reduce the noise in any sensor's signal. This paper introduces these topics and places them in a mineral processing context using the n-product formula.
Publication: CIM Bulletin
Auteur(s): R. Spring
Numéro: 965
Volume: 85
Année: 1992
Texte
Sommaire: The mining industry is adjusting its sights to take a shot at the rising level of non-profit taxes which threaten to handicap the industry's competitive advantage. In the case of this particular expedition, the industry evidentally has a strong ally — the country's mines ministers. It appears that an initiative is under way to assess the impact of non-profit taxes on mining in Canada as compared to other mining nations.
Publication: CIM Bulletin
Auteur(s): Robert B. Parsons
Numéro: 965
Volume: 85
Année: 1992
Texte
Sommaire: While time and again many authors have categorically stressed the restoration of the environment, very little effort has been made in the mineral industry to develop the economy of environmental control. There are many abatement procedures that search a maze of variants. Among them pricing environmental damage seems to be more logical and easily implementable.
Publication: CIM Bulletin
Auteur(s): S.K. Mukhopadhyay, S.K. Pal, J. Bhattacharya
Numéro: 965
Volume: 85
Année: 1992
Texte
Sommaire: The raw ores which are processed in mineral processing plants exhibit very strong variations of their physical and chemical properties. As a consequence, the performances of the comminution and separation processes vary greatly from time to time. Model-based control strategies improve the performance of the plant; however, they require some form of adaptation to cope with the variations of the ore properties.
This paper deals with the use of adaptive techniques for the control of mineral...
Publication: CIM Bulletin
Auteur(s): D. Hodouin, K. Najim
Numéro: 965
Volume: 85
Année: 1992
Texte
Sommaire: Exposure to airborne respirable silica in surface and underground mine operations is known to be the cause of industrial lung diseases. For this reason, silica is a regulated substance and worker exposure must be monitored regularly. Diesel exhaust also contains substances which are potential caricinogens. In an underground setting, diesel particulate may be the main component of what is referred to as respirable combustible dust (RCD). Although diesel particulate or soot is not at present a...
Publication: CIM Bulletin
Auteur(s): M. Grenier, S. Hardcastle, D. Mchaina, M. Gangal
Numéro: 965
Volume: 85
Année: 1992
Texte
Sommaire: The early history of the Geological Survey of Canada is closely connected with coal geology investigations in the Atlantic Provinces.
In 1843, Sir William Logon, the first director of the Geological Survey, measured the 4441 m thick shore section at Joggins in Nova Scotia. Detailed mapping of the coalfields were subsequently carried out by H. Fletcher during the latter part of the nineteenth and first part of the present century. During the 1920-1940 period, the stratigraphy of the carbonifer...
Publication: CIM Bulletin
Auteur(s): Peter A. Hacquebard
Numéro: 965
Volume: 85
Année: 1992
Texte
Sommaire: Canadian copper, nickel, zinc, lead and molybdenum mines are characterized by the mining of ores from which more than one metal is recovered. During the 1980s, approximately 15% of the gold, 25% of the zinc, 30% of the copper, 55% of the molybdenum, 80% of the silver and 90% of the lead produced from Canadian mines were produced as co-products and by-products of base metal mining operations. This trend is not expected to change significantly in the near future. The presence of co-products and...
Publication: CIM Bulletin
Auteur(s): L.S. Jen
Numéro: 965
Volume: 85
Année: 1992
Texte
Sommaire: This paper is based on data generated between October, 1986 and October, 1989, during the implementation of an Ecological Engineering close-out for a zinc mine in Northern Ontario, where 690 000 tonnes of tailings contain 41.1% pyrite and 4.1% pyr-rhotite. The objective was to determine rates of sulphide oxidation and iron precipitation in the tailings. Those rates are relevant for the assessment of the long-term effectiveness of biological systems employed in the removal of heavy metals from...
Publication: CIM Bulletin
Auteur(s): M. Kalin, R.O. van Everdingen, R.G.L. McCready
Numéro: 965
Volume: 85
Année: 1992
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