Asbestos in asphalt

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Mots clés : Industrial minerals;Asbestos
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Texte
Sommaire: Two recent decisions by the Canadian courts could reduce the taxes paid by many profitable mines in Canada. At a time when the mining sector is hurting from an ever increasing tax burden and soft prices, the results of two cases are welcome news. Mining companies are well advised to check prior years' tax returns in the context of these developments.
Publication: CIM Bulletin
Auteur(s): Robert B. Parsons
Numéro: 949
Volume: 84
Année: 1991
Texte
Sommaire: In situ bulk density of coal is a variable applied to various aspects of coal resource evaluation, such as compositing ply analyses of coal attributes that are expressed on a weight per cent basis, and determining tonnages from volume estimates. Its value is a function of composition and porosity of the in situ material. When densities of ash-free coal, ash and water are fixed, in situ bulk density of a coaly mix can be expressed as a function of proportionate weight of ash in the mix....
Publication: CIM Bulletin
Auteur(s): G. Grant Smith
Mots clés: Coal, In situ bulk density, Compositing, Resource estimation.
Numéro: 949
Volume: 84
Année: 1991
Texte
Sommaire: As demands upon the earth's natural resources continue to grow, exploration companies, mining organizations and others face the problem of the need to tackle increasingly more difficult strata to open up new reserves. Innovations in materials technology and tool design have steadily improved this capability, but none perhaps so drastically as a recently introduced cemented carbide in which tool wear resistance and/or toughness can be tailored precisely to the user's drilling needs.
Publication: CIM Bulletin
Auteur(s): Lars Liljeblad
Mots clés: Equipment design, Materials technology, Drilling equipment, Tungsten carbide, Cobalt.
Numéro: 949
Volume: 84
Année: 1991
Texte
Sommaire: In late 1985, Hudson Bay Mining and Smelting Co., Limited announced the Namew Mine/Mill project. Environmental baseline monitoring and planning began in early 1985 while a major drilling program was under way to delineate the ore deposit. This paper overviews the environmental assessment work conducted for the mine/mill operation, and outlines the tailings and water management practices.
Planned environmental works and approach were affected in late 1988 when a massive water problem was...
Publication: CIM Bulletin
Auteur(s): W.W. Fraser
Mots clés: Environmental management, Namew Lake, Hudson Bay Mining and Smelting Co. Ltd.
Numéro: 949
Volume: 84
Année: 1991
Texte
Sommaire: Raise mining at the Namew Lake Nickel Mine in Manitoba uses 3 m diameter bored raises driven at 45 to 50 degrees dip for slope access and drilling. These raises are developed within the orebody on 20 m centres to accommodate electric-hydraulic longhole jumbos and charging wagons. Critical elements ofstope development include delineation of ore contacts, control of deviation during raise development, optimal slope sequencing to permit a high extraction rate, drill anchorage installation,...
Publication: CIM Bulletin
Auteur(s): D. Madsen, A. Moss, B. Salamondra, D. Etienne
Mots clés: Raise mining, Namew Lake mine, Nickel deposits, Manitoba.
Numéro: 949
Volume: 84
Année: 1991
Texte
Sommaire: In 1984, a provincial inquiry into ground control and emergency preparedness in Ontario mines was commissioned by the Minister of Labour for Ontario. One of the recommendations put forth by the committee conducting this inquiry was that the Ontario mining regulations be modified to address more effectively the assessment of mine design. Mining regulations now require that every mine in the province annually assess its design with respect to ground stability. Subsequently, the Ministry of...
Publication: CIM Bulletin
Auteur(s): R.J. Barclay, M.P. Kat
Mots clés: Rock mechanics, Ground control audits, Ontario mines, Safety.
Numéro: 949
Volume: 84
Année: 1991
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