Canadian taxation of mining industrial minerals

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Texte
Sommaire: This paper compares a number of operating conventional and semi-autogenous grinding circuits and analyzes them in regard to operating and capital costs, specifically as applied to porphyry copper ores.
Publication: CIM Bulletin
Auteur(s): DEREK J. BARRATT
Mots clés: Equipment, Grinding, Milling costs, Porphyry ores, Afton Mines, Island Copper Mines, Lornex Mining Corporation, Similkameen Mining Company, Pima Mining Company.
Numéro: 811
Volume: 72
Année: 1979
Texte
Sommaire: There is a difference in design parameters between steel linings and rubber linings for grinding mills. The basic design parameters for rubber are described and a comparison is made between steel and rubber in different applications.
Publication: CIM Bulletin
Auteur(s): GUSTAV NILLSON
Mots clés: Equipment, Maintenance, Linings, Rubber linings, Grinding mills, Mill linings, Impact grinding, Attrition grinding, Abrasion grinding.
Numéro: 811
Volume: 72
Année: 1979
Texte
Sommaire: In conjunction with the over-all goals of energy conservation at Inco Metals Company, a program of improvement in compressed air utilization was established. Air flows were monitored and compared to calculated requirements to establish efficiency by area. With the cooperation of area management, measures were implemented to reduce nonproductive usage.At the operation, annual savings in power consumption alone were 80,000 dollars. The program is being extended to other mine areas within the...
Publication: CIM Bulletin
Auteur(s): J. G. CULLAIN
Mots clés: Equipment, Maintenance, Energy conservation, Inco Metals Company, Underground mining, Compressed air, Air flow, Power consumption, Levack Mine, Annubar, Compressors.
Numéro: 811
Volume: 72
Année: 1979
Texte
Sommaire: The paper uses two hypothetical, but typical, situations to show that hydraulic rock drilling equipment has very significant economic advantages over pneumatic equipment both in drifting applications (even in the situation where advantage is not taken of the high productive capacity of the hydraulic drill) and production drilling applications.Other factors, including the non-economic advantages and the disadvantages of hydraulic drilling, are discussed. The paper concludes with a brief...
Publication: CIM Bulletin
Auteur(s): R.G. BRADBURY
Mots clés: Equipment, Maintenance, Drilling, Hydraulic drilling, Drifting, Tunnelling, Cost factors.
Numéro: 811
Volume: 72
Année: 1979
Texte
Sommaire: This paper explores the financial impact of the initial version of the Saskatchewan Potash Reserve Tax; first, alone; and second, in conjunction with the other taxes affecting the industry's profitability. Although the introduction of the Reserve Tax is shown to lead to a substantial increase in a hypothetical firm's effective tax burden, the more unusual outcomes frequently attributed to this levy only occur after the imposition of other non-provincial tax rulings. Despite this qualification...
Publication: CIM Bulletin
Auteur(s): DAVID L ANDERSON
Mots clés: Taxation, Reserve taxes, Potash industry, Saskatchewan, Mining costs, Markets.
Numéro: 811
Volume: 72
Année: 1979
Texte
Sommaire: Demands for increased grinding production, lower-grade ore and limited capital have resulted in ever larger grinding mills, some as large as 36ft (11 m) in diameter and 12,000 hp (8,950 kw). The result is often fewer machines per plant, with a greater dependence on each machine. To meet these reliability requirements, manufacturers of mills, drives, castings and other components have had to be innovative and creative in their design. Only by thorough review of past designs and practices and...
Publication: CIM Bulletin
Auteur(s): C. A. ROLOFF
Mots clés: Equipment, Maintenance, Milling, Grinding mills, Feeders, Trunnions, Mill heads, Lubrication, Mill shells, Mill drives, Drive trains, Motors, Cascading.
Numéro: 811
Volume: 72
Année: 1979
Texte
Sommaire: The construction, commissioning and operation of a continuous pilot-scale selective agglomeration (oil agglomeration) unit are described. This plant has been used to recover fine coal from an effluent stream that is produced by a jig plant which scalps the coal from a New South Wales (Australia) colliery. The reject slurry is extremely fine (66.5% minus 53 pm) and has an ash content of approximately 40%. The pilot plant can treat up to 0.3 tonne/h of this slurry, producing average product...
Publication: CIM Bulletin
Auteur(s): L.W. ARMSTRONG
Mots clés: Coal treatment, Effluents, Agglomeration, Selective agglomeration, Environmental control, Tailings.
Numéro: 811
Volume: 72
Année: 1979
Texte
Sommaire: Both the B and A-C ore zones of the Heath Steele Mine contain extensive areas of brecciated ore. This texturally distinct ore type has been tentatively defined as a fragmental or conglomerate massive sulphide.It consists of subangular and round fragments of pyrite up to 30 cm in diameter, smaller quartz clasts and chloritized, mineralized, lithic fragments in a faintly banded matrix ofpyr-rhotite and chalcopyrite. The chalcopyrite is concentrated in the pressure shadows of the fragments and...
Publication: CIM Bulletin
Auteur(s): LEO OWSIACKI, A.L McALLISTER
Mots clés: Massive sulphides, Breccia ore, Sediment slumping, Heath Steele Mine, Mineralization, Ore deposits, Deformation, Metamorphism.
Numéro: 811
Volume: 72
Année: 1979
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