Tax Incentives — Or Tax Problems?

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Publication: CIM Bulletin
Auteur(s): Carol A. Pilon
Numéro: 777
Volume: 70
Année: 1977
Texte
Sommaire: This paper provides a rough outline of economic expectations for the near future and then goes on to discuss their effect on the expected demand for metals, using zinc, copper, nickel and aluminum as detailed examples.
Publication: CIM Bulletin
Auteur(s): A. G. B. Hayes, C. L. Renzoni
Mots clés: Mineral economics, Metal markets, Markets, Zinc, Copper, Nickel, Aluminum, Production.
Numéro: 777
Volume: 70
Année: 1977
Texte
Sommaire: The consistent relationship between the availability of electrical energy and our economic well-being is well known. As we develop the energy we need to nurture industrial civilization in decades ahead, we will at the same time reduce our reliance on dwindling supplies of oil and gas. Coal and uranium will be developed as our major fuel sources to meet medium-term energy needs, followed by fusion and solar energy for the long term.
Publication: CIM Bulletin
Auteur(s): George Wilkinson
Mots clés: Electricity, Energy, Nuclear energy, Fuels, Coal, Oil, Natural gas, Heat pumps, CANDU reactors, Westinghouse Canada.
Numéro: 777
Volume: 70
Année: 1977
Texte
Sommaire: Sherritt has been applying hydraulic drives to concentrator equipment since 1967. The initial application was made on a bank of 5- by 5-in. slurry pumps. This has now been extended to all slurry pumps requiring less than 40 hp and several conveyors which require variable-speed or low-speed/high-torque characteristics. The pump motors are directly connected through a flexible coupling, whereas the conveyor systems are directly mounted onto the head-pulley shaft extension.
The different...
Publication: CIM Bulletin
Auteur(s): L. H. Smith, D. S. Taylor
Mots clés: Hydraulic drives, Maintenance, Concentrators, Slurry pumps, Conveyors, Ruttan Mine, Lynn Lake Mine, Fox Mine, Sherritt Gordon Mines Limited.
Numéro: 777
Volume: 70
Année: 1977
Texte
Sommaire: Currently installed analogue instrumentation devices at Sherritt's Ruttan Concentrator control and/or measure mill tonnages, grind, pH, density, some reagent and slurry flows, and cell levels. On-stream analysis is used to assay the main process streams. The history of development of process control is reviewed from startup to the present stage of selection of a process control computer. A pragmatic approach has been taken to process control to ensure compatibility with the needs and...
Publication: CIM Bulletin
Auteur(s): G. M. Hughes, R. W. Dunn
Mots clés: Process control, Computers, Sherritt Gordon Mines Ltd., Ruttan concentrator, Concentrators, Crushing, Grinding, Flotation, Dewatering.
Numéro: 777
Volume: 70
Année: 1977
Texte
Sommaire: Measurement and control systems in minerals processing plants are usually well thought out and designed. The criteria and design parameters have been interpreted correctly.
However, these systems often fail to perform, satisfactorily or break down altogether as a result of in-plant conditions which are unpredictable and over which the instrument systems designer has no direct control. The foresight necessary to anticipate the problems and allow for them in the systems design can only be...
Publication: CIM Bulletin
Auteur(s): G. M. Behrend
Mots clés: Plant engineering, Maintenance, Installation, Mineral processing plants, Control systems, Flow measurements, Weight measurements, Level measurements, Temperature measurements.
Numéro: 777
Volume: 70
Année: 1977
Texte
Sommaire: The basic intention of this paper is to present, from a practical viewpoint, a thorough outline of all the sound and accepted principles connected with attaining satisfactory rope performance from multi-rope friction winders.
In order to emphasize the importance of some aspects of rope maintenance, a limited amount of hoist rope theory has been included, as it is felt that without this, some of the more critical, but nevertheless practical, aspects would perhaps pass without full appreciation...
Publication: CIM Bulletin
Auteur(s): George Delorme
Mots clés: Maintenance, Rope maintenance, Friction hoists, Hoist ropes, Balance ropes, Guide ropes, Rope handling.
Numéro: 777
Volume: 70
Année: 1977
Texte
Sommaire: The Cargill phosphate deposit, located 32 kilometers southwest of Kapuskasing, Ontario, was discovered by the Resource Development Group of International Minerals & Chemical Corporation in 1975 and has been evaluated through an extensive program of 190 drill holes, numerous chemical analyses, metallurgical tests, and engineering and economic studies.
The Cargill alkalic complex, comprising principally carbonatite and pyroxenite-amphibolite rocks, was intruded into the rift system, of the...
Publication: CIM Bulletin
Auteur(s): George Erdosh
Numéro: 777
Volume: 70
Année: 1977
Texte
Sommaire: The Sustut Copper deposit, 230 miles northwest of Prince George, B.C., was discovered in August of 1971. Subsequent exploration has included 56,417 feet of surface diamond drilling in 139 holes. The deposit occurs in gently dipping volcanic rocks of the Upper Triassic Takla Group, which outcrops as rugged mountains.
The general Mesozoic sequence comprises some 20,000 feet of green and red basaltic to andesitic rocks. The Lower Formation is characterized by subaqueous basalt, andesite and...
Publication: CIM Bulletin
Auteur(s): G. Harper
Mots clés: Sustut, Copper, British Columbia, Exploration, Volcanic succession, Folding, Faulting, Alteration, Strata-bound deposits, Ore genesis.
Numéro: 777
Volume: 70
Année: 1977
Texte
Sommaire: Des quartzites ires purs ont ete decouverts au cours de la cartographic de la region du lac des Martres, etape de I'etude geologique de la region de Charlevoix.
On distingue quatre groupes metasedimentaires, lous contenant des niveaux de quartzite dans au mains deux domaines geologiques differents, c'est a I'ouest, dans le do-maine gneisso-charnockitique que se situent les quartzites du groupe des Martres. Quartzite et gneiss a grenat et sillimanite, en banes epais, constituent la formation...
Publication: CIM Bulletin
Auteur(s): Jehan Rondot, Raymond Marieau
Mots clés: Silice, Charlevoix, Quartzites, La Galette, Géologie économique, Malbaie, Minéraux industriels
Numéro: 777
Volume: 70
Année: 1977
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