Geostatistics and ore reserve classification

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Mots clés : Geostatistics;Ore reserves;Reserve classifications;McKelvey box;Estimation variances;Simulation
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Texte
Sommaire: A multipurpose program for a hand-held programmable 77-59 calculator and PC-100C printer facilitates the evaluation of various mineral processing tests and the calculation of mass and metal balances. Its application is demonstrated by some example problems. Detailed user instructions are given for each application.
Publication: CIM Bulletin
Auteur(s): OTTO ENGEL
Mots clés: Metallurgical evaluations, Mass balances, Calculators, Screen analyses, Flotation tests.
Numéro: 843
Volume: 75
Année: 1982
Texte
Sommaire: The authors describe the use of a computer system for the control of warehouse inventory at Cominco's Canadian operations. The challenge presented by the company's diverse products and various locations necessitated a practical approach to operational and manpower requirements. The utilization of modern forecasting techniques, manual intervention and exception reporting provides system flexibility. The system also provides both operational and management control to set required service goals...
Publication: CIM Bulletin
Auteur(s): K.B. HUSTWICK, J.W. MERKLEY, B.R. KRAUSE
Mots clés: Mine support, Inventory control, Computers, Cominco Ltd., Data processing, Forecasting, Monitoring, Purchase orders.
Numéro: 843
Volume: 75
Année: 1982
Texte
Sommaire: The decision to invest capital in developing a mine and constructing a mineral processing plant and services is usually made after a feasibility study shows that the estimated future cash flow from mine operations will yield an adequate return on the estimated capital expenditures.The actual return on investment may differ substantially from that estimated in the feasibility study, because of the probabilities of errors in estimating capital costs, ore reserves, operating costs, mineral...
Publication: CIM Bulletin
Auteur(s): T. ALAN O'HARA
Mots clés: Mineral economics, Mining projects, Risk analysis Investment, Cash flow, Probability curves, Simulation.
Numéro: 843
Volume: 75
Année: 1982
Texte
Sommaire: As an alternative to conventional dewatering by vacuum filtration and oil-fired rotary dryers, Brunswick Mining conducted extensive pilot-scale testwork on its copper, lead, zinc and bulk concentrates using a Larox Oy (Finland) automatic pressure filter. The results showed that pressure filtration readily produced final cake moistures of 6-8.5 per cent on this very fine sulphide material.An in-depth analysis examines pressure filtration in terms of metallurgical performance and projects...
Publication: CIM Bulletin
Auteur(s): J.E. NESSET
Mots clés: Mineral processing, Brunswick Mining, Concentrates, Filtration, Pressure filtration, Dewatering, Pumping, Pressing, Energy savings.
Numéro: 843
Volume: 75
Année: 1982
Texte
Sommaire: Overburden covering bedrock uranium deposits was sampled to depths of 29 m and Rn concentrations measured at the same depths. Total-alpha activities, U concentrations and Rn emanation (J) of the samples were measured. The U-flux into the overburden was greater in the past: oxidation and dissolution has since removed most U, leaving decay products which indicate the presence of U deposits when U itself does not. Distributions of U and decay products and their ratios to each other reflect...
Publication: CIM Bulletin
Auteur(s): R.H. McCORKELL, M.P. BRAMELD
Mots clés: Environmental control, Radon, Radioactive decay, Uranium deposits, Overburden, Decay products, Groundwater, Drilling, Cluff Lake, Amok deposit, Gooderham.
Numéro: 843
Volume: 75
Année: 1982
Texte
Sommaire: Throughout the history of Nova Scotia, trends in the production and use of its coal resources have resulted in major impacts on the economy and society of the province. Current trends in coal demand locally, nationally and internationally are having and will have an increasing positive effect on Nova Scotia over the next twenty years—in terms of energy supply, job creation and general economic development. Coal for electrical generation is an immediate and key objective of Nova Scotia's...
Publication: CIM Bulletin
Auteur(s): JOHN J. LAFFIN
Mots clés: Coal, Nova Scotia, Metallurgical coal, Electrical generation, Energy resources, Cape Breton Development Corporation, Novaco.
Numéro: 843
Volume: 75
Année: 1982
Texte
Sommaire: The paper describes the rapid development of, and operational experience in the utilization of, pneumatic low-pressure pipeline hoisting systems to vertically convey raw coal and rock through shafts, supplementing shaft capacity—the greatest lift to date being 535 m.A typical installation has raised over 250,000 tonnes in less than one year from a depth of 413 m through a 350/400-mm pipeline at a rate of 85 tonnes per hour. Operational experience on seven systems has provided valuable...
Publication: CIM Bulletin
Auteur(s): D.H. TWEEDY
Mots clés: Coal pipelining, Pipelines, Pneumatic conveying, Hoisting systems, Lyukobanya system.
Numéro: 843
Volume: 75
Année: 1982
Texte
Sommaire: During the past century, the development of vehicular transportation has benefitted tremendously from the performance improvement in engines in a situation where low-cost, plentiful fuel supplies were the order of the day. Engine advances were enhanced by and also dictated fuel modification to better adapt the energy source to the power plant.In discussing the several aspects of the change in approach from "an engine and its fuel to a fuel and its engine", the authors touch on the...
Publication: CIM Bulletin
Auteur(s): K.D. ENG, W.T. TIERNEY
Mots clés: Engines, Fuel, Combustion, Texaco Controlled Combustion System, Vehicles, Methanol, Brake performance.
Numéro: 843
Volume: 75
Année: 1982
Texte
Sommaire: The key words which characterize vanadium are: unlimited availability, versatility of applications and price stability.The supply of vanadium is assured by diversified sources, distributed all over the globe. The inexhaustible raw materials base is complemented by a strong vanadium industry. Both the fully integrated vanadium producers and converters of vanadium oxide or vanadium-containing slags or residues guarantee an adequate supply, commensurate with the steady growing demand.The major...
Publication: CIM Bulletin
Auteur(s): M.KORCHYNSKY
Mots clés: Vanadium, Mineral economics, Steel, Alloys, Production, Consumption, Markets.
Numéro: 843
Volume: 75
Année: 1982
Texte
Sommaire: In today's operating and investment climate, project evaluation is both more important and more difficult. It is more important because economic and financial analyses of a proposed project provide a basis for judgment of a project's commercial viability by equity participants, lenders and, in some cases, other participants such as offtakers and governments. It is more difficult because these analyses must, of necessity, be based on estimates, projections and evaluations which must be made in...
Publication: CIM Bulletin
Auteur(s): D.M. SLAVICH
Mots clés: Project evaluation, Mineral economics, Financing, Inflation, Foreign exchange, Cash flow, Profitability, Models.
Numéro: 843
Volume: 75
Année: 1982
Texte
Sommaire: A modified accumulator method was devised to measure surface radon flux from porous media. It consists of a collector hood type of accumulator with a homogenizer pump and a pressure balancer. The latter was used to compensate any pressure changes produced during sample withdrawal and hence eliminate additional radon transport from the media. Errors resulting from radon back diffusion due to decreasing concentration gradient with time across the interface were also eliminated by measuring...
Publication: CIM Bulletin
Auteur(s): N.K. DAVE, T.P. LIM
Mots clés: Environmental control, Radon flux, Accumulator methods, Uranium tailings, Porosity, Moisture content.
Numéro: 843
Volume: 75
Année: 1982
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