Corporate considerations in mine decommissioning

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Mots clés : Mine management;Environmental concerns
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Texte
Sommaire: A market survey of all underground mines in Canada (Fig. 1) •
was completed to determine the extent to which cable bolts are being used as ground support. One hundred and nine questionnaires were distributed with 65% of them being returned completed. As a result, the quantity, types and locations of cable bolt installations have been determined. In addition, the grout pumps used, time required and cost of installations have been addressed. The popularity of other support types used in...
Publication: CIM Bulletin
Auteur(s): R. Poulin, R. Pakalnis, D. Peterson, J. Kalynchuk
Mots clés: Underground mining, Cable bolting, Rock mechanics.
Numéro: 989
Volume: 88
Année: 1995
Texte
Sommaire: The concept of risk is well established in the mining industry. It is acknowledged when estimates of reserves are expressed as proven or probable, when mining and metallurgical recoveries are applied to the ore, and when contingencies are added to costs. However, it is difficult to provide a quantitative assessment of risk. The significant sources of risk in a mineral project and how these are addressed in project evaluations are discussed.
The discount rate is examined as a fundamental means...
Publication: CIM Bulletin
Auteur(s): Lawrence Devon
Mots clés: Capital asset pricing model, Corporate cost of capital, Country risk, Discounted cash flow, Discount rate, Evaluation, Net present value, Real discount rate, Risk, Risk assessment, Risk factors.
Numéro: 989
Volume: 88
Année: 1995
Texte
Sommaire: Self-heating of broken sulphide ore or waste rock underground can lead to ignition and cause serious problems in a mine operation. An extensive study has demonstrated that it is caused by oxidation of certain species of pyrrhotite. Self-heating was found to take place in two stages, first progressing from ambient temperature to 100°
C with exothermic formation of elemental sulphur in the presence of moisture and oxygen, and proceeding to a second stage in which the sulphur oxidizes to...
Publication: CIM Bulletin
Auteur(s): F. Rosenblum, P. Spira
Mots clés: Safety, Sulphide ore,
Numéro: 989
Volume: 88
Année: 1995
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