Corporate considerations in mine decommissioning

Abstract
The decision to proceed with mine decommissioning, generally involves a number of complex and independent factors. These factors, including potential for re-opening, legal requirements, contingent liability, asset depreciation, due diligence, and public relations are discussed in the context of the financial implications on a net-present-value basis. It is concluded that the decision to delay mine decommissioning is commonly not in the best financial interests of the mine operator. Some measures to reduce decommissioning costs and expedite the process are presented.
Keywords: Mine management, Environmental concerns, Decommissioning.
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Summary: 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
Author(s): R. Poulin, R. Pakalnis, D. Peterson, J. Kalynchuk
Keywords: Underground mining, Cable bolting, Rock mechanics.
Issue: 989
Volume: 88
Year: 1995
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Summary: 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
Author(s): Lawrence Devon
Keywords: 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.
Issue: 989
Volume: 88
Year: 1995
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Summary: 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
Author(s): F. Rosenblum, P. Spira
Keywords: Safety, Sulphide ore,
Issue: 989
Volume: 88
Year: 1995
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