The guide to the evaluation of gold deposits: integrating deposit evaluation and reserve inventory practices

Abstract The Guide to the Evaluation of Gold Deposits reviews the successive evaluation steps in the domains of geology, engineering, and economics. The Guide analyzes, in a systemic perspective, the sequence of exploration, development, and evaluation work required to bring a mineral deposit to production. The aim is to identify the metal/mineralization losses and ore dilution that each work step contributes to the evaluation and mining process. The procedure allows one to maximize the income and profits of a mining operation, and to reduce the risks of financial losses tied to investment decisions in the mining sector. For greater efficiency, the criteria of reserve estimation and classification should be integrated with the evaluation steps and methods. At earlier stages of deposit development, when quantitative knowledge is available mainly on the geological axis, the term "delimited mineral deposit" should be used. The term "reserve" should be used only in an operating mine or in a mining project, when information in the geological, engineering, and economic domains is adequate to ensure technical and financial feasibility. "Reserves" are by definition "mining reserves". Each category of proven/probable reserves and measured/indicated deposits should be subdivided into two classes to express better the many steps of mineral valuation. The category of "possible reserves" shall be replaced by that of "inferred mineralization". This system, derived from the Australasian Code, can easily be integrated into current practices of the exploration and mining industry within a short timeframe. The proposal to develop the use of the margins of error of the estimates at a confidence level of 90% should be viewed in a longer timeframe. Establishing the precision of the mineral inventories and distinguishing between categories and classes by means of the margin of error will require more work and a longer break-in period.
Keywords: Exploration, Gold deposits.
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Summary: Responding to market developments, interest in locating deposits of wollastonite has grown significantly. The many occurrences in the Grenville marbles of Quebec can be grouped into disseminated-type and discordant vein-type deposits. Disseminated-type wollastonite occurrences have the disadvantages of lower grade, the need for more elaborate mineral separation, and failure to meet "long grain" technical specifications. Vein-type deposits have better grades and technical characteris...
Publication: CIM Bulletin
Author(s): Antoine Fournier, Karen St. Seymour
Keywords: Exploration, Geology, Wollastonite, Grenville marbles, Marbles, Industrial minerals.
Issue: 957
Volume: 85
Year: 1992
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Summary: This paper describes the use of Geographic Information Systems (CIS) as a tool for mineral exploration by using the Eskay Creek area of northern British Columbia as an example. Data entry, analysis and output are discussed. Examples of some of the capabilities of the technology are presented.
The main benefit of the technology is being able to perform complex and sophisticated searches of large and diverse data sets to highlight exploration targets. A GIS is a powerful data management tool...
Publication: CIM Bulletin
Author(s): Robert W. Plummer
Keywords: Computer applications, Geographic Information Systems, Exploration.
Issue: 957
Volume: 85
Year: 1992
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Summary: The Lindsley project was a program of deep drilling to test the contact down-dip from two nickel-copper deposits, one uneconomical and the other mined out. The role of Borehole Pulse EM (PEM) was to detect the higher grade, more massive sulphide zones if they were missed by a drillhole, and to help determine geometry if the zones were intersected. Two problems appeared as the PEM survey progressed: (1) conductivity-thickness as measured by the PEM did not always relate to economic sulphides...
Publication: CIM Bulletin
Author(s): D. Crone, T. Watts
Keywords: Exploration, Pulse EM surveys, Lindsley discovery, Falconbridge Ltd.
Issue: 957
Volume: 85
Year: 1992
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Summary: In most mineral processing operations the term "audit" is usually reserved for the exercise of checking financial records and/or safety practices. While these activities are time-consuming, no one disputes their necessity or value. If these areas are subjected to such careful scrutiny, why is it that the same principles are not normally applied to critically examine process operation. After all, the operating efficiency of the plant impacts directly on the measures of profitability....
Publication: CIM Bulletin
Author(s): Andrew J. Neale, Brian C. Flintoff
Keywords: Mineral processing, Plant audit.
Issue: 957
Volume: 85
Year: 1992
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Summary: The Arthur W. White Mine (formerly Dickenson Mine) is a structurally controlled, hydrothermal gold deposit. A gold producer since 1948, it has, to December 31, 1990, processed 6.9 million (m) tons (T) of ore grading 0.45 ounces per ton gold (oz/T Au). As of December 31, 1991, Proven and Probable Ore Reserves were 3.2 m. T. at 0.32 oz/T Au. The mine is located just east of Placer Dome Inc. 's Campbell Mine, within the Cochenour-Gullrock Lake deformation zone. It is situated on the hanging-wall...
Publication: CIM Bulletin
Author(s): J.A. Rogers
Keywords: Exploration, Arthur W. White mine, Red Lake, Dickenson Mines Ltd.
Issue: 957
Volume: 85
Year: 1992
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