Case history of Borehole Pulse EM surveys at the Falconbridge Lindsley discovery in Sudbury

Abstract 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 as determined by the market; (2) a pattern of unusual PEM anomalies was obtained that indicated something odd and big, but the cause was unknown. A large fold structure subsequently was indicated by a program of deepening previous holes, the third of which intersected high-grade mineralization below 1280 m. Falconbridge is in the process of shaft sinking and underground exploration.
Keywords: Exploration, Pulse EM surveys, Lindsley discovery, Falconbridge Ltd.
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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 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...
Publication: CIM Bulletin
Author(s): Marcel Vallee, Denis Cote
Keywords: Exploration, Gold deposits.
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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