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Tests of drill hole methods of geophysical prospecting on the property of Lake Dufault mines Limited, Dufresnoy Township, Quebec


, : Tests of drill hole methods of geophysical prospecting on the property of Lake Dufault mines Limited, Dufresnoy Township, Quebec. Pages 206-226 1966

The new Lake Dufault massive sulfide ore body, which was discovered by diamond drilling in 1961, lies at depths of between 1,000 and 1,400 feet below the surface. It provides a good measuring rod for testing the techniques of drill-hole geophysics. During 1962 a series of tests was carried out, using several geophysical methods. Results show that any one of these methods would have detected the presence of the ore body, from a drill hole within 125 feet of its margin. None of the methods is foolproof. The most difficult problem is to determine the direction of the ore body with respect to the hole surveyed. Also, as indicated by follow-up surveys, conductors of unknown substance may produce anomalies comparable to those resulting from a million ton body of massive sulfides.

US$29.90


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