Lost a drill hole recently?: M38-8/128E-PDF

“Spotting a drill hole and making the necessary calculations for it to hit target is easily enough done but all too often that hole can go astray in the drilling and many expensive, frustrating and sometimes fruitless hours can be spent looking for it. Until recent years the only way of locating the hole was by listening for the sound of the bit in the target area. At best never a reliable method. Then an inventive team at Inco perfected an electromagnetic hole finder that depending on strength, can locate holes several hundred feet away. Requests from various mines for information on the subject have come into the Mines Branch at Ottawa and a team of research scientists, R. Tervo and L. Tirrul were 'assigned to the case’. The following is a description of their findings on the hole finder and a complete and thorough explanation of its working. A do-it-yourself kind of operation that could prove to be manna from heaven for frustrated drill captains everywhere"--p. 58.

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Department/Agency Natural Resources Canada. Dept. of Energy, Mines and Resources. Mines Branch.
Title Lost a drill hole recently?
Series Title Reprint series ;
Publication Type Series - View Master Record
Language [English]
Format Electronic
Electronic Document

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Note Cover title. "Reprinted from Canadian Mining Journal, vol. 95, no. 3, March 1974, pp. 53, 54 and 58." Historical publication digitized from print 2017 [by Natural Resources Canada].
Date 1974.
Number of Pages p. 53-58 :
Catalogue Number
  • M38-8/128E-PDF
Departmental Catalogue Number 300207
Subject Terms Mining industry, Drilling