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Electrothermal fracture of copper shale

Author: Carl F Wingquist; Robert A Lund; United States. Bureau of Mines.
Publisher: Washington : U.S. Dept. of the Interior, Bureau of Mines, 1976.
Series: United States.; Bureau of Mines.; Report of investigations - Bureau of Mines
Edition/Format:   Print book : National government publication : EnglishView all editions and formats
Database:WorldCat
Summary:
Electrical resistance heating to effect thermal fragmentation of semiconductive rock was examined by the Bureau of Mines. Tests were carried out on copper-bearing ores of the Nonesuch Shale Formation in the laboratory and in the field at White Pine, Mich. Fieldwork included primary and secondary breakage tests. Heating tests on in situ rock failed to produce thermal damage to an extent considered useful; however,  Read more...
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Additional Physical Format: Online version:
Wingquist, Carl F.
Electrothermal fracture of copper shale.
Washington : U.S. Dept. of the Interior, Bureau of Mines, 1976
(OCoLC)608736108
Online version:
Wingquist, Carl F.
Electrothermal fracture of copper shale.
Washington : U.S. Dept. of the Interior, Bureau of Mines, 1976
(OCoLC)609298764
Material Type: Government publication, National government publication
Document Type: Book
All Authors / Contributors: Carl F Wingquist; Robert A Lund; United States. Bureau of Mines.
OCLC Number: 2625593
Notes: Item 637-A.
Description: [3], 15 pages : illustrations ; 26 cm.
Series Title: United States.; Bureau of Mines.; Report of investigations - Bureau of Mines
Responsibility: by Carl F. Wingquist and Robert A. Lund ; Twin Cities Mining Research Center.

Abstract:

Electrical resistance heating to effect thermal fragmentation of semiconductive rock was examined by the Bureau of Mines. Tests were carried out on copper-bearing ores of the Nonesuch Shale Formation in the laboratory and in the field at White Pine, Mich. Fieldwork included primary and secondary breakage tests. Heating tests on in situ rock failed to produce thermal damage to an extent considered useful; however, boulders up to 30 ft³ were effectively broken by the method. Power input to the test rock was taken from a 50-kV, 5-amp dc power supply.

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