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Electrothermal Fracture of Copper Shale.

Authors
Wingquist-CF; Lund-RA
Source
NTIS: PB 251 990 :15 pages
Link
NIOSHTIC No.
10007624
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, Michigan. 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.
Publication Date
19760101
Document Type
IH; Report of Investigation;
Fiscal Year
1976
NTIS Accession No.
PB-251990
NTIS Price
A03
Identifying No.
RI 8106
Source Name
NTIS: PB 251 990
State
MI;
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