Mining technology in 1974 / R. J. R. Welwood.: M38-13/76-29E-PDF
"The tonnage of metallic ore mined underground in Canada decreased slightly to 64.4 million tons in 1974 from 65.5 million tons in 1973, a decrease of 1.7%. An increase of less than 1% in surface-mined ore brought the total from surface operations to 239.7 million tons, i.e. approximately 79% of the total metallic ore mined in Canada. In the non-metallic mines, there was a 10.6% increase from underground, largely owing to increased production of potash. A minor increase occurred in surface-mined non-metallic ores. During 1974, approximately 40% of the metallic underground ore was mined by cut and fill methods or variations, followed by open stoping with about 36%. The tons mined by other underground methods were slightly reduced. Sharp rises in underground mining costs are noted for 1974. This trend is expected to continue at a high rate in 1975. Surface mining costs in general showed only slight increases"--Summary, p. i.
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| Department/Agency | Canada. Energy, Mines and Resources Canada. |
|---|---|
| Title | Mining technology in 1974 / R. J. R. Welwood. |
| Series title | CANMET report ; 76-29E |
| Publication type | Series - View Master Record |
| Language | [English] |
| Format | Electronic |
| Electronic document | |
| Note(s) | Cover title. "September 1976." Includes bibliographic references. Includes summary in French. |
| Publishing information | [Ottawa] : Energy, Mines and Resources Canada, 1976. |
| Author / Contributor | Welwood, R. J. R. |
| Description | iii, 36 p. : figures. |
| Catalogue number |
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| Subject terms | Mining technology |
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