Mining technology - statistics 1972 and 1973 developments / Amil Dubnie, Mining Research Centre. : M34-20/188E-PDF
“The tonnage of metallic ore mined underground in Canada decreased in 1972 while a corresponding increase took place in the tonnage mined from surface bringing the latter to 72% of the total. In the non-metallic less coal mine category, tonnages showed only a minor increase. In coal mines, the tonnage derived from surface increased, reaching 79% of the total for the group. During 1972, about 37% of underground metallic ore was mined by the cut-and-fill method or variations, followed by open stoping at 31%. The general trend of underground mining costs is up, while productivity has not shown a comparable rise. Costs and productivity in surface mines are holding approximately at previous levels. Promising advances in underground mining during 1973 were the use of a "roadheader" for mining without drilling and blasting under certain conditions, and the application of large-diameter holes to open stoping"--Summary, p. i.
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| Ministère/Organisme | Canada. Natural Resources Canada. Canada. Mines Branch. |
|---|---|
| Titre | Mining technology - statistics 1972 and 1973 developments / Amil Dubnie, Mining Research Centre. |
| Titre de la série | Technical bulletin ; TB 188 |
| Type de publication | Série - Voir l'enregistrement principal |
| Langue | [Anglais] |
| Format | Électronique |
| Document électronique | |
| Note(s) | Cover title. "May, 1974." Digitized edition from print [produced by Natural Resources Canada]. Includes summary in French. |
| Information sur la publication | Ottawa : Information Canada, 1974. |
| Auteur / Contributeur | Dubnie, Amil. |
| Description | iv, 29, [2] p. : chart |
| Numéro de catalogue |
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| Numéro de catalogue du ministère | 300067 |
| Descripteurs | Mining industry Statistics |