Mining technology - statistics 1972 and 1973 developments: 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.
|Department/Agency||Natural Resources Canada. Mines Branch.|
|Title||Mining technology - statistics 1972 and 1973 developments|
|Series Title||Technical bulletin ;|
|Publication Type||Series - View Master Record|
|Electronic Document|| |
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|Note||Cover title. "May, 1974." Digitized edition from print [produced by Natural Resources Canada].|
|Number of Pages||iv, 29,  p. :|
|Departmental Catalogue Number||300067|
|Subject Terms||Mining industry, Statistics|
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