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.

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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
Language [English]
Format Electronic
Electronic Document

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Note Cover title. "May, 1974." Digitized edition from print [produced by Natural Resources Canada].
Date 1974.
Number of Pages iv, 29, [2] p. :
Catalogue Number
  • M34-20/188E-PDF
Departmental Catalogue Number 300067
Subject Terms Mining industry, Statistics