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| 02154cam 2200325za 4500 |
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| 001 | 9.841727 |
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| 003 | CaOODSP |
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| 005 | 20221107152146 |
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| 007 | cr ||||||||||| |
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| 008 | 170816s1974 oncd os f000 0 eng d |
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| 040 | |aCaOODSP|beng |
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| 041 | |aeng|bfre |
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| 043 | |an-cn--- |
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| 086 | 1 |aM34-20/188E-PDF|zM34-20/188 |
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| 100 | 1 |aDubnie, Amil. |
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| 245 | 10|aMining technology - statistics 1972 and 1973 developments |h[electronic resource] / |cAmil Dubnie, Mining Research Centre. |
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| 260 | |aOttawa : |bInformation Canada, |c1974. |
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| 300 | |aiv, 29, [2] p. : |bchart |
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| 490 | 1 |aTechnical bulletin ; |vTB 188 |
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| 500 | |aCover title. |
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| 500 | |a"May, 1974." |
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| 500 | |aDigitized edition from print [produced by Natural Resources Canada]. |
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| 520 | |a“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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| 546 | |aIncludes summary in French. |
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| 692 | 07|2gccst|aMining industry |
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| 692 | 07|2gccst|aStatistics |
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| 710 | 1 |aCanada. |bNatural Resources Canada. |
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| 710 | 1 |aCanada. |bMines Branch. |
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| 830 | #0|aTechnical bulletin (Canada. Dept. of Energy, Mines and Resources. Mines Branch)|vTB 188|w(CaOODSP)9.834857 |
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| 856 | 40|qPDF|s1.52 MB|uhttps://publications.gc.ca/collections/collection_2017/rncan-nrcan/M34-20/M34-20-188-eng.pdf |
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