The Encyclopedia Americana: The International Reference Work, Volume 7Americana Corporation, 1955 - Encyclopedias and dictionaries |
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Page 151
has been confined largely to seams which , because of thinness or some other handicap , are not amen- able to pillar mining . Some of the more impor- tant factors that must be taken into consideration in choosing the method to be used ...
has been confined largely to seams which , because of thinness or some other handicap , are not amen- able to pillar mining . Some of the more impor- tant factors that must be taken into consideration in choosing the method to be used ...
Page 153
The hard labor required in hand mining , the hazards involved in shooting off the solid , and the low output per man have ... In other countries lower labor costs and unfavorable local conditions in the mines have prevented the use of ...
The hard labor required in hand mining , the hazards involved in shooting off the solid , and the low output per man have ... In other countries lower labor costs and unfavorable local conditions in the mines have prevented the use of ...
Page 654
The importance of the world's disseminated deposits is that despite their relatively low cop- per tenor , they are of such size that very large daily tonnages of ore can be mined at relatively low costs per ton as compared with the ...
The importance of the world's disseminated deposits is that despite their relatively low cop- per tenor , they are of such size that very large daily tonnages of ore can be mined at relatively low costs per ton as compared with the ...
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American army became British called carried cause cent century changes chief Church Civil clay Cleveland coal coast collection College colonies color Colorado comic command commerce continued countries early East effect England English established federal feet forces four France French given History House important increased industry interest internal Island Italy John June known land later less light London manufacturing March means ment miles mining natural North opened operation organized original Panama passed period plants practice present president published Railroad region result River separate served South studied temperature term tion town trade transportation Union United University usually various women York
Bibliographic information
| Title | The Encyclopedia Americana: The International Reference Work, Volume 7 The Encyclopedia Americana: The International Reference Work |
| Publisher | Americana Corporation, 1955 |
| Original from | University of Minnesota |
| Digitized | 5 Oct 2009 |
| Export Citation | BiBTeX EndNote RefMan |