 ... or on the grate — may be very serious. It may not be extreme to suggest that this loss possibly amounts in certain cases to as much as that incurred through weathering in some of the subbituminous coals. UNDERGROUND WEATHERING. The analyses bear...  Bulletin of the United States Geological Survey - Page 284by Geological Survey (U.S.) - 1910Full view - About this book
 | Mines and mineral resources - 1909 - 1088 pages
...coals. UNDERGROUND WEATHERING. The analyses bear evidence, according to my tentative interpretation, that the phenomena of weathering are not confined to outcrops or shallow prospects. There are a number of coals in which I suspect oxygenation to have taken place to some extent in shallow... | |
 | David White - Coal - 1909 - 492 pages
...coals. UNDERGROUND WEATHERING. The analyses bear evidence, according to my tentative interpretation, that the phenomena of weathering are not confined to outcrops or shallow prospects. There are a number of coals in which I suspect oxygenation to have taken place to some extent in shallow... | |
 | Coal - 1910 - 216 pages
...field, Sweetwater County, Wyo. — Continued. ZONE OF UNDERGROUND WEATHERING. ZONE OF UNALTERED COAL. ZONE OF UNALTERED COAL. The coal samples collected...samples show to what extent underground weathering or oxygenation has been effective along mine openings, but practically no samples were collected to show... | |
 | Marius Robinson Campbell - Coal - 1910 - 616 pages
...field, Sweetcrater County, Wyo. — Continued. ZONE OF UNDERGROUND WEATHERING. ZONE OF UNALTERED COAL. ZONE OF UNALTERED COAL. The coal samples collected in 1907 clearly indicated that the phenomena of-weathering are not confined to outcrops or shallow prospects, but extend back considerable distances,... | |
 | Geology - 1909 - 1012 pages
...coals. UNDERGROUND WEATHERING. The analyses bear evidence, according to my tentative interpretation, that the phenomena of weathering are not confined to outcrops or shallow prospects. There are a number of coals in which I suspect oxygenation to have taken place to some extent in shallow... | |
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