The Encyclopedia Americana, Volume 7Grolier, 1994 - Encyclopedias and dictionaries |
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Page 137
RECOVERABLE COAL RESOURCES Soviet Union ( Mapped and explored ) Percent of world total In billion metric tons 2,950 68.5 % North America 780 18.1 United States 710 16.5 Europe 280 Asia 225 5.2 Africa 35 0.8 25 0.6 10 0.2 100.0 Oceania ...
RECOVERABLE COAL RESOURCES Soviet Union ( Mapped and explored ) Percent of world total In billion metric tons 2,950 68.5 % North America 780 18.1 United States 710 16.5 Europe 280 Asia 225 5.2 Africa 35 0.8 25 0.6 10 0.2 100.0 Oceania ...
Page 142
The increasing refuse that accompanies mechanization requires the processing of coal to satisfy large - scale , discriminating buyers . Cleaning plants as adjuncts to the larger mines processed two thirds of the U. S. output in 1965 .
The increasing refuse that accompanies mechanization requires the processing of coal to satisfy large - scale , discriminating buyers . Cleaning plants as adjuncts to the larger mines processed two thirds of the U. S. output in 1965 .
Page 144
144 UNDERGROUND GASIFICATION OF COAL The United States , Britain , and the Soviet Union have made tests to gasify coal under- ground to obtain a low - Btu gas . In this ap- proach , input- and output - bore holes are drilled down to a ...
144 UNDERGROUND GASIFICATION OF COAL The United States , Britain , and the Soviet Union have made tests to gasify coal under- ground to obtain a low - Btu gas . In this ap- proach , input- and output - bore holes are drilled down to a ...
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