Information Circular1950 - Mines and mineral resources |
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... UNITED STATES DEPARTMENT OF THE INTERIOR Oscar L. Chapman , Secretary US BUREAU OF MINES James Boyd , Director The Bureau of Mines will welcome reprinting of this paper , provided the following footnote acknowledgment is made ...
... UNITED STATES DEPARTMENT OF THE INTERIOR Oscar L. Chapman , Secretary US BUREAU OF MINES James Boyd , Director The Bureau of Mines will welcome reprinting of this paper , provided the following footnote acknowledgment is made ...
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... OF MINES RIOR APR 12.50 United States Department of the Interior March 1950 UNIV OF MICH igin 581C Bureau of Mines Information Circular 7560 EAST ENGIN. MINING METHODS AND COSTS AT THE HIGHLAND SURPRISE MINE, SHOSHONE COUNTY, IDAHO.
... OF MINES RIOR APR 12.50 United States Department of the Interior March 1950 UNIV OF MICH igin 581C Bureau of Mines Information Circular 7560 EAST ENGIN. MINING METHODS AND COSTS AT THE HIGHLAND SURPRISE MINE, SHOSHONE COUNTY, IDAHO.
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... THE USE OF DUST RESPIRATORS IN COAL MINES BY S. J. PEARCE APR 12 50 ARTMENT OF THE INTE 30 SAFETY BUREAU OF EFFICIENCY THE USE OF DUST RESPIRATORS IN COAL MINES BY S. United States Department of the Interior March 1950.
... THE USE OF DUST RESPIRATORS IN COAL MINES BY S. J. PEARCE APR 12 50 ARTMENT OF THE INTE 30 SAFETY BUREAU OF EFFICIENCY THE USE OF DUST RESPIRATORS IN COAL MINES BY S. United States Department of the Interior March 1950.
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... Circular 7561 THE USE OF DUST RESPIRATORS IN COAL MINES BY S. J. PEARCE DEPARTMENT OF THE INTERIOR SAFETY INDUSTRIES MINES JPR 12 50 THE USE OF DUST RESPIRATORS IN COAL MINES BY S. United States Department of the Interior March 1950.
... Circular 7561 THE USE OF DUST RESPIRATORS IN COAL MINES BY S. J. PEARCE DEPARTMENT OF THE INTERIOR SAFETY INDUSTRIES MINES JPR 12 50 THE USE OF DUST RESPIRATORS IN COAL MINES BY S. United States Department of the Interior March 1950.
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... United States " 2 / emphasize the fact that every effort should be made to keep the amount of dust in the air of the working places as small as possible : 2 Article VI , section lb. Where mining operations raise an excessive amount of ...
... United States " 2 / emphasize the fact that every effort should be made to keep the amount of dust in the air of the working places as small as possible : 2 Article VI , section lb. Where mining operations raise an excessive amount of ...
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13 north 37 south anthracite anthracite mines bituminous coal bituminous-coal and lignite blasting blends Bureau of Mines carbon dioxide carbon monoxide cars catalyst cent mines cent circuit coal bed Coal Mine Inspection coal mines coal-mine inspectors coke concentrate conditions and practices cost County cut and fill D.C. Approval drilling dust allaying electric engineers equipment explosions feet Figure fill stoping fire area fiscal year 1949 fuel gas mask gasification Gunnison County haulage high-volatile Highland Surprise holes hydrogen inches installed investigation Joy Manufacturing June 30 lignite lignite mines loading machine main east entry mechanical method mill mineral mines cent mines Mines Information Circular motor operations oxygen Per-No percent Pine Creek Pittsburgh plant Pocahontas portal properties reports respirators rock dust roof support samples seals shaft SHOSHONE COUNTY shrinkage stoping steel surface surface magazine switch synthesis gas tests timber tons Total tunnel Type underground ventilation volts zinc