Information Circular1950 - Mines and mineral resources |
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Page 4
... Fatalities and comparison of fatality rates based upon man - hours exposure in underground bituminous coal mines by employment groups ..... 8 . 7. Major disasters in bituminous - coal and anthracite mines during the fiscal year ended ...
... Fatalities and comparison of fatality rates based upon man - hours exposure in underground bituminous coal mines by employment groups ..... 8 . 7. Major disasters in bituminous - coal and anthracite mines during the fiscal year ended ...
Page 39
... fatalities in coal mines . Bureau of Mines engineers have studied roof - control measures whenever funds were available and have solved some special problems , such as that of " bumps . " However , no new roof - control methods that ...
... fatalities in coal mines . Bureau of Mines engineers have studied roof - control measures whenever funds were available and have solved some special problems , such as that of " bumps . " However , no new roof - control methods that ...
Page 39
... fatalities in coal mines . Bureau of Mines engineers have studied roof - control measures whenever funds were available and have solved some special problems , such as that of " bumps . " However , no new roof - control methods that ...
... fatalities in coal mines . Bureau of Mines engineers have studied roof - control measures whenever funds were available and have solved some special problems , such as that of " bumps . " However , no new roof - control methods that ...
Page 41
... fatalities in coal mines . Bureau of Mines engineers have studied roof - control measures whenever funds were available and have solved some special problems , such as that of " bumps . " However , no new roof - control methods that ...
... fatalities in coal mines . Bureau of Mines engineers have studied roof - control measures whenever funds were available and have solved some special problems , such as that of " bumps . " However , no new roof - control methods that ...
Page 44
... fatality rates based on man - hours of exposure in bituminous - coal and lignite mines ( see fig . 1 and tables 4 , 5 ... fatalities occurred ) that occurred in coal mines of the Nation during the fiscal year ended June 30 , 1949 , are ...
... fatality rates based on man - hours of exposure in bituminous - coal and lignite mines ( see fig . 1 and tables 4 , 5 ... fatalities occurred ) that occurred in coal mines of the Nation during the fiscal year ended June 30 , 1949 , are ...
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Common terms and phrases
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