Information Circular1950 - Mines and mineral resources |
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... face is drilled according to the judgment of the miner ; the round , however , must be effective . Holes are loaded with gelatin dynamite rated 40 percent strength . Mechanical shovels load broken rock into side - dump cars at drift and ...
... face is drilled according to the judgment of the miner ; the round , however , must be effective . Holes are loaded with gelatin dynamite rated 40 percent strength . Mechanical shovels load broken rock into side - dump cars at drift and ...
Page 3
... face of the wearer , and a filter or set of filters , which removes dust from the air drawn through it as the wearer inhales . The facepiece is held in place on the wearer's face by elastic headbands . Air , which the wearer exhales ...
... face of the wearer , and a filter or set of filters , which removes dust from the air drawn through it as the wearer inhales . The facepiece is held in place on the wearer's face by elastic headbands . Air , which the wearer exhales ...
... face of the wearer and if they are properly maintained . The user should read and follow the manufacturer's instructions on the respirator container . These instructions give such details as positioning the respirator on the face ...
Page 6
... face . Some types of rubber deteriorate rapidly if not cleaned frequently and thoroughly . The facepiece should be disinfected once a week by a method recommended by the manufacturer of the respirator . If the respirator is to be used ...
... face . Some types of rubber deteriorate rapidly if not cleaned frequently and thoroughly . The facepiece should be disinfected once a week by a method recommended by the manufacturer of the respirator . If the respirator is to be used ...
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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