Information Circular1950 - Mines and mineral resources |
From inside the book
Results 1-5 of 100
Page
... shown in figure 7. Ore is crushed and screened ; screen oversize is reduced in a 3 - foot cone , the product from which returns to the screen ; screen undersize goes to a crushed - ore bin , from which two ball mills are fed . A duplex ...
... shown in figure 7. Ore is crushed and screened ; screen oversize is reduced in a 3 - foot cone , the product from which returns to the screen ; screen undersize goes to a crushed - ore bin , from which two ball mills are fed . A duplex ...
Page
... shown in figure 7. Ore is crushed and screened ; screen oversize is reduced in a 3 - foot cone , the product from which returns to the screen ; screen undersize goes to a crushed - ore bin , from which two ball mills are fed . A duplex ...
... shown in figure 7. Ore is crushed and screened ; screen oversize is reduced in a 3 - foot cone , the product from which returns to the screen ; screen undersize goes to a crushed - ore bin , from which two ball mills are fed . A duplex ...
Page 1
... shown in figure 7. Ore is crushed and screened ; screen oversize is reduced in a 3 - foot cone , the product from which returns to the screen ; screen undersize goes to a crushed - ore bin , from which two ball mills are fed . A duplex ...
... shown in figure 7. Ore is crushed and screened ; screen oversize is reduced in a 3 - foot cone , the product from which returns to the screen ; screen undersize goes to a crushed - ore bin , from which two ball mills are fed . A duplex ...
Page 19
... shown in 199 exhibitions , attended by 10,765 persons employed in or associated with the mineral industries . To June 30 , 1949 , Safety Branch motion pictures have been shown 2,854 times to a total of 251,687 persons . Fourteen copies ...
... shown in 199 exhibitions , attended by 10,765 persons employed in or associated with the mineral industries . To June 30 , 1949 , Safety Branch motion pictures have been shown 2,854 times to a total of 251,687 persons . Fourteen copies ...
Page 44
... shown graphically in figure 5. Federal coal - mine inspection reports indicate disaster hazards in existence in many coal mines , particularly in those employing fewer than 25 men . However , the reports also establish proof that ...
... shown graphically in figure 5. Federal coal - mine inspection reports indicate disaster hazards in existence in many coal mines , particularly in those employing fewer than 25 men . However , the reports also establish proof that ...
Other editions - View all
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