Information Circular1950 - Mines and mineral resources |
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... iron range of Michigan .. Determination of incombustible material in coal - mine dusts .. ยท Determination of mercury in crude oil . Approval testing of respiratory protective devices ... Approvals and extensions of approvals granted ...
... iron range of Michigan .. Determination of incombustible material in coal - mine dusts .. ยท Determination of mercury in crude oil . Approval testing of respiratory protective devices ... Approvals and extensions of approvals granted ...
Page 1
... iron range of Michigan .. .. Determination of incombustible material in coal - mine dusts ... Determination of mercury in crude oil ... Approval testing of respiratory protective devices ... Approvals and extensions of approvals granted ...
... iron range of Michigan .. .. Determination of incombustible material in coal - mine dusts ... Determination of mercury in crude oil ... Approval testing of respiratory protective devices ... Approvals and extensions of approvals granted ...
Page 8
... iron - orc tailings for this purpose at a mine in West Virginia , but the study has not progressed far enough to warrant definite conclusions . Other materials , such as metallurgical slags and certain minerals that might have ...
... iron - orc tailings for this purpose at a mine in West Virginia , but the study has not progressed far enough to warrant definite conclusions . Other materials , such as metallurgical slags and certain minerals that might have ...
Page 10
... Iron Range of Michigan Carbonaceous shales encountered in mining in the Menominee iron range of Michigan sometimes heat spontaneously , requiring sealing - off of the affected areas to exclude oxygen . Studies have been under way to ...
... Iron Range of Michigan Carbonaceous shales encountered in mining in the Menominee iron range of Michigan sometimes heat spontaneously , requiring sealing - off of the affected areas to exclude oxygen . Studies have been under way to ...
Page 55
... Iron . Type of disaster Explosion Explosion Fatalities 13 Date 7/27/48 .. King 7/30/48 ... Edgewater 8/6/48 ...... Berwind No. 11 11/4/48 ..... Nethken & Railroad Company . New River & Pocahontas Consolidated Coal Co. Alabama 11 . W ...
... Iron . Type of disaster Explosion Explosion Fatalities 13 Date 7/27/48 .. King 7/30/48 ... Edgewater 8/6/48 ...... Berwind No. 11 11/4/48 ..... Nethken & Railroad Company . New River & Pocahontas Consolidated Coal Co. Alabama 11 . W ...
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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