Information Circular1950 - Mines and mineral resources |
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Page
... Mechanical shovels load broken rock into side - dump cars at drift and crosscut headings . Trains of cars are hauled by electric locomotives to waste - ill raises or to waste loading pockets at the shaft , where the loads are dumped ...
... Mechanical shovels load broken rock into side - dump cars at drift and crosscut headings . Trains of cars are hauled by electric locomotives to waste - ill raises or to waste loading pockets at the shaft , where the loads are dumped ...
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... Mechanical and surface Total 503 503 439 1,445 1,987 2,100 2,035 6,122 2,040.67 Production in tons broken per man shift : 481.67 Ore breaking Development All mine employees 6.11 6.69 6.72 5.61 6.65 7.33 3.49 3.56 3.56 6.51 6.53 3.54 ...
... Mechanical and surface Total 503 503 439 1,445 1,987 2,100 2,035 6,122 2,040.67 Production in tons broken per man shift : 481.67 Ore breaking Development All mine employees 6.11 6.69 6.72 5.61 6.65 7.33 3.49 3.56 3.56 6.51 6.53 3.54 ...
Page
... Mechanical shovels load broken rock into side - dump cars at drift and . crosscut headings . Trains of cars are hauled by electric locomotives to waste - fill raises or to waste loading pockets at the shaft , where the loads are dumped ...
... Mechanical shovels load broken rock into side - dump cars at drift and . crosscut headings . Trains of cars are hauled by electric locomotives to waste - fill raises or to waste loading pockets at the shaft , where the loads are dumped ...
Page 5
... Mechanical shovels load broken rock into side - dump cars at drift and crosscut headings . Trains of cars are hauled by electric locomotives to waste - fill raises or to waste loading pockets at the shaft , where the loads are dumped ...
... Mechanical shovels load broken rock into side - dump cars at drift and crosscut headings . Trains of cars are hauled by electric locomotives to waste - fill raises or to waste loading pockets at the shaft , where the loads are dumped ...
Page 11
... Mechanical and surface Total 90 55 52 107 65.67 700 646 618 1,964 654.67 475 476 421 1,372 457.33 219 420 505 1,144 381.33 503 503 439 1,445 481.67 1,987 2,100 2,035 6,122 2,040.67 Production in tons broken per man shift : Ore breaking ...
... Mechanical and surface Total 90 55 52 107 65.67 700 646 618 1,964 654.67 475 476 421 1,372 457.33 219 420 505 1,144 381.33 503 503 439 1,445 481.67 1,987 2,100 2,035 6,122 2,040.67 Production in tons broken per man shift : Ore breaking ...
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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