Information Circular1950 - Mines and mineral resources |
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... samples Gas analyses . Dust analyses . Field investigations .. Laboratory investigations .. Page 5 • • 5 6 6 7 7 7 8 8 ... 8 9 9 Determination of dust concentration .. Determination of composition of dust . Rock structure as related to ...
... samples Gas analyses . Dust analyses . Field investigations .. Laboratory investigations .. Page 5 • • 5 6 6 7 7 7 8 8 ... 8 9 9 Determination of dust concentration .. Determination of composition of dust . Rock structure as related to ...
Page 1
... samples . Gas analyses .. Dust analyses . Field investigations .. Laboratory investigations Determination of dust concentration . ... Determination of composition of dust . Rock structure as related to roof control ... Investigations ...
... samples . Gas analyses .. Dust analyses . Field investigations .. Laboratory investigations Determination of dust concentration . ... Determination of composition of dust . Rock structure as related to roof control ... Investigations ...
Page 6
... SAMPLES During the fiscal year approximately 16,000 gas and dust samples wero analyzed , which required more than 100,000 determinations . Gas Analys es The gas laboratory analyzed 15,729 samples , 3643 - 6 -
... SAMPLES During the fiscal year approximately 16,000 gas and dust samples wero analyzed , which required more than 100,000 determinations . Gas Analys es The gas laboratory analyzed 15,729 samples , 3643 - 6 -
Page 7
... samples analyzed and an increase of 14.0 percent in the number of samples analyzed in connection with coal - mine inspections . Samples collected during inspections of anthracite and bituminous coal mines constituted the major part of ...
... samples analyzed and an increase of 14.0 percent in the number of samples analyzed in connection with coal - mine inspections . Samples collected during inspections of anthracite and bituminous coal mines constituted the major part of ...
Page 8
... sampling of air - borne dus ts , performance characteristics of gas - indicating instruments , toxic gases liberated in ... samples of air - borne dust for particle - size determin- ation and X - ray , spectrographic , and petrographic ...
... sampling of air - borne dus ts , performance characteristics of gas - indicating instruments , toxic gases liberated in ... samples of air - borne dust for particle - size determin- ation and X - ray , spectrographic , and petrographic ...
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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