Report of InvestigationsU.S. Department of the Interior, Bureau of Mines, 1919 - Mineral industries |
From inside the book
Results 1-5 of 100
Page 1
... reduction in pillar stress from that of the open stope . A 100 - ksi - modulus fill reduces pillar stress in both the 36 - foot and 16 - foot pillars ( vein width is 10 feet ) by about 50 percent relative to the open stope ...
... reduction in pillar stress from that of the open stope . A 100 - ksi - modulus fill reduces pillar stress in both the 36 - foot and 16 - foot pillars ( vein width is 10 feet ) by about 50 percent relative to the open stope ...
Page 2
... reduced timber requirements , improved ground control , improved mine ventilation , reduced ore dilution , and underground disposal of waste material . In order to realize the potential advantages of hydraulic fill , it is necessary to ...
... reduced timber requirements , improved ground control , improved mine ventilation , reduced ore dilution , and underground disposal of waste material . In order to realize the potential advantages of hydraulic fill , it is necessary to ...
Page 7
... reduced to correspond to to mine behavior . One approach ( 18 ) to estimating the proper reduction used in slope stability problems and applicable to this problem was developed by Pariseau and Stout ( 18 ) . In brief , the method ...
... reduced to correspond to to mine behavior . One approach ( 18 ) to estimating the proper reduction used in slope stability problems and applicable to this problem was developed by Pariseau and Stout ( 18 ) . In brief , the method ...
Page 8
... reduction factor of 10 was determined . However , to predict the support performance of hydraulic backfill for more ... reduced until measured stope closures were approxi- mated by the computer analyses , a direct comparison of measured ...
... reduction factor of 10 was determined . However , to predict the support performance of hydraulic backfill for more ... reduced until measured stope closures were approxi- mated by the computer analyses , a direct comparison of measured ...
Page 11
... reduce pillar strength and modulus , but there is no assur- ance that the potential for bursting will also be reduced . Quite the opposite could result . The total problem is a complicated one and needs serious study . Figure 10 shows ...
... reduce pillar strength and modulus , but there is no assur- ance that the potential for bursting will also be reduced . Quite the opposite could result . The total problem is a complicated one and needs serious study . Figure 10 shows ...
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Popular passages
Page 3 - An acid plant was installed in 1929 to treat •Underlined numbers in parentheses refer to items in the list of references at the end of this report.
Page 3 - Needless to say, this contractor did not submit a bid. "(10) (Reference to specific trade names is made for identification only and does not imply endorsement by the Bureau of Mines...
Page 10 - API, is pumped to storage. 3Reference to specific makes or models of equipment is made to facilitate understanding and does not imply endorsement by the Bureau of Mines.
Page 11 - Haynes, WP, JJ Elliott, AJ Youngblood, and AJ Forney. Operation of a Sprayed Raney Nickel Tube-wall Reactor for Production of a High-Btu Gas.
Page 34 - Prediction of Laminar Flow and Heat Transfer in Helically Coiled Pipes,
Page 9 - Kissell, FN. CM McCulloch, and CH Elder. The Direct Method of Determining Methane Content of Coalbeds for Ventilation Design.