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
... pressure made at two mines in the Coeur d'Alene min- ing district of northern Idaho . The simulation procedure , validated by field data , was used in an analytical study of vein - wall closure and sill - pillar stress as influenced by ...
... pressure made at two mines in the Coeur d'Alene min- ing district of northern Idaho . The simulation procedure , validated by field data , was used in an analytical study of vein - wall closure and sill - pillar stress as influenced by ...
Page 9
... pressures associated with the seventh- floor closure data shown in figure 6. The general agree- ment between measured and pre- dicted fill pressure as a function of time lends credence to the computer prediction technique . However , it ...
... pressures associated with the seventh- floor closure data shown in figure 6. The general agree- ment between measured and pre- dicted fill pressure as a function of time lends credence to the computer prediction technique . However , it ...
Page 14
... pressure psi stress psi 4 modulus maximum to maximum 3 36 - foot 16 - foot fill to closure pillar pillar Young's to ... pressure normal to the vein wall at mid - height of upper stope . 4Refers to stress acting normal to vein wall ...
... pressure psi stress psi 4 modulus maximum to maximum 3 36 - foot 16 - foot fill to closure pillar pillar Young's to ... pressure normal to the vein wall at mid - height of upper stope . 4Refers to stress acting normal to vein wall ...
Page 15
... pressure for · nonlinear fill . The nonlinear fill analy- sis most nearly represents realistic in - mine conditions . Evidence of this is presented in figures 12 and 13 , which show a comparison of actual field - measured and computer ...
... pressure for · nonlinear fill . The nonlinear fill analy- sis most nearly represents realistic in - mine conditions . Evidence of this is presented in figures 12 and 13 , which show a comparison of actual field - measured and computer ...
Page 3
... pressure . Test results showed an additional 40 ft is needed to raise the internal pressure to 12 inches water gage . STOPPING CONSTRUCTION AND LEAKAGE Four types of 12 - foot - diameter spheres were tested under Bureau of Mines ...
... pressure . Test results showed an additional 40 ft is needed to raise the internal pressure to 12 inches water gage . STOPPING CONSTRUCTION AND LEAKAGE Four types of 12 - foot - diameter spheres were tested under Bureau of Mines ...
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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.