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- Tasks and activities:
- Mine design
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Results 51 - 55 of 55
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1/1/1992 - Reports of InvestigationsThe Bureau of Mines developed a computerized method to calculate vertical stress exerted on surfaces at depth that includes the effect or topography. The limitation of the method is that stresses cannot be accurately determined near an outcrop.
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1/1/1992 - Reports of InvestigationsResearchers monitored rock mass response to mining of an experimental underhand longwall stope in Hecla Mining Company's Lucky Friday Mine, Mullan, Idaho. This is part 1 of 3.
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1/1/1987 - Reports of InvestigationsThree possible limited-coverage design scenarios (roll bars, sliding canopies, and flip-top canopies) were designed, fabricated, and evaluated for low-coal shuttle cars. All three designs were determined to be feasible and desirable.
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1/1/1987 - Information CircularsInformation was collected at 5 bump-prone mines. Among the findings, two geologic conditions have been found to cause bumps in the eastern U.S.: relatively thick overburden and extremely rigid strata immediately above and below the mine coalbed.
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1/1/1977 - Information CircularsAn updated Bureau of Mines manual for the design of surface mine haulage roads. Covers such aspects as road alignment, construction materials, cross slope, drainage provisions and more.
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Content source: National Institute for Occupational Safety and Health, Mining Program