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Results 81 - 90 of 270
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7/1/1995 - Reports of InvestigationsResearchers at the U.S. Bureau of Mines collected and analyzed overcore measurements and other indicators of in situ stress characteristics at the Lucky Friday Mine, Mullan, ID. An analysis of these data revealed that significant local variations in in ...
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7/1/1995 - Reports of InvestigationsThe U.S. Bureau of Mines conducted an overcore stress measurement on the 5300 level of the Lucky Friday Mine, Mullan, ID, to investigate the stress regime around an experimental stope in a rock-burst-prone mine. The result indicated a stress field with ...
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5/1/1995 - Reports of InvestigationsA U.S. Bureau of Mines case study of pillar recovery in high-grade ore near the Ross shaft at the Homestake Mine, Lead, SD, has demonstrated the usefulness of the finite-element method for evaluating shaft pillar mining plans and shaft stability. This r...
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1/1/1995 - Reports of InvestigationsThe U.S. Bureau of Mines has constructed a smoke chamber and developed sensitivity tests for smoke detectors. Evaluation of six smoke detectors showed their potential for use as mine fire sensors or as part of a mine atmospheric monitoring system.
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1/1/1995 - Reports of InvestigationsA report on research to determine the alarm times of smoke and carbon monoxide sensors and a point type heat sensor to slowly developing coal-conveyor belt fires.
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1/1/1995 - Reports of InvestigationsThis report presents the results of tests conducted by the U.S. Bureau of Mines to determine the transport characteristics of highly concentrated paste backfill mixes made from dewatered total mine tailings. The results indicated that the tested backfil...
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1/1/1995 - Reports of InvestigationsA hydrologic-subsidence investigation was performed to evaluate the effects of longwall mining on the local groundwater regime through field monitoring and numerical modeling.
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1/1/1995 - Reports of InvestigationsDisplacement and stress changes in cemented backfill and ore pillars at the Buick Mine, near Boss, MO, were monitored by engineers from the U.S. Bureau of Mines and The Doe Run Co., St Louis, MO. Objectives of this research were to evaluate the effect ...
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1/1/1995 - Reports of InvestigationsThis U.S. Bureau of Mines study examined spontaneous heating episodes in coal mine pillars in an active underground coal mine. The objective of this study was to discover if the location of future events of pillar spontaneous heating could be inferred ...
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1/1/1995 - Reports of InvestigationsReports on a USBM study of three gel sealant systems used to minimize air ingress to areas in the mine that can undergo self-heatings and specifically mines that sustain both floor heave and self-heatings.
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Content source: National Institute for Occupational Safety and Health, Mining Program