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- Mining types and methods:
- Longwall mining
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Results 81 - 90 of 99
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3/1/1995 - Technology NewsThe absence of fundamental scientific and engineering principles in the design and placement of gob gas ventholes can cause difficulties for mine operators when gas emissions increase because of a change in mine design or because variable geologic condi...
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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 InvestigationsSubsidence data gathered by the U.S. Bureau of Mines over a series of longwall panels in the Pittsburgh Coalbed were studied to obtain insight as to the role of time in the subsidence process. These results were then compared to data from three other si...
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3/1/1994 - Technology NewsThe USBM's current approach to air splitting consists of using a polyester mesh partition to overcome the visibility problems of a solid barrier.
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1/1/1993 - Reports of InvestigationsThis report investigates the removal of gate road chain pillars in conjunction with longwall retreat mining. The objective was to determine how the pillars, supplemental support, and entries were affected by the longwall abutment pressure.
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1/1/1993 - Reports of InvestigationsThis report presents results of a U.S. Bureau of Mines study of longwall gob material. The objective of this work was to determine material stiffness properties of the gob for use in numerical models or rock mass response to longwall mining.
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1/1/1992 - Information CircularsA U.S. Bureau of Mines investigation of longwall panel layouts to maximize coal recovery and minimize interactive problems in multiple-seam operations.
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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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1/1/1992 - Reports of InvestigationsThe U.S. Bureau of Mines investigated the relationship of bituminous coal seam parameters and the amount of respirable dust generated at longwalls.
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1/1/1992 - Information CircularsThis report examines shield design, operation practices, and the consequences for using high-capacity shield support systems. An optimization goal is to minimize support loading by using an active shield setting force compatible with strata behavior.
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Content source: National Institute for Occupational Safety and Health, Mining Program