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- Products and materials:
- Bituminous coal
- Document types:
- Reports of Investigations
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Results 1 - 4 of 4
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10/1/1998 - Reports of InvestigationsLaboratory testing and results are presented where five bituminous coals were prepared and processed through a double roll crusher located in a low-velocity wind tunnel. The results indicate that a combination of several factors are associated with air...
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1/1/1977 - Reports of InvestigationsThe Bureau of Mines estimated the methane content of a coal, which depends primarily upon rank and pressure, from the adsorption equation V = kPn, where k and n are constants related to rank.
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1/1/1976 - Reports of InvestigationsIt is estimated that more than 1 trillion cubic feet of methane is contained within the coals of the Mary Lee Group in Jefferson, eastern Tuscaloosa, and southern Walker Counties, Alabama. It is calculated that approximately 90 pct of the methane is at ...
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1/1/1974 - Reports of InvestigationsThe natural vertical fracture system in bituminous coalbeds is called cleat. Cleat orientation commonly controls the direction of mining with major development paralleling the face cleat. Previous researchers have categorized the origin of cleat as endo...
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Content source: National Institute for Occupational Safety and Health, Mining Program