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- Geologic conditions and events:
- Gas emissions
- Document types:
- Technical Progress Reports
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8/1/1970 - Technical Progress ReportsMethane emission rates were studied in a Pittsburgh coalbed mine in northern West Virginia. Air volumes and methane percentages were recorded, and time studies of the miner were made during five consecutive operating days, during which a complete cycle...
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5/1/1969 - Technical Progress ReportsGas occurs in coalbeds in an adsorbed and a free gas state. Adsorbed gas is stored in the micropore structure and its transport is governed by Fick's law. The free gas occurs in the fracture system and flows according to Darcy's law. These two modes of ...
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Content source: National Institute for Occupational Safety and Health, Mining Program