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- Geologic conditions and events:
- Clay veins
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1/1/1987 - Reports of InvestigationsThe Bureau of Mines investigated the physical characteristics of and roof instability problems associated with clay veins. This was accomplished by observing and mapping clay veins in surface and underground mines. The occurrence and origins of clay vei...
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3/1/1969 - Technical Progress ReportsThe Bureau of Mines conducted drilling studies in the Pocahontas No. 3, the Pittsburgh, and a western coalbed to establish the gas migration characteristics for each.
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Content source: National Institute for Occupational Safety and Health, Mining Program