- Highwall
- The unexcavated face of exposed over-burden and coal in a surface mine.U.S. Dept. of Energy, Energy Information Administration's Energy Glossary
Energy terms . 2014.
Highwall
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highwall — /huy wawl /, n. the unexcavated face of exposed overburden and coal in a surface mine. [HIGH + WALL] * * * … Universalium
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highwall — /huy wawl /, n. the unexcavated face of exposed overburden and coal in a surface mine. [HIGH + WALL] … Useful english dictionary
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