Valuation - The act or process of valuing or of estimating the value or worth; appraisal.
Velocity - Rate of airflow in lineal feet per minute.
Ventilation - The provision of a directed flow of fresh and return air along all underground roadways, traveling roads, workings, and service parts.
Violation - The breaking of any state or federal mining law.
Virgin - Unworked; untouched; often said of areas where there has been no coal mining.
Void - A general term for pore space or other reopenings in rock. In addition to pore space, the term includes vesicles, solution cavities, or any openings either primary or secondary.
Volatile matter - The gaseous part, mostly hydrocarbons, of coal.
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