| Valuation - The act or process of valuing or of estimating the value or worth; appraisal. | |
| Vein - a well-defined tabular mineralized zone, which may or may not contain ore bodies. |  |
| 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 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. |
