A horizontal tunnel opening from the surface used for haulage, access to a mine, exploration or drainage.
Related Terms
| Term |
Note |
| MINE |
An excavation made in the earth for the purpose of digging out metallic ores, coal, salt, precious stones and other minerals. Use specific term where known. |
| SHAFT |
A vertical passage which provides access or ventilation to an underground excavation or chamber. Use only if function is unknown, otherwise use specific term. |
| TUNNEL |
An artificial underground channel. Use specific type where known. |
