mine opening
generic term for various typs of cavities in mining
adit
horizontal entrance shaft to an underground mine
roadway
tunnel in mine workings with regular, fairly uniform cross-section
lateral drift
vein which is pushed sidewards from a stream-work
sough
an underground channel for draining water out of a mine
tunnel
underground passageway
prosek
type of horizontal mine roadway
ort
horizontal underground mine
mine shaft
underground vertical or inclined passageway in mining engineering
borehole
narrow shaft bored in the ground