noun
drift; driftway
Mining term for a horizontal or gently inclined passage driven along a coal seam or ore body. Rare; cross-referenced with 沿層坑道.
See also: 沿層坑道
ひ押し坑道は石炭層に沿って掘られる。
A drift is excavated along the coal seam.
Synonymous mining term; 沿層坑道 explicitly means 'entry driven along the seam', while ひ押し坑道 is a rarer synonym.
Compound of ひ (a mining term for a coal face or working place) + 押し (pushing, driving) + 坑道 (tunnel, gallery). The exact derivation of ひ is uncertain; it may be a specialized mining term.