01 n. That part of a mine from which the mineral has been partially or wholly removed; the waste left in old workings; -- called also gob .
pl.
Goafs, Goaves ((#))
-
1.
That part of a mine from which the mineral has been partially or wholly removed; the waste left in old workings; -- called also gob .(Mining) Also: gob
Phrases & compounds
To work the goaf —
to remove the pillars of mineral matter previously left to support the roof, and replace them with props.