GOAF
Etymology
Noun
goaf (plural goafs or goaves)
A rick or stack (of hay, etc.) when laid up inside a barn.
(mining) That part of a mine from which the mineral has been partially or wholly removed.
(mining) The waste left in old workings.
Synonyms
• (waste): gob, gobbin
Source: Wiktionary
Goaf; n.; pl. Goafs or Goaves. Etym: [Cf. lst Gob.] (Mining)
Definition: That part of a mine from which the mineral has been partially
or wholly removed; the waste left in old workings; -- called also gob
. To work the goaf or gob, to remove the pillars of mineral matter
previously left to support the roof, and replace them with props.
Ure.
Source: Webster’s Unabridged Dictionary 1913 Edition