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