'Goaf' definitions:
Definition of 'Goaf'
From: GCIDE
- Goaf \Goaf\; n.; pl. Goafsor Goaves. [Cf. 1st Gob.] (Mining) That part of a mine from which the mineral has been partially or wholly removed; the waste left in old workings; -- called also gob . [1913 Webster]
- To work the goaf or To work the gob, to remove the pillars of mineral matter previously left to support the roof, and replace them with props. --Ure. [1913 Webster]
Definition of 'goaf'
From: GCIDE