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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Goaf n.; pl. Goafs or Goaves   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 .
 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.
 

From: Webster's Revised Unabridged Dictionary (1913)

 Goaves n. pl.  Mining Old workings. See Goaf.