Goaf

• (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 .
Found on http://thinkexist.com/dictionary/meaning/goaf/

Goaf

Goaf ; noun ; plural Goafs or Goaves . [ Confer lst 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 . To work the goaf or gob , to remove...
Found on http://www.encyclo.co.uk/webster/G/40
No exact match found