That part of a mine from which the mineral has been partially or wholly removed; the waste left in old workings; -- called also gob .
That part of a mine from which the mineral has been partially or wholly removed; the waste left in old workings; -- called also 
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 .
Goaf
That part of a mine from which the mineral has been partially or wholly removed; the waste left in old workings; -- called also 
Usage Examples
Goaf, Goaf, oaf, Goaf, Gioaf, G9oaf, G0oaf, Gpoaf, Gloaf, Giaf, G9af, G0af, Gpaf, Glaf, Goiaf, Go9af, Go0af, Gopaf, Golaf, Goqaf, Gowaf, Gosaf, Gozaf, Goqf, Gowf, Gosf, Gozf, Goaqf, Goawf, Goasf, Goazf, Goadf, Goarf, Goatf, Goagf, Goavf, Goacf, Goad, Goar, Goat, Goag, Goav, Goac, Goafd, Goafr, Goaft, Goafg, Goafv, Goafc.