Iminyango yomlilo wensimbi inezinhlobo eziningi ezahlukene zokuvula nezindlela zokusebenza, futhi inemisebenzi eminingi yobungcweti, engavalwa ngokuphumelelayo noma ihlukaniswe. Izinto ezisetshenziswa eminyango yomlilo wensimbi zonke ziyinsimbi eqinile futhi ezinzile, engenakho ukugqwala nokugqwala futhi inomsebenzi omuhle wokuvala.