Ezimayini ze-placer, igolide litholwa ngokuhlukaniswa kwamandla adonsela phansi, ngenxa yokumba amatshe aqinile, ezinye izindlela zivame ukusetshenziswa. Amaphampu enjoloba ancibilikayo avame ukusetshenziswa ekucubunguleni izimayini zegolide, ngokufaka i-volute liner yerabha kanye nesixhumi senjoloba.
Isikhathi sokuthumela: Jul-13-2021