Onye na-ekewapụ onwe ya n'ihi na enweghi mkpokọta nke na-erughị 3mm magnetite, pyrrhotite, ilmenite na ihe ndị ọzọ, mgbochi mmiri magnet, ma maka coal, mineral metallic, ihe owuwu ụlọ na ihe ndị ọzọ na mgbakwunye na ọrụ ígwè.
