The largest development in theiron-oreindustry, usingmagneticconcentration, is at the plants of Witherbee, Sherman & Co. at Mineville, N. Y., where about 1,200,000 tons of crudeorewere mined and separated in 1916. The dry process ofseparationis used. The Chateangay;Ore&IronCo., at Lyon Mountain, N. Y., the Empire Steel &