Kingman (vicinity), Arizona. A miner going toward a train of mine cars at the entrance of the Boriana mining company. These cars carry tungsten ore to a concentrating plant in the same area. The mine is about forty miles from Kingman

Kingman (vicinity), Arizona. Powdered tungsten ore, mined near Kingman at the Boriana workings. This ore is used to increase the hardness of steel for cutting tools and, since the war, has been used for many vital war purposes