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

Kingman (vicinity), Arizona. A view of the plant where the tungsten ore, mined at the Boriana mine, is processed. Sagebrush and cacti cover the desert mountains surrounding the plant