Значения термина ores of iron на английском

Another principal division of Mr. Lesley's book treats of the ores of iron in the United States.

They will also be more anxious to extract the carbon from the cornstalks for reducing ores of iron and of other metals.

They were specially interesting, for they carried some less common minerals such as beryl, tourmaline, garnet, coarse mica and ores of iron, copper and molybdenum.