Iron, pig iron and crude steel refers to various mineral aggregates from which the metal is obtained by the conversion of various iron ores by reduction either into pig iron, in blast furnaces or electric furnaces, or into a spongy form (sponge iron) or into lumps by various direct reduction processes. Iron ore is measured by the weight of the ore and may contain varying concentrations of metal. Comprises: - iron ores and concentrates, other than roasted iron pyrites (Central Product Classification (CPC) Group 141) ; and - basic iron and steel (CPC Group 411)