Section 05 MINERAL PRODUCTS 26 ORES, SLAG AND ASH 26 15 NIOBIUM, TANTALUM, VANADIUM OR ZIRCONIUM ORES AND CONCENTRATES. 26 15 90 OTHER NIOBIUM, TANTALUM, VANADIUM ORES AND CONCENTRATES Commodity Code Description 26 15 90 00 OTHER NIOBIUM, TANTALUM, VANADIUM ORES AND CONCENTRATES