Oman Exports of niobium, tantalum, vanadium or zirconium ores and concentrates to Yemen was US$1.27 Thousand during 2016, according to the United Nations COMTRADE database on international trade. Oman Exports of niobium, tantalum, vanadium or zirconium ores and concentrates to Yemen - data, historical chart and statistics - was last updated on May of 2024.