Poland Exports of niobium, tantalum, vanadium or zirconium ores and concentrates to Romania was US$2.91 Thousand during 2020, according to the United Nations COMTRADE database on international trade. Poland Exports of niobium, tantalum, vanadium or zirconium ores and concentrates to Romania - data, historical chart and statistics - was last updated on May of 2024.