Eurostat, Luxembourg. 2615 (01/1988-..) Niobium, tantalum, vanadium or zirconium ores and concentrates: CN 2615 /Exports /Unit = Prices (Euro/ton) /Partner: Nigeria /Reporter: European Union /2615:Niobium, Tantalum, Vanadium or Zirconium Ores and Concentrates.