Dab tsi yog cov teeb meem nrogniobium?
Ib puag ncig, cov teeb meem tseem ceeb ntsig txog niobium thiab tantalum mining yog av cuam tshuam, ntim ntawm cov ntaub ntawv pov tseg thiab lawv pov tseg, thiab cov xov tooj cua ntawm qee qhov tailings thiab cov khoom pov tseg uas muaj thorium thiab uranium.
