He Future Of Tantalum And Niobium Mining Technolo
Jan 13 2010tantalite contains some niobium with the mineral being referred to as niobite or columbite when the niobium content is greater than that of tantalum indeed until the discovery of the worlds pyrochlore deposits in the 1950s niobium was a byproduct of tantalum mining with increasing demand ensuring that it was highly valued and highly