Tungsten ores are sold and priced in "tonne units" or 100'ths of a tonne. Tungsten concentrates must exceed 65% WO3 and current uses prefer scheelite (for the APT - Ammonium paratungstate process to tungsten metal) to the wolframite series (huebnerite-ferberite) normally used as a direct steel making additive.
Current market for a tonne unit of tungsten concentrate is around US$300 - somewhat higher than when Carrock worked in the 1970's when a tonne unit was around US$25 !! Carrock still contains a significant inferred resource below the No. 2 Level although no drilling has been completed to confirm this potential.
This issue that closed Carrock under Minworth was the lack of area for a tailings management facility and that problem would still remain, but suprising nobody has thought of exploratory drilling yet!?!