Underground metal (3)
I believe the answer is:
ore
(Other definitions for ore that I've seen before include "Metal-bearing rock or mineral" , "Foreign currency" , "Valuable resource" , "Mineral-bearing material" , "Mined material" .)
I believe the answer is:
ore
(Other definitions for ore that I've seen before include "Metal-bearing rock or mineral" , "Foreign currency" , "Valuable resource" , "Mineral-bearing material" , "Mined material" .)