Many moons ago when I was just a lad, I had shares in Goldrim who had a large tantalum deposit at "wadjina" ( might not have spelling correct) in W.A. Sons of Gwalia took them over and they were then the largest Tantalum producer in the world. In the wash up of of Sons of Gwalia, someone would now own it, but I'm not sure where it finished up.
There is probably enough info here to track it down though.
