The Witwatersrand once produced 40% of the world's supply of this precious stuff
[DOC] [TLE] A guide to the biggest, most lucrative and most Buried Treasure ... [PAR] One of the few open-pit diamond mines in the world, it produces more stones ... 
that's radioactive enough that the EPA won't allow it to be sold and reused in 
such things as ... China's much-coveted rare-earths industry, which produces 
some 97% of the world's supply of ...