Mining giants - the top ten richest mining companies
Mar 26, 2014· Mining giant Glencore Xtrata is developing the Zanaga iron ore project in the Republic of Congo. BHP Billiton, which operates the world biggest copper mine Escondida, is the world's second biggest mining company by revenue. Simandou iron ore project in Guinea is being developed by Rio Tinto, the third biggest mining company in the world.