Rio Tinto said Feb. 15 that it appointed Moya Greene as an independent nonexecutive director.

Greene is the CEO of Royal Mail Group and will join the mining giant's board in the second half.

Paul Tellier intends to step down from the board at the conclusion of the company's annual general meeting May 2.

S&P Global Ratings recently lifted Rio Tinto's long-term issuer credit rating to A from A-, reflecting the company's strengthened balance sheet and debt reduction efforts as well as its ability to preserve its leading cash cost position in its iron ore business.

S&P Global Ratings and S&P Global Market Intelligence are owned by S&P Global Inc.