This has been quite a while coming but no surprise to the ones following it. The winds of trade and finance are shifting. Slowly but shifting.

http://www.zerohedge.com/news/2017-09-02/de-dollarization-accelerates-china-readies-yuan-priced-crude-oil-benchmark-backed-go

or here   http://oilprice.com/Latest-Energy-News/World-News/China-Readies-Yua...

John

Edit: last time a country tried to sell oil denominated in gold we invaded them and got rid of their leader. This time that might be tougher to do.