Though much of this article is about the relationship Rio and BHP have with China in regards to steel... there is an interesting mention of Rio's desire to seek partnerships with China in mining in other parts of the world. South America is one of those locations.
Isn't China a financial partner with the Venz's?
Just an interesting FWIW.
www.mineweb.com/mineweb/view/mineweb/en/page67?oid=49739&sn=Detail
If the link doesn't work... it is in this morning's Mineweb headlines/stories.
Have a great day.