We invited Rio Tinto to respond to allegations surrounding the environmental & social impacts of its operations but it declined.  The report includes allegations relating to the Grasberg mine (joint venture of Freeport McMoRan & Rio Tinto); you can see previous coverage of this and a response from Rio Tionto here.

The report also contains allegations relating to Barrick Gold's operations in Papua New Guinea.  You can see previous coverage of this and a response from Barrick Gold here.