Freeport-McMoRan signalled it’s made progress with Indonesia on how to value its flagship Grasberg mine, but warned that the final stages of divestment negotiations are complex.“We are working with the government to have a complete resolution of those issues, and the current goal that we’re both working on is by the end of the year,” Chief Executive Officer Richard Adkerson said from Jakarta during a two-hour long earnings call that was, once again, dominated by questions about Indonesia.