I have just been doing some research on mining licenses in Indonesia and I believe it is an IUPK production permit (DSO sales) we are currently awaiting on from the governing bodies. There is an interesting read on this in a book called "mining law and regulatory practise in Indonesia". If you type in in google you can get some great information on whats involved.
Also from my research on this topic it would seem that GMC are in an extremely advantageous position with the new mining laws which past in January 2017. (Another great read found on a google search).
Feeling very confident in what is about to transpire from here.