indonesia plans 50% mining export tax by 2013, page-4

I would avoid any further investment in Indonesia despite it bears some of the largest low rank coal deposits in the world.

The Indonesian government obviously pursues the philosophy that the country should benefit more from downstream processing of its natural resources (export ban for raw minerals and low rank coal), that resources should not be owned by foreign investors (ban of foreign investors holding more than 49% in deposits) and that profits should be heavily taxed (see recent tax plans mentioned above).
In addition there's the Benchmark Coal Price (HBA) which forces coal miners to sell coal at a very high level even if they are selling the coal to their very own subsidiaries in order to upgrade it. The current HBA pricing (http://mail.djmbp.esdm.go.id/files/HBA%20APRIL%202012.pdf) requires coal from Tabang to be sold for some $55/t rendering coal upgrading totally unprofitable (WEC once reckoned with a price of $10/t). In anticipation of this regulation WEC had an agreement with Bayan forcing them to abandon their share of profit in favour of WEC which they now challenge in court. In any case under the current regulation regime coal upgrading can never be profitable for both involved parties.

WEC will not be able to own the desired majority in any coal mine (which they say is a necessity to avoid a second Tabang-like disaster) and they'll probably be heavily taxed.

Even if they changed the HBA rules in favour of a upgrading industry keep in mind that nepotism rules Indonesia's politics and economy. WEC are competing with some very influential Indonesian companies such as Bumi, who have partnered up with Kobe Steel to develop another coal upgrading technology and who are controlled by the Bakrie family, one of the most politically connected families in the country. While Nirwan Bakrie runs the business side, his elder brother and Golkar party chairman Aburizal prepares for the 2014 presidential race.

The fact WEC couldn't even obtain an export license for Tabang during the last two years despite continous promises that this would happen imminently is just one very clear evidence of how somebody obviously has put obstacles in their way.

Unless WEC finds a really mighty partner I doubt they will ever get a BCB plant up and running in Indonesia and even if they succeed they will never be able to skim off those profits we once were hoping for.
Given all those regulative uncertainties I wouldn't invest a single penny in this jungle.