From what I read, the 49% clause only applies to
- Izin Usaha Pertambangan (IUP) mining business licences or
- Izin Usaha Pertambangan Khusus (IUPK) Special Mining Business Licences,
not to our existing COW:
http://www.highgrade.net/article/2012-03-14/Indonesian_rules_leave_expats_guessing