Sumatra gold, silver project to clear hurdle AUSTRALIAN-LISTED junior Sumatra Copper and Gold, which is backed by the same parties that took control of Intrepid Mines' Indonesian project, is expected to announce today it has received approval to push ahead with development of its gold and silver project. In stark contrast to the drama unfolding at Intrepid, Sumatra has strong local partners, which has helped it expedite the approvals process.