Amman Mineral Nusa Tenggara, the gold mining subsidiary of Medco Energi Indonesia (MEDC), said its US$1 billion smelter development in West Sumbawa, West Nusa Tenggara, is progressing according to plan. Progress in Amman’s smelter development is crucial for the company to secure an extension of its ore export permits, which will expire in February. The company currently has permits to export 675,000 metric tons of gold and copper concentrate.