Subagyo Hadi Siswoyo

PT Wiraswasta Gemilang Indonesia re-refines used oil in order to derive base oil. Its services include rerefinery plant, blending plant, ultra lab services and used oil collection. The company was founded on March 4, 1996 and is headquartered in Jakarta, Indonesia.

Part of PT Berau Coal Energy, PT Berau Coal is a company that provides mining and extraction of coal. The company is based in Berau, Indonesia. The CEO of the Indonesian company is Fuganto Widjaja.

PT Berau Coal Energy Tbk operates as a holding company, which engages in the coal mining business. Its mining activities include exploration, development, transportation, marketing, and trading of coal. The firm produces and sells thermal coal products under the brand names of Mahoni, Mahoni-B, Agathis, Sungkai, and Ebony. The company was founded on September 7, 2005 and is headquartered in Berau, Indonesia.