MINERALS ANUGERAH SEMESTA, PT Riau Archipelago Coal, Exwinlerd Ong, Mas Marrijanto Soedarsono, Eddy Hussy mas@btm.com (62-778) 452288, 459632 (Hunting) (62-778) 459633 Jl. Lasmana Bintan, Komplek Executive Blok I No. 1-2 Sei Panas