Star Mountain Plaza Limited is a joint venture between the Independent State of Papua New Guinea and three MRDC subsidiaries that hold landowner and provincial government interests;
- Mineral Resources Star Mountain (MRSM) – Mt Fubilan landowners
- Mineral Resources Ok Tedi No. 2 (MROT) – Fly River Provincial Government
- Petroleum Resources Kutubu Limited (PRK) – SHPG, GPG, Kutubu and Kikori landowners.