● Sulawesi Tenggara: PT Antam UBPN, PT Macika Mada Madana (MMM), PT Gema Kreasi Perdana (GKP)
● Maluku Utara: PT Trimegah Bangun Persada (TBP), PT Gane Permai Sentosa (GPS), PT Megah Surya Pertiwi (MSP)
● Sulawesi Tengah: PT Indonesia Morowali Industrial Park (IMIP), PT Sulawesi Mining Investment
● Sulawesi Selatan : PT Vale Indonesia, PT Ceria Nugraha Indotama (Cerindo).(***)
Penulis: Teknik Metalurgi ITB
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