PT Indogold Mineral Makmur is an Indonesian mining company developing gold and rare-earth-element assets within the Graha Makmur Coalindo group. Headquartered in Jakarta, the company combines fully owned operations, on-site processing, and a long-horizon resource pipeline serving electronics, energy, and industrial supply chains.
Operations span exploration, extraction, on-site processing, and refining — supported by Indonesian regulatory permits, group-level infrastructure, and a research relationship with Indonesia's national geological agencies.
The concession sits offshore of Bayah on the Banten coast of Java, worked from company-operated bulk carriers and crew-transfer vessels. Sea-mined material is loaded at sea and discharged at port for processing through the group's onshore circuit.
OMS Bromo — bulk carrier on the Banten coast, supporting offshore operations.
Doré bullion — produced from on-site refining of recovered gold.
The company's mining and processing circuit produces refined gold doré, supported by silver, copper, and a rare-earth-element pipeline. All output is processed through an integrated circuit operated within the group, with assay verification at every stage.
Marine operations conducted by deployed dive teams in the company's offshore concession area, supported by working vessels and surface logistics.
Surface entry — marine teams deploy from working vessels.
Offshore operation — divers descending the anchor line.
Marine concession — working the Indonesian seabed.
Dr. Henry Salim leads PT Indogold Mineral Makmur as President Director, with operational responsibility for the company's mining, processing, and corporate functions. He holds a Ph.D. in Administration and brings a long career in Indonesian resource development to the role, including the build-out of the company's integrated production and refining capability.
Suhartono Sardjono serves as Commissioner of PT Indogold Mineral Makmur, providing supervisory oversight of the company's strategic direction and governance.
