Indonesia’s Attorney General’s Office has detained coal businessman Samin Tan after naming him a suspect in a corruption investigation linked to coal mining operations in Murung Raya, Central Kalimantan, marking one of the highest-profile enforcement moves this year in the country’s extractive sector. Prosecutors said late on Friday, 27 March, that Tan, identified as the beneficial owner of PT Asmin Koalindo Tuhup, or PT AKT, would be held for 20 days at the Salemba detention facility while investigators continue the case. The case centres on alleged irregularities in the management of PT AKT’s mining activities between 2016 and 2025. According to prosecutors, the company’s coal contract status had already been terminated by an Energy and Mineral Resources Ministry decree dated 19 October 2017, yet mining and coal sales allegedly continued afterwards using permits and documents that investigators say were invalid. The Attorney General’s Office said prosecutors suspect unlawful cooperation with state officials responsible for overseeing mining activity, though it has not yet publicly detailed how many officials may be implicated.
That chronology is critical to the legal case. Prosecutors argue that once the PKP2B coal mining agreement tied to PT AKT had been terminated, the company no longer had the right to mine coal within the concession area. They allege that operations continued anyway, turning what might otherwise have been a regulatory dispute into a corruption and state-losses investigation. The amount of financial damage to the state is still being calculated by the Financial and Development Supervisory Agency, known as BPKP, according to the Attorney General’s Office.
The detention comes after months of wider state scrutiny of PT AKT’s land use and operations in Murung Raya. In January, the Forest Area Control Task Force, or Satgas PKH, said it had taken back control of 1,699 hectares of mining land used by PT AKT in Central Kalimantan. Officials said at the time that the company faced potential administrative fines of more than Rp4.24 trillion, based on calculations under an Energy Ministry decision issued in 2025. That earlier action signalled that the state was moving beyond administrative review and towards broader legal exposure for the company and its controllers.
For Indonesia’s mining sector, the move is significant well beyond one businessman. Coal remains a pillar of export earnings and domestic industry, but the sector has long drawn scrutiny over permitting, land use, forest encroachment and political links. By framing the PT AKT matter as a corruption case tied to post-termination mining activity, prosecutors appear to be testing a stronger enforcement model: one that treats unauthorised extraction not only as a licensing breach but also as a criminal matter with possible corruption dimensions where officials are suspected of enabling it.
Tan is one of the best-known names in the country’s coal business. He built PT Borneo Lumbung Energi & Metal and became widely recognised internationally through his involvement in the London-listed Bumi Plc saga more than a decade ago, when he backed major transactions involving the Bakrie family and emerged as a central figure in one of the industry’s most closely watched corporate battles. Reuters reporting from that period described him as the businessman behind Borneo Lumbung’s billion-dollar entry into Bumi and later the deal that increased his influence in the group.
The detention also revives attention on Tan’s earlier legal troubles. Bloomberg noted that he had previously been named a suspect in a 2019 anti-graft case related to bribery allegations involving a lawmaker during a shareholder dispute. Later reporting from other outlets said he was acquitted in that matter, with the court restoring his rights after the ruling. That history does not determine the outcome of the Central Kalimantan case, but it does ensure that the new investigation will be watched closely by investors, legal observers and political elites alike.
What happens next will hinge on whether prosecutors can substantiate two elements: first, that PT AKT knowingly continued mining after its legal basis had lapsed, and second, that this was done with the help or protection of public officials whose conduct crossed into corruption. The Attorney General’s Office said searches had been carried out in Jakarta, West Java, South Kalimantan and Central Kalimantan, suggesting the probe is broad in both geography and documentary scope. Tan has been accused under provisions that prosecutors said combine articles of the new Criminal Code with the anti-corruption law, a sign that authorities are trying to construct a more expansive case than a standard licensing violation.
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Oman