1. Coal Mining Concession

STM has its own 3 mining concessions. The first one is PT. Cahaya Energi Mandiri (CEM) in which has produced for over 4 years and the other 2 concessions are PT. Korina Jaya located in Kota Bangun (7,000 AR, 5000 ha) and PT. Alumuga located in Tabang (3,700~3,900 AR, 894 ha)

2. Coal Mining Contractor

One of STM’s subsidiary companies PT. CMS Kaltim Utama (CMS) is the coal mining contractor who can produce coal by operating and engineering skills for other mine owners. PT. CMS Kaltim Utama has a lot of experiences mainly in East Kalimantan and Currently PT. CMS is fulfilling coal production as a contractor in PT. CEM concession.

3. Equipment Rental

PT CMS Kaltim Utama also performs equipment rental business for other mining contractors or mining owners. Main rental equipments are Excavators, Dozers, Motor graders and Compactors.

4. Coal Trading

One of STM’s subsidiaries PT. STM Coal Trading is doing coal trading business. Over the years STM Coal Trading has supplied coal for the international as well as domestic market.

5. Aggregate Business at Central Sulawesi

STM’s jointed partner company PT. Batu Indah Mulia is doing preparation for aggregate production and trading. The aggregate mine is located in Palu, Central Sulawesi and the aggregate can be supplied to Kalimantan and Java area.

6. Special Economic Zone at Palu City

STM is participating in Development for Palu Special Economic Zone as an authorized agent for attracting investment from domestic & overseas investors. The president director of STM is an officially assigned representative for attraction of investment for Palu city Special Economic Zone.