SDJ has been engaged in coal mining activities in South Kalimantan since 2002. SDJ concession covers an area of 235.5 ha and is administratively located in Angsana and Sungai Lohan Districts, Tanah Bumbu regency, South Kalimantan. Tenure for SDJ is held under an operation production mining business license (Izin Usaha Pertambangan – IUP Operasi Produksi) and the validity of the extended SDJ IUP is effective through to May 2027. SDJ holds two valid IPPKH, which was extended to 2027 in line with the extended IUP, for a total area of ± 84.6 ha.
Mining contractor for SDJ is PT Bukit Makmur Mandiri Utama (BUMA), one of the largest mining services companies in Indonesia. BUMA is listed on the Jakarta Stock Exchange under PT Delta Dunia Makmur Tbk.

Coal within the SDJ concession is characterised as high moisture, low ash, low sulphur and low energy.

 Category   Mineral Type  Gross Attributable to License 1    Net Attributable to Issuer 4  Remarks
Grade Tonnes
Grade Change from
previous update
Reserves 5              
Proved  Coal 11.3 Sub-bituminous
Rank C
11.2 Sub-bituminous
Class C
- 11% Change due to production
Probable Coal 6.66 Sub-bituminous
Rank C
6.59 Sub-bituminous
Class C
- 2% Change due to production
Total Coal 17.9 Sub-bituminous
Rank C
17.8 Sub-bituminous
Class C
- 8% Change due to production
Resources 3 & 5
Measured Coal 13.5 Sub-bituminous
Rank C
13.4 Sub-bituminous
Class C
- 10% Change due to production
Indicated Coal 8.2 Sub-bituminous
Rank C
8.1 Sub-bituminous
Class C
0% Change due to production
Inferred Coal 4.2 Sub-bituminous
Rank C
4.2 Sub-bituminous
Class C
0% No Change
Total Coal 25.9 Sub-bituminous
Rank C
25.6 Sub-bituminous
Class C
- 5% Change due to production

1 License refers to SDJ Production Operation IUP.
2 Previous Coal Reserves and Coal Resources estimates were reported as at 31 August 2021.
3 Resources are inclusive of Reserves.
4 The results presented are rounded to reflect the accuracy of the estimates. Minor discrepancies are due to rounding and are not considered material by SMGC.
5 Resources and Reserves are reported in accordance with SMGC’s interpretation of the JORC Code 2012 Edition.