Summary

Mine Type	Open Pit
Status	Active
Commodities	Coal (thermal)
Mining Method	Truck & Shovel / Loader
Production Start	...
Mine Life	...
Snapshot	Borneo Indobara coal mine (BIB) has been divided into five mining blocks: Kusan Girimulya (KG), Batulaki South (BS), Sebamban South (SS), Sebamban North (SN) and Pasopati (PP). Mining has been carried out in four blocks – Kusan (KG), Batulaki South (BS), Sebamban South (SS) and Sebamban North (SN). KG Block still remains as the main operating block to support BIB’s enhanced production along with some production from SN and BS Blocks. BIB is the first mining company to apply WIM for commercial weighing. WIM is a system used for measuring vehicle loads while in motion, and has been certified by the Legal Metrology Standardization Center (BSML) for commercial transactions.

Deposit type

• Sedimentary

Summary:

The Borneo Indobara (BIB) coal concession area has a general inverted U shape which follows both limbs of a synclinal structure with an approximate north-northeast trending synclinal axis. The seams generally display shallow dips of around 20 degrees but dips can increase locally up to around 60 degrees. The entire Pasopati resource area, which is adjacent to obducted basement volcanic and ophiolites, exhibits dips of around 60 degrees. The increased dip in the Pasopati resource area is associated with increased coal rank, as seen from the fact that coals in the Pasopati area have in general higher calorific values compared to coals in the rest of the concession.

Structure within the area is relatively benign, with most of the significant faults in the area consisting of the north-east trending thrust faults that follow the general trend of the fold axes. Normal and block faulting is seen mainly in the basement (Pre-Tertiary) rocks (Panggabean, 1991). However, localised increase in seam dips have been observed in the coal models constructed for resource estimation purposes and this may be due to as yet un-mapped faults.

Kusan Girimulya (KG Block)
The deposit at KG Block contains approximately 54 modelled coal seams of which 20 have been split into upper and lower plies. Some seams are less continuous than others and have been modelled to pinch out were not present in a particular drill hole. In particular the D1 seam has a limited extent through the deposit due to the fact that has not been correlated in the majority of holes drilled. In contrast, the BL2U seam is one of the most continuous seams and is present throughout the deposit. This resource area covers the eastern outcrop of the Warukin formation coals and seams dip shallowly to the west. The coal quality is low rank with high inherent moisture and low ash and sulphur contents. This area is currently being mined.

Batulaki South (BS Block)
This resource area is situated on the western flank of the syncline and seams consequently dip to the east. Seams in this area also form part of the Warukin Formation with coal quality characteristics that are very similar to KG, SS Block and SN Block areas. There are 40 named and correlated seams in this area. No correlation between the Warukin coals across the western and eastern limbs of the syncline has been undertaken.

Sebamban South (SS Block)
Warukin Formation coal seams occur in this resource area, dipping shallowly to the west. There are 20 named and correlated seams including splits that have been identified in this area. The coal quality is similar to the KG, BS Block and SN Block areas but no correlation of seams between these areas has been made to date.

Sebamban North (SN Block)
This resource area is found immediately north of the SS Block and has many characteristics in common with SS Block coals. Warukin Formation coal seams dip shallowly to the west and 22 seams have been named and correlated across the area. The coal quality is similar to the KG, BS Block and SS Block areas.

Pasopati (PP Block)
The coal seams in this resource area belong to the Tanjung Formation and are therefore older than the Warukin Formation coals found in the rest of the concession. The coal is steeply dipping (60 degrees) to the east and exhibits higher rank and resultant higher energy. There are 13 named and correlated seams in this area. The area has not been officially mined to date but has been extensively worked by artisanal miners in the past due to the prized high quality of the coal in this area. This area has not been mined yet, however it is planned to be mined from 2023 onwards.

Within the BIB concession, Warukin Formation coals are classified as a low energy sub-bituminous class B coal. The Tanjung Formation coals in the PP Block are classified as Bituminous class A coal.

Mining Methods

- subscription is required.

Comminution

Crushers and Mills

Processing

- subscription is required.

Commodity Production

Commodity	Units	2024	2023	2022	2021	2020	2019	2018	2017	2016
Coal (thermal)	Mt	....	....	....	....	....	29	20	13	7.5
Sulfur	%			0.22

Operational metrics

Metrics	2024	2023	2022	2021	2020	2019	2018	2017	2016
Coal tonnes mined	....	....	....	....	....	28.7 Mt	20.3 Mt	13.3 Mt	7.46 Mt
Waste	....	....	....	....	....	123,526,934 bcm	98,727,410 bcm

Personnel

Job Title	Name	Profile	Ref. Date
.......................	.......................		Dec 31, 2022
.......................	.......................		Jul 24, 2025
.......................	.......................		Jul 24, 2025
.......................	.......................		Jul 24, 2025
.......................	.......................		Jul 24, 2025
.......................	.......................		Dec 31, 2022
.......................	.......................		Jul 24, 2025

Employees	Contractors	Total Workforce	Year
......	......	......	2024
......	......	......	2023
......	......	......	2022
......	......	......	2021
......			2020
......			2019
......			2018