Summary

Mine Type	Open Pit
Status	Active
Commodities	Coal (thermal)
Mining Method	Truck & Shovel / Loader
Production Start	...
Snapshot	From the Sambarata mine the coal is blended to produce the brand of Ebony.

Deposit type

• Sedimentary

Summary:

Pre-Tertiary, Eocene and Oligocene sedimentary rocks are present in the Tanjung Redeb area but none are found in the Berau Coalfield (Lati, Kelai and Binungan areas). The Eocene and Oligocene sediments are dominantly marine, fine grained clastic rocks with rare volcanic units, although non-marine sandstones and minor coal deposits occur immediately above the basal Tertiary unconformity.

The oldest rocks present in the Berau Coalfield are of Miocene age and belong to the Sterile Formation. This formation is composed of marine mudstone, siltstone and sandstone. The sandstone is massive and fine- to very fine-grained and it is interbedded with mudstone and siltstone. Burrows are common in all lithologies.

The Sterile Formation conformably underlies the coal-bearing Berau Formation although the contact between the formations is difficult to place in the Berau Coalfield. The Berau Formation, at least 400 metres thick, contains interbedded mudstone, siltstone, sandstone and coal. Shell fossils, plant impressions, coal flakes and burrows are common, particularly in the mudstone.

The coal measures of the Tarakan Basin occur in the Berau Formation which contains at least 19 seams. The thicknesses of the seams range from a few centimetres up to 4.5 m with dips of 5° to 20°. Exposure of the seams is good and they can be traced in three geographic areas which correspond to structural zones formed by post Miocene folding - Kelai, Lati and Binungan.

Mining Methods

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Comminution

Crushers and Mills

Processing

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Commodity Production

Commodity	Units	2023	2022	2021	2020	2019	2018	2017	2016	2015
Coal (thermal)	Mt	....	....	....	....	4.4	3.7	2.5	2.7	4.7
Sulfur	%			0.8	0.8	0.8	0.8	0.8	0.8

Operational metrics

Metrics	2023	2022	2021	2020	2019	2018	2017	2016	2015
Coal tonnes mined	....	....	....	....	4.4 Mt	3.7 Mt	2.5 Mt	2.7 Mt	4.7 Mt

Personnel

Job Title	Name	Profile	Ref. Date
.......................	.......................		Aug 20, 2024
.......................	.......................		Aug 20, 2024