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Reserve and Resources

Reserve and Resources

As a mining-based company, exploration activities are important to maintain business continuity considering that a mine has a certain age (non-renewable). Despite having large and high quality reserves and resources, mainly for nickel and bauxite, in ANTAM in 2021 will continue exploration activities to ensure the Company’s sustainability through the Geomin Unit with focus on efforts to increase and obtain gold resources.

Reporting on the exploration and estimation results of ANTAM’s ore reserves and mineral resources refers to the reporting standards issued by the Joint Ore Reserves Committee (JORC) 2012 Code and is compiled following the rules of the Indonesian Mineral Reserves Committee (KCMI) 2017 Code. Exploration and calculation results of mineral resources & Ore reserves are carried out by the Geomin Unit, which is an exploration unit of ANTAM, which consists of a technical team with certification of Competent Person Indonesia (CPI) – PERHAPI (Association of Indonesian Mining Experts)/IAGI (Indonesian Association of Geologists) in the field of specialization in Exploration Data, Mineral Resources Estimation and Mineral Reserves Estimation and member of the Australian Institute of Mining and Metallurgy (MAusIMM).

ANTAM through the Geomin Unit undertakes integrated mineral exploration activities which include area survey activities, geological exploration, geophysical exploration, geodesy surveys, drilling, physical and chemical analysis, calculation of reserves and mineral resources supported by integrated Geographic Information System (GIS - Geographic Information System).


ANTAM's mineral reserves and resources in 2021 are as follows:

Proven and Probable Reserves

Commodity Unit

Reserve Ore Quantity

2020 2021
Nickel Ore million wmt 376 382
Bauxite Ore million wmt 106 107
Gold Ore ton 10.86 6.31

Mineral Ore Resources

Commodity Unit

Resources Ore Quantitiy

2020 2021
Nickel Ore million wmt 1,438 1,409
Bauxite Ore million wmt 586 587
Gold Ore ton 37.23 32.25

Based on the Competent Person’s report, figures as of December 31, 2021 estimations at this table including nickel figure from PT Gag Nikel, bauxite resources estimations at PT Borneo Edo International, PT Borneo Edo Sejahtera, PT Mega Citra Utama, PT Dwimitra Enggang Khatulistiwa and PT Gunung Kendaik, gold resources and reserves estimations at PT Cibaliung Sumberdaya.


For the latest information on ANTAM's exploration activities click Exploration Reports.


wmt : wet metric ton
dmt : dry metric ton

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