2. Pongkor Gold Mine in Bogor
Pongkor is the largest epithermal gold mine in Indonesia, located in Bogor, West Java. As explained in the 2013 UGM Repository.
Citing ANTAM's website, ANTAM's primary gold and silver production comes from the Pongkor underground mine in West Java and Cibaliung, Banten.
Indications of gold deposits in Pongkor were discovered by the Geomin Unit in 1981, and production began in 1994 after obtaining a permit in 1992.
The Pongkor gold mine has three main gold veins: Ciguha, Kubang Cicau, and Ciurug.
The mining method uses conventional cut and fill stoping at the Ciguha and Kubang Cicau gold veins.
In 2021, ANTAM's total consolidated gold ore reserves were recorded at 1.02 million dry metric tons (dmt), equivalent to 203,000 troy oz (6.31 tons) of gold metal.
Meanwhile, ANTAM's consolidated gold mineral resources in 2021 were recorded at 6.75 million dmt, equivalent to 1,037,000 troy oz (32.25 tons) of gold metal.
After the gold ore is mined, it is processed through several processes, including crushing, milling, cyanidation, carbon leaching and stripping, electro-winning, and casting, to produce bullion/dores.
The dores/bullions produced from the mine are then sent to be refined into gold at the Precious Metals Mining Plant (UBPP Logam Mulia) in Jakarta.
3. Martabe Gold Mine in North Sumatra
The Martabe Gold Mine in North Sumatra Province is the primary operational site of PT Agincourt Resources (PTAR).
According to the company's official website, the Martabe gold mine is under a 30-year, sixth-generation contract of work with the Indonesian government.
Its area covers 130,252 hectares (1,303 square kilometers), encompassing the regencies of South Tapanuli, Central Tapanuli, North Tapanuli, and Mandailing Natal.
The operational area of the Martabe Gold Mine in South Tapanuli Regency covers 509 hectares as of January 2022.
The Martabe Gold Mine began full production on July 24, 2012, and has a resource base of 6.5 million ounces of gold and 64 million ounces of silver as of June 30, 2022.