The Martabe Gold Mine is located in North Sumatra in the District of South Tapanuli. The area covered by this agreement is 1,639 km², however, the area of operations at the close of 2017 was limited to 452 hectares.

There are six defined mineral deposits at the Martabe Gold Mine. These deposits are of a type known as high sulphidation epithermal deposits and comprise part of a large-scale mineralised district which has the potential to host further gold and gold-copper deposits.

The Martabe Gold Mine is located in North Sumatra and consists of multiple open-cut pits and a conventional processing plant for gold and silver bullion production. Operations began in 2012 and since developed a reputation as an industry-leading example of excellence regarding safety, sustainability, and production processes.

Mining operations are located in an elevated hilly area bordering the Batangtoru Forest. The support facilities for the mine are mostly located in a lowland area adjacent to the trans-Sumatera highway. The surrounding area includes native forest, rubber and oil palm plantations and rice paddies, with nearby rural villages and townships.

Ore is mined from shallow pits of the mineral-rich hills of the Martabe Gold Mine. The Purnama Pit started its operation in 2011 and mining of the Barani and Ramba Joring Pit started in 2016 and 2017 respectively. In 2018, mining at the Tor Ulu Ala deposit was approved. Waste rock or overburden from the pits is placed in the Tailings Storage Facility (TSF) embankment rather than in waste dumps as is the case in most other mines.

Ramba Joring Pit
The Ramba Joring pit is divided into two sections, namely the Northern and the Southern area, due to the hilly topography and mineral resources. The areas are at different stages of operations; the northern part being wide open and fully operational, whereas the southern part is still under the process of widening and due to its restrictive operating width it can only be mined during the day.

Barani Pit
The main concentration of mining-focused around the northern part of the Barani Pit, which is part of the TSF construction plan. This area will be mined until its final design and then be backfilled.

Purnama Pit
The oldest pit of the Martabe Gold Mine had a solid performance in 2020 with 7.0 million tonnes of material produced, the same amount as in 2019.

A conventional Carbon-In-Leach (CIL) plant is the process plant at the Martabe Gold Mine with a capacity that exceeds 6 million tonnes of ore per annum. The process plant is operated continually with the exception of maintenance shutdowns.

It is relatively simple to extract gold and silver from the Ore, the key steps are:

• Ore crushing.
• Grinding and conversion of the ore-forming slurry.
• Using cyanide to leach the gold and silver from the slurry.
• Adsorption of gold and silver in solution onto carbon granules.
• Using a process called elution to remove gold and silver from the carbon granules.
• Using electrowinning to recover gold and silver.
• Smelting to produce dore bullion (gold and silver) bars ready for shipment. All bullion produced at the Martabe Gold Mine is refined in Jakarta.

After the gold and silver has been removed from the slurry, the remainder, called tailings, undergoes a pro ........