Since 2012, the start of its operation the Martabe Gold Mine has had a well-deserved reputation as an industry leader in term of safety, sustainability, and production processes. With our people at the heart of the business, we use innovative practices and the latest technologies to discover new resources and to mine, process, move, and market our products to our customers safely and sustainably. We work collaboratively with our stakeholders to enhance our contribution to sustainable development in in North Sumatra and across Indonesia. And more importantly, we want our people and our communities to grow as we grow. We believe that only together we can build a sustainable future now, and tomorrow.
The total concession area containing the Martabe Gold Mine falls under a sixth-generation 30- year Contract of Work between PT Agincourt Resources (the company) and the Government of Indonesia. The initial area set in 1997 was 6,560 km2 but with some renunciations now sits at 1,303 km2 (130,252 hectares). However, following several renunciations, is now 130,252 hectares (1,303 km2) in size, located in South Tapanuli, Central Tapanuli, North Tapanuli and Mandailing Natal Regencies. The operational area of the Martabe Gold Mine itself within the concession is located in South Tapanuli Regency and currently covers an area of 509 hectares as of January 2022.
TIMELINE OF OWNERSHIP
Founded by Normandy
( JV and Anglo )
Majority owned by
Newmont East Asia
Acquired by G-Resources, Ltd
Acquired by a consortium led by EMR Capital
Acquired by PT Danusa Tambang Nusantara, a subsidiary of
PT Pamapersada Nusantara and
PT United Tractors Tbk, member of Astra
The Martabe Gold Mine is located on the Sumatran fault line, which supported the formation of mineral flow deposits, making it rich in minerals including gold and silver. Currently, we operate three open-cut pits – Pit Ramba Joring which opened in 2017, Pit Barani which opened in 2016, and Pit Purnama which opened in 2011– and run a conventional carbon-in-leach (CIL) gold ore processing plant, supported by infrastructure including haulage roads, a tailings storage facility, raw water storage tanks, sediment control dams, water polishing plant, a switchyard, fuel depot, workshops and warehouses. We also operate an analytic laboratory, housing camp, administration building, sports field and clinic to support our mining community in North Sumatra.
In 2021, we continued our investments in the Exploration Program, with the primary objective of identifying additional resources and reserves.
The pits of the Martabe Gold Mine provide the ore from which the gold is extracted. Prior survey, geo-technical analysis, and planning are essential in order to open a pit. During the mining, a variety of means are used to get the rock from the ground, transport the ore, manage the waste rock, and to do all of this safely.
Similar to most gold mining operations, Martabe Gold Mine disposes of tailings in a Tailings Storage Facility, an engineered embankment in a valley. A containment fitted upstream of the embankment stores the tailings while the embankment itself is made of a conventional rock-fill (the overburden) downstream construction and has several distinct internal zones, each serving a specific function.
Purnama Pit, the first to open, began in 2011, followed by Barani Pit in 2016, and Ramba Joring Pit in 2017.
Our process plant is a conventional Carbon-In-Leach (CIL) plant with a capacity of more than 7 million tonnes of ore per year. The process plant is continuously operated except for scheduled maintenance shutdowns. The extraction of gold and silver from the ore is relatively straight forward.
The essential steps are as follows:
Crushing of THE Ore
Grinding the ore and conversion of this into a wet slurry
Using cyanide safely to leach the gold and silver from the slurry
ELIMINATING GOLD AND CARBON GRANULES VIA AN ANELUTION PROCESS
adsorption of gold and silver in solution unto carbon granules
recovering gold and silver through electrowinning
smelting gold and silver to produce DORÉ bullion bars. The Martabe Gold Mine refines all of its bullion in certain location/city by third parties.