Martabe Gold Mine

The Martabe Gold Mine, located approximately 40 km southeast of Sibolga in North Sumatra, Indonesia, is an operating gold mine that processes 4.5 Mt of gold ore per year. Co-disposal of waste occurs with all open pit mine waste utilized in the construction of the tailings storage facility (TSF) embankment. The mine also includes a process plant, stockpiles, water treatment plant, sediment control dams, and several other facilities.

Located on the Sumatra Island, Indonesia, the Martabe plant consists of crushing, grinding, leaching/CIL, carbon regeneration, cyanide detoxification, tailings storage facility and water polishing to produce a gold/silver product.

Ownership

100%

Mineral Reserve

0.49Moz
of gold

Gold production

86koz

All-in sustaining costs

$2,198/oz

Capital expenditure

$55m

Workforce

1,837

Overview and locality

The Martabe project is seen as one of the more promising undeveloped mineral deposits in Asia, containing extensive proven reserves of gold and silver.

The Martabe Contract of Work (CoW) covers a 2,500km² area, the most significant part of which is the Purnama deposit.

A brief history

The mine is a sulphidation epithermal deposit, which was discovered in 1997 through regional stream sediment sampling by Normandy Anglo Asia Ltd. Since then other deposits have also been discovered and resources at Martabe now stand at 6.73Moz of gold and 68.31Moz of silver.
Martabe’s high sulphidation gold deposits exist within a sequence of tertiary volcanic and sedimentary rocks near a fault splay which is part of the Great Sumatran Fault complex.
Episodic fault activity has been responsible for pulses of high-level magmatism and development of multi-stage phreatomagmatic breccias, flow dome complexes, hydrothermal alteration and gold mineralisation observed in the district.
Gold mineralisation occurs in a number of deposits over a strike length of 7km.
The most significant and best defined of these is the Purnama deposit, where a resource of 66.7 million tonnes containing 1.74g/t Au and 21.5g/t Ag for a total of 3.7 million ounces of gold and 46 million ounces of silver has been defined by diamond drilling.The most significant and best defined of these is the Purnama deposit, where a resource of 66.7 million tonnes containing 1.74g/t Au and 21.5g/t Ag for a total of 3.7 million ounces of gold and 46 million ounces of silver has been defined by diamond drilling.
Two adjacent deposits, Baskari and Pelangi, plus primary gold potential at depth and other virgin targets are expected to provide upside. Total resources are 7Mt. Reserves are 32.3Mt.

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