Overview
Stage | Production |
Mine Type | Open Pit |
Commodities |
|
Mining Method |
|
Production Start | ...  |
Mine Life | 21 years (as of Jan 1, 2021) |
The Toka Tindung Gold Mine is one of the largest gold mining operation in Southeast Asia. Toka Tindung Gold Mine open pit mining complex consists of several open pits, including the active producing open pits: Toka, Araren and Kopra, and the Alaskar, Talawaan and Marawuwung open pits, which are in pre-production. |
Source:
p. 4

Operating Companies: PT Meares Soputan Mining (“PT MSM”) & PT Tambang Tondano Nusajaya (“PT TTN”); both are wholly-owned subsidiaries of PT Archi Indonesia Tbk.
Contractors
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Deposit Type
- Epithermal
- Vein / narrow vein
Summary:
The Toka Tindung Gold Mine area is located on the eastern margin of the South East Asia Plate within the SulawesiEast Mindanao magmatic arc, a highly mineralised belt of volcanics and high level intrusives of early Miocene to Quaternary age. A series of north-northwest–south-southeast trending faults define structural corridors which host the deposits. The deposits are low-sulfidation epithermal systems.
Low-sulphidation epithermal gold mineralisation within the Project area occurs in shoots that form at dilational sites along quartz vein-hosted structures.
The Toka Tindung deposit lies at the northern end of a series of north-northwest trending faults. These faults define a structural corridor at least 2 km wide and extending for about 15 km south of Toka Tindung Gold Mine. The mineralised system is up to 200 m wide and has been delineated over a 1.2 km strike extent. The gross trend of the stockwork zone and larger veins at Toka show a north strike, with the veins generally near vertical or dipping steeply to either the east or west. Local variations in dip, strike and width occur along individual veins within the stockwork system.
The main structural elements in the Batupangah area are brittle faults and fractures with north, north-northeast and northwest mineralised trends. These structures are interpreted to be block faults and have dips generally steeper than 60°. In summary:
- At Pajajaran, two subvertical, parallel sheeted veins ........

Summary:
Toka Tindung Gold Mine commenced overburden mining in 2009 and production mining operations in January 2011.
The Toka Tindung Gold Mine open pit mining complex consists of several open pits within an area spanning approximately 10 km2. These include the active producing open pits; Toka, Araren, and Kopra, as well as the Alaskar and Marawuwung open pits, which are in pre-production and due to commence production in 2021 and 2024, respectively. The Pajajaran and Blambangan open pits have been mined out (completed) and are being backfilled with waste rock from other operating open pits. This area also includes the Toka, Batupangah, Pajajaran and Kopra WRDs.
Since mining inception, Archi has successfully transitioned the Project to a multi-open pit operation with initial mining commencing at Toka (2011), Pajajaran (2011), Kopra (2012), Blambangan (2013) and Araren (2015).
The geotechnical design parameters are bench heights either 15 m or 20 m, berm widths varied between 5 m and 10.5 m, and batter angles between 34° and 70°, dependent on the open pit depth and rock type (oxidised, transitional and fresh). The general open pit design parameters are ramp widths of 15 m (single lane) and 25 m (dual lane) and ramp gradients of 10%.
Final designed open pit depths are:
No Open Pit Name Design Depth(m)
1 Toka - 170;
2 Marawuwung - 105;
3 Alaskar - 165;
4 Kopra - 195;
Source:

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Flow Sheet:
Summary:

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Production:
Commodity | Units | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
Gold
|
koz
| ......  | ......  | ......  | 270 | 251 | 225 |
Silver
|
koz
| ......  | ......  | ......  | ......  | ......  | ......  |
Gold Equivalent
|
oz
| | ......  | ......  | ......  | ......  | ......  |
All production numbers are expressed as metal in doré.
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Operational Metrics:
Metrics | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
Total tonnes mined
| ......  | ......  | 19 Mt | | | |
Ore tonnes mined
| ......  | ......  | 3.5 Mt | 3,212 kt | 2,552 kt | 1,774 kt |
Waste
| ......  | ......  | 15.5 Mt | 21,828 kt | 27,417 kt | 23,879 kt |
Tonnes milled
| ......  | ......  | 3,304 kt | 2,350 kt | 2,160 kt | 1,880 kt |
Stripping / waste ratio
| ......  | ......  | 4.4 | 6.8 | 10.7 | 13.5 |
Annual milling capacity
| ......  | ......  | 3.3 Mt | 3 Mt | | |
Daily milling capacity
| ......  | ......  | | | | |
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Reserves at December 31, 2020:
The Mineral Resources are reported at a 0.2 g/t Au cut-off.
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
18.2 Mt
|
Gold
|
1.14 g/t
|
667 koz
|
Proven
|
18.2 Mt
|
Silver
|
2.6 g/t
|
1,521 koz
|
Probable
|
80.1 Mt
|
Gold
|
1.25 g/t
|
3,218 koz
|
Probable
|
80.1 Mt
|
Silver
|
2.56 g/t
|
6,597 koz
|
Proven & Probable
|
98.3 Mt
|
Gold
|
1.23 g/t
|
3,884 koz
|
Proven & Probable
|
98.3 Mt
|
Silver
|
2.57 g/t
|
8,118 koz
|
Measured
|
19.7 Mt
|
Gold
|
1.1 g/t
|
696 koz
|
Measured
|
19.7 Mt
|
Silver
|
2 g/t
|
1,583 koz
|
Indicated
|
97.2 Mt
|
Gold
|
1.3 g/t
|
3,942 koz
|
Indicated
|
97.2 Mt
|
Silver
|
3 g/t
|
7,969 koz
|
Inferred
|
28.8 Mt
|
Gold
|
1 g/t
|
890 koz
|
Inferred
|
28.8 Mt
|
Silver
|
2 g/t
|
1,401 koz
|
Total Resource
|
145.8 Mt
|
Gold
|
1.2 g/t
|
5,528 koz
|
Total Resource
|
145.8 Mt
|
Silver
|
2 g/t
|
10,953 koz
|
Pipelines and Water Supply
Source:

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