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;