Siou Development


Siou is a high-grade gold deposit located some twenty kilometers from the Mana Mine in Burkina Faso. Open-pit production commenced in early 2014, and development of Siou underground began in the third quarter of 2018.


  • Siou proven and probable reserves of 3.0M tonnes at 5.29 g/t Au for 0.5M oz
  • Siou proven and probable open-pit reserves of 1.6M tonnes at 3.57 g/t Au for 0.2M oz
  • Mining: underground
  • Processing: 2,000 tpd contract operation
  • Mine life: +8 years*
  • Pre-production capital expenditure: $51.7 million
  • Development time: 18 months
  • During the five-year period between 2019 and 2023, we target
    • Average production of 209,000 oz
    • Average all-in sustaining cost of $871/oz
  • Ownership: 90%

*based on year-end 2017 mineral reserves and resources.


Mana Pre-feasibility Study


The Mana pre-feasibility study investigated the potential for extracting the deeper zone of the Siou deposit using underground mining operations, mainly long-hole stoping. Access to the operations will be through a single portal and a 5.5- by 5.5-meter ramp at a 14-gradient slope. The location of the portal will allow mining in the northern part of the Siou pit to continue uninterrupted. The ultimate size of the underground mining operation will be more than 600 meters along strike by 200 meters deep.                

The figure below illustrates the underground mining layout for the Siou mine.


Timeline for Development of Siou Underground

2018 Exploration

A budget of $7 million has been allocated to an exploration program comprising 10,000 meters of core, 25,000 meters of RC and 60,000 meters of auger drilling at Mana. The bulk of the core drill work will be directed to the Siou area with the aim of expanding the newly discovered lens in the north part of Siou at depth.

More on the 2018 programme