Cerro Corona mine - Key developments and material issues

  • Cerro Corona remains the lowest cost producer in the Group (AIC at US$203/oz in 2017), producing high-margin gold and copper
  • A completed PFS supports a material increase in the Resource to Reserve conversion resulting in a major seven-year LoM extension to 2030
  • Oxides sale credit envisaged from July 2018

The LoM extension PFS included a risk assessment scoped at identifying the risks to achieving the investment outcomes through a review of the technical, sustainable development and financial components of the project.

The collection of data and test work over an 18-month project study period has resulted in appropriate risk mitigation factors built into the LoM design, including:

  • Potential seepage from the existing TSF mitigated by the use of containment blankets, a compacted clay barrier, underlain by drainage aggregate, drainage piping and concrete risers
  • TSF deformation analysis shows the integrity of the current TSF 3,803m amsl design, with an appropriate factor of safety (FOS) applied
  • Hydrogeological studies demonstrate an appropriate hydrogeological containment level for the in-pit TSF until 3,710m amsl (~30 m above tailing depositional model design)
  • There is a phased process in place, to submit and secure approvals for the relevant permits to underpin the life extension project, which will align to the feasibility study that will be undertaken in 2018