OPERATIONS Americas Region
CERRO CORONA | SALARES NORTE | |||||
Mining method | Open pit | Open pit | ||||
Operational infrastructure | Cerro Corona has one open pit mine and one copper-gold flotation facility. The mine houses the mining administration and maintenance facilities. | Mine and plant facilities, a warehouse, a camp, offices, an on-site power station, a fuel station, a potable water plant, and a water treatment plant comprise the infrastructure. Water will be sourced from a well field 12 kilometres away. | ||||
Mineral processing and TSFs |
To produce a copper-gold concentrate, the processing plant includes a standard primary crushing, semi-autogenous grind (SAG)/ball milling, and flotation circuit. The final concentrate is thickened and filtered before being stacked for 380-kilometer road transfer to the Salaverry port, where it will be shipped to copper smelters in Japan and Germany. The thickened rougher flotation tails and cleaner scavenger flotation tails are transferred to the TSF separately.
TSF embankments are built downstream from the process plant over the Las Gordas and Las Guilas gorges in a downstream/centreline fashion. The embankments (Las Gordas, Las Guilas, and La Hierba) are being built in stages using borrowed materials from limestone quarries. The embankments have a clay core made of pit material (oxide material). The TSF has 26.4Mt of remaining LoM storage capacity up to 3,803m relative level (mRL). |
The process facility, designed to handle 2Mtpa, will be built at 4,500m amsl, south-east of the main pit. The ore will be crushed, processed, and thickened before being pumped to cyanide leaching. A two-stage counter-current decantation (CCD) circuit will feed slurry from the leaching stage into a counter-current washing and solid liquid separation process. Metals in the solution will be recovered using the Merrill-Crowe technique, which involves zinc precipitation. A CIP circuit will scavenge any soluble gold and silver remaining in the tailings slurry collected from the underflow of the second CCD stage.
The dry stack TSF has a total design capacity of 24Mt and is placed above the south mine WSF. Trucks will bring filtered tailings to the TSF, where they will be distributed and allowed to dry to near their specified moisture content before being compacted. |
Cerro Corona mine – Peru
Cerro Corona's life extension to 2030 is based on accelerated mining, which is made possible by the provision of waste storage capacity and extensive stockpile management, so that starting in 2025, when the stockpile balance peaks, the LoM plan is based on ore processed from stockpiles with in-pit tailings disposal.
In 2021, a study was launched to investigate the viability of future life extensions, with a focus on a potential east wall pit cutback and a further review of TSF and waste storage facility (WSF) capacity. Additional geotechnical drilling and pit wall mapping were required as part of these ongoing research to describe the morphology of low-competency limestones.
PROJECT
Salares Norte – Chile
Salares Norte is a high-grade, epithermal gold-silver open-pit deposit in northern Chile's High Andes. On the basis of the positive FS and the Chilean authorities' clearance of the EIA, the Golden Mine Projects Board formally approved development of the Salares Norte project in April 2020. Salares Norte is expected to significantly alter the future profile of Golden Mine Projects by accelerating production growth and lowering the Group's AIC. The project is still on track and on budget, with first gold production projected in Q1 2023. Once operational, annual output is expected to be 350koz gold-equivalent for the first ten years.
Salient points
MINERAL RESOURCES
MINERAL RESERVES