The Gualcamayo mine is an open pit and underground mine and heap leach operation that reached commercial production in 2009. The process facility at Gualcamayo is designed to treat 24,000 tpd and includes a primary, secondary, and tertiary crushing circuit. Gold recovery of approximately 60% is achieved with heap leaching and activated carbon in an ADR plant where gold doré is produced and sent to a refinery.
Mineros announced in June 2021 that the Gualcamayo Mine Mineral Reserves are expected to be depleted by the end of 2022, although a minimal amount of gold will continue to be recovered from stockpile material in 2023 and 2024 through heap leach processing.
The focus is now on the Gualcamayo Deep Carbonates Project (DCP), which is currently under internal study. As of December 31, 2022 Measured & Indicated Mineral Resources, exclusive of Mineral Reserves, for Gualcamayo DCP are estimated to total 19.8 Mt at a grade of 3.3 g/t gold for 2.1 Moz gold. In addition, Inferred Mineral Resources were estimated at 3.5 Mt at a grade of 3.4 g/t gold for 376,000 oz of gold based on cut-off grades of 1.5-2.0 g/t gold.