San Andres is located in La Únion, Honduras and is an open pit, heap leach operation with a two-stage crushing circuit consisting of a primary jaw crusher and secondary cone crusher. The epithermal deposit contains gold occurring in colloform banded quartz veins.
The mine has a long history going back to the 1500’s during the Colonial period when it was the principal source of Honduran gold for the Spanish Crown. San Andres has been in modern production since 1983 and has well-developed infrastructure which includes a power and water supply, warehouses, maintenance facilities, an assay laboratory and an on-site camp.
Aura Minerals acquired the mine is 2009 and completed an expansion project consisting of new crusher-conveyor and stacking systems. This reduced ore haulage distances and increased throughput. The mine produced 82.3 kozs of gold in 2017 with recoveries averaging 97%. The Proven and Probable Reserves as of Dec. 2017 contained 1.1 Mozs of gold contained in 67.77 Mt of oxide and mixed material with an average grade of 0.50 g/t Au. The cut-off grades were 0.28 g/t gold for oxides and 0.37 g/t for mixed.
Aura announced that San Andres has produced 38,743 ounces of gold during the first half of 2018 at a cash operating cost of $903/oz. Aura has updated their 2018 guidance to 65,000-75,000 ounces at cash operating costs of $750-$925/oz at the San Andres mine.