Open-pit mining at the San Andres Mine commenced at the Water Tank Hill deposit. This pit was depleted by early 2003 and is currently in the reclamation process. Mining began in the East Ledge pit in early 2003. Mining at the East Ledge pit is currently shut down and will resume once the expansion plan implementation is underway. Present production at the San Andres Mine is entirely from the Twin Hills open-pit operation. Waste rock from the Twin Hills pit is currently being used to fill and reclaim the upper southeast side of the East Ledge pit.
From 1998 to 2011, the San Andres Mine treated approximately 39 million tonnes of material at an average grade of 0.86 g/t Au. Currently, the mine produces approximately 400,000 tonnes of ore per month. Since acquiring the mine in August 2009, a new primary crusher-conveyor system has been installed and has significantly reduced haulage distances and improved efficiency of the system. During the first quarter of 2012 a new mine contractor with a proven track record was commissioned to take over the mining operations.