The San Andres Mine is a heap leach operation with two stages of crushing.  Mining at the San Andres Mine is currently carried out by local contactor using conventional earth-moving equipment.  Current production is approximately 4,200,000 tonnes of ore per annum with an additional 1,100,000 tonnes of waste moved annually.

The crushing circuit consists of a primary jaw crusher and secondary cone crushers, which reduces the ore size to a nominal 80% passing three inches for leaching.  The ore is friable so a significant amount of fines is produced during the crushing stage.  These fines are agglomerated using a combination of cement and lime.   The crushed and agglomerated product are transferred to a series of conveyors to distribute the material on to the leach pads in 6 metre lifts for leaching.  A conventional carbon absorption facility (ADR plant) is used to recover the gold from process solutions and produce a final gold dore product.  A new primary crusher conveyer and agglomerator facility is currently being constructed at the San Andres Mine.  Once completed this will significantly reduce the ore haulage costs and allow an increase in production of up to 5,600,000 tonnes per annum of ore.