Cosalá Operations
| San Rafael | |
| San Rafael is an attractive near-term development project with a large defined resource and attractive expansion opportunities. The deposit is being evaluated as a low-capital, underground project that can commence production as early as 2017. Environmental Impact Statement (EIS) approval has been received for an underground operation. The site is located about 12 km north-northeast of the town of Cosalá and 17 km by road from the Nuestra Señora processing facility. San Rafael-type mineralization consists of massive sulfides that occur at an unconformable contact between what is believed to be Tertiary volcanic tuff and Cretaceous limestone. Most of the massive sulfide mineralization appears to be hosted in the volcanic tuff. San Rafael contains silver, lead, and zinc mineralization with minor gold and copper. The main minerals are pyrite, pyrrhotite, sphalerite, and galena with minor marcasite, chalcopyrite, and magnetite. In the San Rafael Main Zone, this mineralization is often associated with quartz, sericite and pyrite alteration minerals. It has also been suggested that San Rafael displays many similarities to volcanogenic massive sulfide deposits, such as those found in the Guerrero Terrane in central Mexico. At San Rafael, a dacite tuff is the primary host for the mineralization. Part of the same area, the 120 Zone of San Raphael in contrast is hosted by skarn zones developed along dykes cross-cutting the underlying limestone units. | |
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