Sierra Madre Gold and Silver Ltd. provided an update on its exploration activities at the 100% owned past-producing La Guitarra Silver-Gold Mine Complex ("La Guitarra") in Estado de Mexico, Mexico, 130 km southwest of Mexico City. Beginning in February of this year, the company started a 2,000-scale geologic mapping program, first in the eastern portion of the Temascaltepec mining district and then progressing to the west side. This mapping program is the first-ever project-wide undertaking.

It provides additional data for understanding the structural controls on the vein-hosted silver and gold mineralization. District-Scale Mapping by Sierra Madre: To date, surface mapping has delineated nearly 53 km of mineralized quartz veins, breccias, and stockwork zones. Mapping in the Eastern district has delineated over 37.9 km of veining.

The dominant strike direction of veining is to the northwest, accompanied by a second set of veins, known as antithetic structures, striking more easterly. Both groups of veins host gold and silver mineralization, with hundreds of old shafts, cross cuts, adits, and prospect pits having been located. Host rocks for the veins are metasediments and andesites.

Approximately one-half of the area mapped thus far is covered by recent basalt flows, with the veins exposed in erosional windows. Mapping has been completed over a significant portion of the West district. Thus far, over 15 km of veins have been located at the surface.

While the principal vein systems, Guitarra, Coloso, and Nazareno, have been exploited, the vein swarm north of Guitarra has yet to be drill tested despite having numerous old shafts, adits, and prospect pits. Next Steps: A surface and underground sampling program will commence as soon as the rainy season is over. The results of this program will provide information on the most favorable structural settings for silver and gold deposition.

Results from this work will be used to plan exploration drilling programs in the East and West districts.