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San Luis del Cordero - Geology
A central Tertiary quartz-feldspar-porphyry intrusive, which has an east-west extent of approximately 3 km and a north-south extent of approximately 1.5 km, penetrates Jurassic-Cretaceous sedimentary packages of limestone conglomerates (Ahuichila Fm.), shales and sandstones (Caracol Fm.), limestones (Cuesta del Cura Fm.) and shales, limestones, sandstones (La Casita Fm.). Contact metasomatic skarn development has occurred along the north, east and south sides of the intrusive, with the western boundary marked by a fault contact.

Vein Hosted Mineralization.

The most tested vein on the property is the Santa Rosa Vein, which has been tested by drilling over a 500 metres strike and down to a depth of 250 metres. It is high-grade and varies between 0.40 to 2.62 metres in thickness. In the early 20th century, past production extracted approximately 70,000 tonnes, grading 600-700 g/t silver and 2.0 % copper, along 150 metres and down to about 100 metres. Sampling by Altiplano of pillars on levels 1 and 3 averaged 570 g/t silver and 2.3 % copper. Tetrahedrite (Cu,Fe,(Ag))12Sb4S13 is the main copper bearing mineral, along with chalcopyrite CuFeS2, although in the oxidized zone, the secondary minerals malachite Cu2CO3(OH)2 and azurite Cu3(CO3)2(OH)2 are common. The second most explored vein is India Bonita, located 1 km to the northeast.

Skarn Hosted Mineralization.

The Santa Rosa East Skarn is delineated by grade and texture, rather than by structure. Intersections vary in core length from 2.19 to 30.60 metres, with an average true width of 9.0 metres. Most of this zone is covered by alluvium. This zone has been traced for about 700 metres along strike. There are also sub-parallel skarn zones to the main skarn. Overall, skarns have been traced around the intrusive, as well as adjacent to QFP dykes, for about 5.5 km.

On the eastern end of the skarn rim is the untested La Puerta Target. Small old pits and terreros expose hornfels, with grossular garnet as exoskarn, with malachite coatings on fractures. This target shows up strongly in the polymetallic soil geochemistry and has not yet been drilled.

On the southern side of the skarn rim is the Canal Zone Target, 1.3 km south of the Santa Rosa Mine. Both exoskarn and endoskarn can be seen along the contact, with different phases of intrusive, and mineralization in both the QFP and the sedimentary rocks. A little drift was sampled over 20 metres averaging 133 g/t Ag, 1.92 % Cu and 5.6 % Zn. Two drill holes have been drilled into this target, with hole PSLC-11-17 yielding 10.88 metres grading 59 g/t Ag, 0.3 % Cu and 7.2 % Zn. More drilling is warranted.

Geologic Outcrop Map

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