The Los Reyes Property is located along a prominent northwest-trending regional structure formed along the western margin of the Sierra Madre Oriental that hosts numerous high-grade current and past operating mines including Naica (26Mt @ 213g/t Ag, 5.9% Pb, 5.6% Zn and 0.4% Cu) and the Velardena district (+15Mt @ 175g/t Ag, 0.5g/t Au, 4.0% Pb, 5.0% Zn, and 2.5% Cu).
The property geology consists of a granodiorite intrusive 1.8 kilometers in diameter surrounded by Lower Cretaceous limestone and shales that dip vertically along the contact but flatten slightly outward from the contact with the granodiorite. The intrusive is coarse grained and contains abundant xenoliths of foliated biotite schist. Numerous small prospects occur surrounding the intrusion, containing copper mineralization related to skarn, fractures and narrow mantos, the strongest of which occurs along the eastern contact of the intrusion, in the area covered by the Los Reyes claim, for a length of 700 – 800 meters long by 100 meters wide orientated in a north – south direction. In this area the limestone has been altered to a distance of 50 to 100 meters from the intrusion. This target is entirely covered by the 36ha El Rey claim.
Figure 1: Property Geology, with Proposed and Historic Exploration
The strongest copper mineralization follows the intrusive – skarn contact zone and consists of hematite – magnetite with rich copper mineralization. The skarn consists of chlorite, epidote, hedenbergite and magnetite. On surface, the skarn locally contains weak disseminated galena and sphalerite. Further to the east, the skarn transitions to marble.
Figure 2: High-grade Cu oxide mineralization around one of the historic pits on the Los Reyes Claim
Locally the contact zone between the marble and skarn contains small pockets of lead and zinc mineralization which may represent a earlier mineralizing event related to the granodiorite intrusion and that the hematite-magnetite ore bodies with high-grade copper-gold mineralization located in the contact skarn zone representing a second and more economically important mineralizing event, possibly related to a younger intrusion sitting at depth near the granodiorite – skarn contact.
Mineralization along this contact consists of hematite, chalcopyrite, bornite, malachite, chrysocolla, azurite, tenorite, chalcocite and magnetite. Some siliceous breccias or jasperoids are also locally emplaced along this contact.