Interpretations of these bodies are based on mineralized intercepts, characteristics of the massive sulfide mineralization, known strike and dip of the host black chert unit and structural controls of mineralization at El Roble. Textures and metal content in the mineralized bodies discovered to date are consistent with zoning patterns found in other volcanogenic massive sulfide (VMS) systems and suggest that further mineralization remains to be discovered near the mine.
Zeus and Aquiles massive sulfide bodies
Drill hole ATDHR-27 has multiple intercepts of massive sulfides which show characteristics of both Zeus (high grade copper) and Aquiles (high grade gold) styles of mineralization, including a 34.7 meter halo of gold mineralization grading 2.3 g/t. This interpretation suggests that the two bodies might be connected and may have a combined thickness of at least 65 meters. The Aquiles style of mineralization represents the top of the VMS deposit, with lower copper but relatively strong gold values, while the higher grade copper content of the Zeus body represents mineralization at stratigraphically lower levels of the VMS deposit.
Ares massive sulfide body
The newly discovered Ares body is located at the north end of the 360-meter strike of the El Roble mine's mineralized system and extends 75 meters below and adjacent to the known base of the Zeus body. Ares was intersected by drill holes ATDHR-28 andATDHR-29, which encountered 49 meters and 25 meters, respectively, of copper mineralization. Grades in these intersections are higher than the historical average grade of ore mined at El Roble.
Metal zoning suggests that the Ares body is a more distal facies of the Zeus-Aquiles bodies but possibly displaced slightly by faulting. This interpretation suggests that the Ares-Zeus-Aquiles body has the potential to be the largest massive sulfide body discovered to date at the El Roble mine (see Figure 1 http://www.aticomining.com/i/pdf/Schematic-models.pdf).
Orion Massive sulfide Body
This body has been intersected by Minera El Roble above level 2000 and found to continue at depth. It is located very close to the south along strike of Apollo and 50 meters above Maximus. It has been constrained by
18 drill holes by Minera EL Roble independently assayed and logged by Atico. Mineralization is similar to Apollo with massive textures and higher Au-Ag values.
Development of exploration concepts
The continuing discovery of massive sulfide bodies such as Ares-Zeus-Aquiles, Maximus, Goliath, Orion, Apolo and Andromeda has provided data that supports and enhances the current exploration model of the El Roble VMS system. Stockwork feeder mineralization in Orion and the stratigraphic footwall of Maximus and Goliath shows that the feeder system has dimensions of at least 100 meters by 100 meters. The discovery of the Ares body confirms the current zoning model of the mineralization and supports the concept of finding additional mineralization lateral to and below the existing drill intercepts.
The presence of a strong gold-silver halo in the "black chert' unit enclosing the mineralization is becoming a powerful exploration indicator, which may also have important implications for the economics of the El Roble project. Atico will to use its growing understanding of the El Roble VMS deposit to continue exploring for new massive sulfide bodies in the near-mine environment. Additionally, the company will apply those concepts to exploration within the 10 kilometer strike of prospective host horizon within El Roble's highly prospective land package of more than 6,600 contiguous hectares.
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