This week the drilling results presented by companies operating in Mexico are from two projects in the Guerrero Gold Belt, in southern Mexico.
Heliostar Metals announced results from the current 15,000 m drill program at Ana Paula, in Guerrero. To date 6,529 m in 24 holes have been completed on the program designed to best define the overall east-west orientation of the High Grade Panel. Heliostar rotated drilling by approximately 90 degrees from the majority of historic intercepts, demonstrating more continuous higher-grade gold mineralization within the High Grade Panel than previously recognized. Ana Paula mineralization is complex, even for the Guerrero Gold Belt. According to the technical report available at Heliostar’s website and SEDAR, four depositional settings are recognized at the project: “1. Polymictic Breccia hosted mineralization with mainly sulphide (arsenopyrite and/or pyrrhotite later replaced by pyrite) filling the matrix. 2. Exoskarn style sediment replacement and pyrite overprinting along intrusive contacts. 3. Micro-fractures with arsenopyrite fracturing all rock types, but best developed in the feldspar porphyries. 4. Disseminated sulphides in the feldspar porphyries, likely related to emplacement of V2 arsenopyrite microveinlets”.
Torex Gold Resources presented results to date from the 48,000 m 2025 drilling program at ELG Underground, primarily focused on advanced exploration and resource categorization in El Limón Sur and Sub-Sill trends. New high-grade mineralization along two second order structures running parallel to both the El Limón Sur and Sub-Sill trends was identified. There is an excellent description of ELG Underground geology on the press release (https://gambusinoprospector.com/wp-content/uploads/2025/10/2025-10-06-Torex-Gold-Drilling.-2025-10-06-txg-nr-1.pdf). “The ELG Mine Complex, located in the central part of the Guerrero Gold Belt in southwest Mexico, is hosted in the Mesozoic carbonate-rich Morelos Platform which has been intruded by Paleocene granodiorite stocks, sills, and dikes … Skarn-hosted gold mineralization develops along contacts of the intrusive rocks and carbonate-rich sedimentary rocks of the Cuautla and Morelos Formations, as well as along the footwall contact of the Mezcala Formation… Gold mineralization at ELG occurs in spatial association with a skarn body that was developed along a two-kilometre long corridor following the northeast contact of the ELG granodiorite stock. The skarn zone that occurs at the marble stratigraphic level of the Morelos Formation is in contact with hornfels developed in the Mezcala Formation… Zones of coarse, massive, garnet-dominant skarn appear within and along the stock margin, with fine-grained pyroxene-dominant skarn more common at greater distances from the contact with the stock. Significant gold mineralization at ELG is spatially associated with the skarn, preferentially occurring in pyroxene-rich exoskarn but also hosted in garnet-rich endoskarn that has been affected by retrograde alteration, which suggests that the most important gold event is strongly related to bismuth, late stage, and of epithermal origin”.
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