Seven companies announced results from diamond drilling campaigns in Mexico during the week. Since September of 2022 not that many companies had released such number of drilling results on any given week.
Regency Silver returned the highest gold intercept at its Dios Padre project in Sonora. The company is doing step-out holes to define the shape of the mineralized bodies. Dios Padre sits within the Santa Rosa de Yecora district, known for multiple occurrences of breccia bodies related to a Cretaceous-Eocene granodioritic batholith intruding andesitic rocks of the Lower Volcanic Group. The batholith contacts are ragged, with a rough circular shape 20 km across when all its outcrops are accounted for. Mineralization in the district is mainly within breccia bodies (often tourmaline bearing) developed at the contacts or within the intrusive rocks, some of which present porphyry copper style mineralization. At Dios Padre the breccias are strongly zoned with Ag-Cu mineralization in the shallower levels that turn into Cu-Au with depth reflecting the increase of temperature within the system.
Heliostar Metals presented results from drilling the Veta Madre pit area at its La Colorada mine in Sonora. The aim of the program is to expand mineralization to allow for a pit cutback intended to commence on Q3 2026. The company completed a technical report with good although scant descriptions of the mineralization, on which the following paragraphs are included: “The deposit type is not well constrained, and a number of deposit types have been suggested. The El Crestón deposit appears to be situated between possible deeper copper porphyry mineralization and a near-surface epithermal environment. Veta Madre is characterized by the presence of breccias and multi-stage quartz veins, developing crustiform textures, banding, and blade textures. Veta Madre is mostly in an advanced state of oxidation, with occasional fresh pyrite and traces of galena and sphalerite observed. The mineralization is mainly associated with quartz veining that occurs in multiple stages …. Occasionally barite and magnetite are identified …. Silver-rich mineralization is associated with polymetallic veinlets of galena, sphalerite, argentite, and occasionally traces of chalcopyrite.”
Endeavour Silver has completed since 2025 forty-three drill holes totaling 7,015 m on the La Luz system and ten drill holes totaling 1,904 m on the Terrenora vein at its Terronera mine in Jalisco. The program focuses on adding resources and helping with mine development plans. As set on the technical report: “…silver and gold mineralization represents the upper portion of an epithermal vein system. Illite, sericite and adularia are characteristic alteration assemblages that typically occur in the veins and in the vein wall rocks… Metallic minerals include galena, argentite, and sphalerite associated with gangue constituents of quartz, calcite and pyrite … comprises classic, high grade silver- gold, epithermal vein deposits, characterized by low-sulphidation mineralization and adularia-sericite alteration”.
Mercado Minerals released results from its 3,000 m inaugural drill program at its Copalito project in Sinaloa. The present news report on holes extending the mineralization footprint of the 5 Señores vein, and the first holes on El Agua vein. Mineralization has been described as of intermediate sulfidation epithermal character.
Impact Silver announced new drill results on the north extension of the Carlos Pacheco vein system at its Nochebuena mine in Estado de México. “Surface drill results reported in this news release are additional holes on the north extension of the Carlos Pacheco Vein and its splay veins for 150m north of the active mine workings …” According to the 2005 technical report, “Silver mineralization at Zacualpan is of the class known as silver-rich intermediate sulphidation epithermal vein deposits.”
Capitan Silver reported additional results from eight holes of the 60,000 m drill program at its Cruz de Plata project in Durango. Current drilling is extending mineralization downdip on the Jesús María trend. Mineralization on the Jesús María trend presents characteristics of intermediate sulfidation epithermal systems, whereas the Capitan Hill zone mineralization is more akin to low sulfidation epithermal systems.
Oroco Resource reported assay results from its phase 2 resource definition drilling program, focused on the South Zone of its Santo Tomás project in Sinaloa. “Phase 2 is designed primarily to convert Inferred resources to the Indicated resource classification in the South Zone and to collect geotechnical, hydrogeological, and additional metallurgical data required for Pre-Feasibility Study (“PFS”) level mine-planning”. Santo Tomás is a porphyry coppery system with gold and molybdenum credits.
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