Algo Grande Copper (WKN A41UK1 / TSXV ALGR) has once again delivered strong results at the conclusion of the first drilling phase at the highly promising copper, silver, and gold project Adelita. This time the company, led by CEO Enric Gay, has confirmed copper equivalent grades of up to 3.9%!
Algo Grande has drilled a total of four holes totaling 1,998 meters at the Cerro Grande skarn target, presenting not only compelling metal grades but also new, important data on the structure and extent of mineralization at the project in Sonora, Mexico.
The goal of confirming high-grade skarn mineralization at depth was achieved, and according to the company, the results also show that the mineralization system is more extensive than previously assumed and extends beyond the boundaries of earlier drill holes!
The focus of the current announcement is on drill hole AG_GC_003. There, Algo Grande intersected a broad zone of strong copper, gold, and silver mineralization measuring 18.2 meters at 1.8% copper equivalent. This interval contained 1.2% copper, 28.2 grams of silver, and 0.7 grams of gold per ton. Within this interval, there was also a higher-grade sub-section of 3.5 meters with 3.9% copper equivalent, consisting of 2.4% copper, 61.1 grams of silver per ton, and 1.8 grams of gold per ton. At the same time, the company notes that AG_GC_003 did not fully reach the planned target area due to a drilling deviation but nevertheless delivered the strongest section of the program.
According to Algo Grande, the results from drill holes AG_GC_002, AG_GC_003, and AG_GC_004 demonstrate both the lateral and vertical continuity of the system. Although AG_GC_001 did not encounter any significant mineralization, the three remaining drill holes intersected several mineralized skarn intervals. In total, 104.76 meters with more than 0.8% copper equivalent were recorded across all four drill holes. These intervals include both skarn mineralization and mineralized wall rocks and incorporate internal dilution. They are therefore not presented as individual discrete skarn intervals, but they illustrate the scale and continuity of the mineralized system.
Algo Grande defines five skarn horizons at Cerro Grande
A key result of the program is the identification of at least five distinct skarn horizons within the system. Three of these horizons are new discoveries. This is a crucial finding for Algo Grande because a model featuring multiple superimposed mineralized zones significantly increases the vertical extent and the potential tonnage profile. In comparable porphyry skarn systems, stacked horizons indicate multiple mineralization events and changing fluid pathways. Locally, such horizons can coalesce into thicker and higher-grade zones.
The Cerro Grande system is exposed at the surface. This is significant for exploration because the mineralization is not deeply buried and can be directly observed and specifically tracked. Together with the proven vertical continuity and the multiple stacked horizons, this paints a picture of a large-scale and long-lived hydrothermal system. According to the Company’s assessment, the mineralization remains open both along strike and at depth.
Mineralogically, the mineralization is described as consisting of two dominant skarn types. On the one hand, there are magnetite-rich skarns with abundant chalcopyrite. On the other hand, garnet-dominated skarns occur, in which chalcocite and bornite represent the primary copper sulfides. These differences in mineral composition indicate varying conditions within the hydrothermal system and are consistent with the metal zoning frequently observed in porphyry-related skarn environments.
Metal zonation provides evidence of a possible porphyry system
In addition to the skarn intervals themselves, Algo Grande also highlights the geochemical indications of a deeper porphyry center. The strongest skarn intervals are characterized by elevated copper, silver, and gold grades. This combination corresponds to the pattern typically observed in skarn deposits near porphyry centers.
Also, molybdenum intervals were identified in several drill holes that are spatially separated from the high-grade copper-silver-gold sections. In AG_GC_002, 1.04 meters grading 1,440 ppm molybdenum were intersected between 288.40 and 289.44 meters, between 333.0 and 333.8 meters, 0.8 meters with 2,820 ppm molybdenum, and between 545.83 and 546.35 meters, 0.52 meters with 1,000 ppm molybdenum. In AG_GC_004, 0.9 meters grading 521 ppm molybdenum was recorded between 274.5 and 275.4 meters.
According to Algo Grande, these molybdenum enrichments are often associated with intrusive phases, including andesitic porphyry fingers and potassium-rich alteration zones surrounding quartz-calcite veins. The company considers the separation between molybdenum and skarn-hosted copper mineralization to be a typical characteristic of established porphyry-skarn systems. This provides a geochemical vector pointing toward a potential intrusive source at greater depth.
Phase II is aims to expand the footprint and test deeper targets
With the successful completion of the first program, Algo Grande is now turning its attention to the next exploration phase. The company intends to implement a systematic, district-scale strategy at the Adelita Project. This includes a LiDAR survey of the entire project area, magnetic drone surveys, and results from a systematic soil sampling program. Based on this, new drill targets along the six-kilometer-long skarn corridor will be defined.
The Phase II drilling program is scheduled to begin in May 2026. Plans include step-out drilling to extend the known skarn horizons, deeper drilling to test the porphyry targets, and initial testing of newly defined targets at the district level. For Algo Grande, this means that Cerro Grande is no longer viewed solely as a single skarn target, but rather as part of a larger mineralized system within the Adelita Project.
The results from Phase I to date have thus delivered one thing above all: a clearer geological model. Algo Grande has confirmed a surface-trending, vertically extensive multi-horizon skarn system with copper, silver, and gold mineralization, while also identifying geochemical indications of a potential porphyry center at depth. The next drilling phase is now intended to show how far this system extends laterally and at depth.
The above text is a promotional release on behalf of Algo Grande Copper.
