Algo Grande Reports Phase II Drill Update and UAV Magnetic Survey Results at Adelita; Multiple Porphyry Centers Identified at Depth
Algo Grande Reports Phase II Drill Update and UAV Magnetic Survey Results
at Adelita; Multiple Porphyry Centers Identified at Depth
• Phase II drill program progressing ahead of schedule: the first drill hole has been
successfully completed, and the program has advanced to Hole 002 of the planned 21-
hole, approximately 8,000-metre campaign. A second drill rig is expected to mobilize to
site within the coming days. The Company is targeting a first batch of assay results in
August 2026.
• 3D magnetic vector inversion identifies three interpreted porphyry-related intrusive
centers at depth across the Adelita district: Mezquital, a deep magnetic source beneath
Cerro Grande Central, and a newly identified body south of the Cerro Grande skarn - the
La Corona target - suggesting a multi-center intrusive system underlies the Adelita
district.
• Cerro Grande skarn corridor resolved into multiple discrete, stacked magnetic
bodies: UAV survey delivers approximately 7x improvement in spatial resolution over
the previous airborne dataset, resolving the corridor into a series of stacked magnetic
highs, consistent with additional skarn potential along strike that remains entirely
undrilled beyond the known discovery.
• Mezquital porphyry target precisely defined: the dipolar anomaly is now constrained
at approximately 2.2 kilometres by 700 metres with a peak amplitude of approximately
2,100 nT and an interpreted vertical extent of approximately 750 metres, consistent with
a substantial near-surface magnetite-bearing intrusive body.
• Structural targeting model validated property-wide: Four structural families,
confirming the NW-SE × N-S structural intersection as the primary control on the Cerro
Grande discovery and identifying multiple new untested structural intersections across
the 5,895-hectare property.
VANCOUVER, British Columbia — July 8, 2026 — Algo Grande Copper Corp. (“Algo
Grande” or the “Company”) (TSX-V: ALGR | OTC: ALGRF | FRA: KM00) announces results
from the completed interpretation and 3D magnetic vector inversion (MVI) of its high-resolution
UAV magnetic survey at the 100%-owned Adelita Project, Sonora, Mexico. The survey
comprised approximately 1,200 line-kilometres of magnetic data acquired in two phases during
March and May 2026 by GSM Geoscience. The completed interpretation confirms the structural
controls underpinning the Company’s ongoing Phase II drill program and, through 3D magnetic
vector inversion, identifies three interpreted porphyry-related intrusive centers at depth across the
Adelita district.
The Company also reports that the Phase II diamond drill program is progressing ahead of
schedule. The first drill hole has been successfully completed, and the program has advanced to
Hole 002 of the planned 21-hole, approximately 8,000-metre campaign across the Cerro Grande
skarn expansion, Cerro Potrero South maiden program, and Las Trancas maiden program. A
second drill rig is expected to mobilize to site within the coming days, which the Company
expects will expedite completion of the program. The Company is targeting a first batch of assay
results in August 2026.
Enrico Gay, CEO of Algo Grande Copper Corp., commented: “The detailed magnetics have
identified multiple intrusive centers at depth across a 6.5-kilometre corridor, each one a
potential engine driving the copper-silver-gold mineralization we see at surface. At Cerro
Grande we have a high-grade skarn above a deep porphyry source. At La Corona, a newly
identified intrusion with coincident copper anomalism that has never seen a drill bit. At
Mezquital, the largest magnetic body on the property with a molybdenum signature pointing to
porphyry mineralization at depth. Phase II drilling is now advancing along a 2.5-kilometre
prospective corridor at Cerro Grande, with a second rig mobilizing and first assay results
expected in August.”
Phase II Drill Program Update
The Phase II diamond drill program, being completed by Major Drilling Group International
Inc., commenced in June 2026. The first drill hole has been successfully completed, and the
program has now advanced to Hole 002. The program is designed to test 15 expansion holes at
the Cerro Grande skarn over approximately 7,200 metres, three maiden holes at Cerro Potrero
South over approximately 300 metres, and three maiden holes at the Las Trancas epithermal
target over approximately 600 metres, for a total of approximately 8,000 metres across 21 holes.
A second drill rig is expected to mobilize to site within the coming days, which the Company
expects will expedite completion of the program. The Company is targeting a first batch of assay
results in August 2026.
Resolution Improvement and Structural Validation
The UAV survey was flown at a nominal altitude of approximately 20 metres above ground with
traverse line spacing of 25 metres over the Cerro Grande targets and 50 metres over Mezquital,
Cerro Potrero, and Cerro Potrero South, resolving magnetic features at a spatial wavelength of
approximately 10 metres. This represents an approximately 7-fold improvement in spatial
resolution over the Company’s previous helicopter-borne VTEM survey, which resolved features
at approximately 70 metres (Figure 1). As a result, the NW-SE-trending magnetic corridor
hosting the Cerro Grande skarn system is now resolved as a series of discrete, elongate magnetic
highs rather than a single broad anomaly, consistent with multiple stacked skarn bodies along
strike. Other than the previously drill-tested Cerro Grande discovery, none of these newly
resolved magnetic bodies has been drill-tested.
Figure 1. Comparison of UAV and legacy VTEM magnetic data over the Cerro Grande corrido
Structural analysis of the magnetic dataset identified 1,277 lineament segments across four
structural families: NW-SE, interpreted as the primary Laramide magmatic and hydrothermal
corridor controlling porphyry emplacement and skarn mineralisation; E-W, associated with the
Las Trancas workings and late-stage epithermal targets; NE-SW, representing subordinate
Laramide conduits and porphyry dike controls; and N-S Basin and Range extensional faults,
controlling late-stage feeders and low-sulphidation epithermal systems. The Cerro Grande
mineralized zone is spatially coincident with the intersection of the dominant NW-SE corridor
and a N-S structure, confirming the structural trap model and providing a validated, repeatable
targeting criterion across the property (Figure 2). Systematic application of this criterion
identified multiple additional untested structural intersection nodes across the 5,895-hectare
property.
Figure 2. Property-wide structural lineament map with intersection nodes, where mineralization
is expected to concentrate
3D Magnetic Vector Inversion: Multiple Interpreted Porphyry Centers at Depth
A 3D magnetic vector inversion (MVI) was performed using Seequent’s VOXI Earth Modelling
platform on a 20-metre octree mesh. The inversion incorporated 87,676 data stations across the
full survey area and converged to a normalised root-mean-square (nRMS) data misfit of
approximately 1.0 after 13 iterations, consistent with the estimated 8 nT noise floor of the
dataset. Residual anomaly amplitudes following inversion were predominantly within ±0.53 nT,
confirming that the recovered model adequately explains the observed magnetic field within
estimated data uncertainty. The mesh extended to an elevation of −1,800 metres below sea level.
MVI, which independently models the full magnetization vector rather than assuming purely
induced magnetization, was selected because of the expected remanent magnetization
contributions from hydrothermal magnetite, pyrrhotite, and skarn mineralogy within the
porphyry-skarn environment.
Figure 3. Cross-section of the 3D MVI model showing the three interpreted intrusive centers at
depth: Mezquital, Cerro Grande Central deep source, and La Corona
The MVI results identify three interpreted porphyry-related intrusive centers at depth across the
Adelita district, as shown in the depth cross-section in Figure 3.
Figure 4. Plan-view UAV TMI map showing the surface magnetic expression and coincident Cu
rock and soil geochemical anomalism of the three interpreted porphyry intrusive centers across
the Adelita district: Mezquital, Cerro Grande Central deep source, and La Corona. (See the
technical report on the Adelita Project prepared in accordance with NI 43-101, dated effective
August 15, 2025, available under the Company's profile at www.sedarplus.ca).
Mezquital
The Mezquital anomaly, the largest and most intensely magnetic feature in the dataset, presents a
dipolar footprint of approximately 2.2 kilometres by 700 metres with a peak amplitude of
approximately 2,100 nT. The interpreted source body is constrained to approximately 700 by 400
metres, and an interpreted vertical extent of approximately 750 metres, with an adjacent deeper
magnetic source also identified in the inversion (Figure 4). The MVI magnetic susceptibility of
approximately 0.05 SI is consistent with a substantial magnetite-bearing granodioritic intrusive
body. A historical drill hole within the anomaly intercepted magnetite- and hematite-bearing
granodiorite with propylitic alteration and an associated molybdenum signature at 50 to 150
metres depth, consistent with a porphyry-proximal intrusive or alteration domain. Mezquital is
interpreted as a high-priority porphyry target for a future exploration phase.
Cerro Grande Central
The MVI section beneath the Cerro Grande Central skarn indicates the presence of a broad, high-
amplitude magnetic body at depth, interpreted as a possible porphyry-related intrusion and the
deeper magmatic source for the hydrothermal system responsible for the surface skarn
mineralization (Figure 4). This relationship is consistent with the observation that the highest-
grade copper intercepts at Cerro Grande Central occur within zones of lower magnetic
susceptibility adjacent to the strongest magnetic body, a pattern typical of magnetite-destructive
alteration in copper-rich skarn assemblages. The magnetic anomaly in this context is interpreted
as a vector toward the mineralized system rather than a direct representation of the Cu-rich skarn
itself. This magnetic body is also coincident with a conductive body in the historical MT sections
and a resistivity anomaly at a similar depth, providing independent multi-dataset support for the
porphyry interpretation. The convergence of magnetic, MT, and resistivity evidence at this depth
supports the porphyry-skarn-CRD continuum model and will be discussed in full in a subsequent
release.
La Corona
The MVI model also resolves a third interpreted intrusive center: a broad magnetic body at depth
south of Cerro Grande Central, designated the La Corona target (Figure 4). La Corona is
identified from geophysical modelling at this stage and has not been drill-tested. At surface, the
La Corona area displays copper-anomalous soil samples across three lines at 100-metre spacing
and anomalous historic rock samples returning up to 2% Cu, described as skarn-type
occurrences. Together with Mezquital and the Cerro Grande Central deep source, La Corona
defines a multi-center intrusive framework across the Adelita district. The Company intends to
present a full district-scale interpretation of these three centers, including their relationship to a
broader porphyry-skarn-carbonate replacement deposit continuum model, in a subsequent
release. La Corona is associated with NW-SE structural lineaments consistent with the primary
Laramide magmatic-hydrothermal corridor that controls the Cerro Grande discovery.
Geophysical Survey Quality Control
The survey was conducted using SmartMag (5 Hz, Phase 1, March 2026) and MagArrow (1,000
Hz, Phase 2, May 2026) UAV-borne magnetometers on a DJI Matrice 400 platform at a nominal
height of approximately 20 metres above ground level. A GEM GSM-19 base station provided
continuous diurnal correction data throughout the survey. GPS positions were post-processed
using PPK correction, achieving a horizontal positioning accuracy of ≤0.05 metres. Processing
included diurnal correction, data cleaning, phase integration, levelling, and generation of
enhanced products including TMI, RTP, analytic signal, vertical and horizontal derivatives, tilt
derivative, standard deviation, and contact occurrence density.
Qualified Person
The scientific and technical information disclosed in this news release has been reviewed and
approved by João Rocha, EurGeol, Vice President of Exploration of Algo Grande Copper Corp.,
a Qualified Person as defined by National Instrument 43-101. The Qualified Person has reviewed
the survey design, data acquisition and processing methodology, and 3D inversion parameters
described herein, and considers the resulting geophysical model to be a reasonable and
geologically plausible representation of the subsurface magnetic sources at the Adelita Project.
Magnetic inversion results are inherently non-unique and have been interpreted in the context of
available geological mapping, structural analysis, and surface geochemistry.
About Algo Grande Copper Corp.
Algo Grande Copper Corp. is a growth-focused mineral exploration company advancing the
Adelita Project, a district-scale, multi-system copper-silver-gold opportunity positioned in the
prolific Arizona-Sonora copper belt.
Algo Grande is dedicated to unlocking the full mineral potential of this under-explored corridor
through disciplined data-driven exploration, technical excellence, and a firm commitment to
value creation for shareholders. The 5,895-hectare Adelita Project is anchored by the high-grade
Cerro Grande Cu-Ag-Au skarn discovery, which exhibits strong continuity along a defined
corridor extending over 6 kilometres. Reprocessing of legacy geophysical data and field mapping
indicate the presence of a potential porphyry system at depth, suggesting a classic skarn-
porphyry mineralization model similar to major deposits found throughout northwestern Mexico.
ON BEHALF OF ALGO GRANDE COPPER CORP.
Enrico Gay
Chief Executive Officer
For more information, please contact:
E-mail: [email protected]
Website: www.algo-grande.com
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