Mirasol Provides Exploration Update on Sobek Copper-Gold
NEWS RELEASE
Suite 1150 – 355 Burrard Street, Vancouver, B.C. Canada, V6C 2G8
Tel: +1 604 602 9989 E-mail: [email protected]
www.mirasolresources.com
April 23, 2026
Shares Issued and Outstanding: 88,597,189
TSX-V: MRZ
OTC: MRZLF
Mirasol Provides Exploration Update on Sobek Copper-Gold
Project in the Vicuña District, Chile
• Exploration season completed, including two drill holes , at the 46 South Target
located just 7 km west of Filo del Sol in the Vicuña District, at the south end of Sobek
Central
• Results from t he first drill hole testing the 46 South target confirm a structurally
controlled hydrothermal system with anomalous copper/gold geochemical intervals
• A second drill hole was completed 300 m to the south of the first hole to test directly
beneath the quartz-alunite breccia for stronger near surface mineralization; assays
are pending
VANCOUVER, BC, April 23, 2026 — Mirasol Resources Ltd. (TSX -V: MRZ) (OTC: MRZLF) (the “ Company” or
“Mirasol”) announces an update on the exploration and drilling at the Company’s 100%-owned Sobek Copper-
Gold-Silver Project (“Sobek” or “the Project ”) located 7 km west of Filo Del Sol in the Vicuña District of Chile .
Two drill holes were completed this season to test the 46 South target located on the south end of Sobek Central,
results from the second hole are still pending.
Figure 1: Vicuña District - Sobek Property Package including the 46 South Target
The first drill hole was designed to test the main structural corridor at 46 South target which resides on the
southern margin of a district-scale magnetic high where both the airborne MT and magnetics surveys outlined
distinct cylindrical anomalies. The ground based Deep Vectoring IP and MT geophysical survey launched late last
year also defined a corresponding shallow coincident IP anomaly with strong MT -resistivity and chargeability
responses. The grid-based soil survey over the area outlined a coincident, large and coherent copper-gold-moly
geochemical anomaly on surface that directly overlays IP -PDP resistivity and chargeability responses from IP
ground geophysics surveys (news release dated January 22, 2026).
The drilling confirmed that 46 South hosts a structurally controlled hydrothermal system intersecting multiple
hydrothermal breccia zones with the strongest hydrothermal response closely tied to structurally controlled
breccias and fault zones, as opposed to the hypothesized lithocap environment which was expected to host a
much broader distribution of alteration and mineralization.
“These first drill holes at 46 South have improved our understanding of the target. Although initial assay results
were modest, drilling has confirmed a structurally controlled hydrothermal system , with the strongest
mineralization associated with hydrothermal breccias and fault -controlled corridors. The second drill hole was
positioned to test directly below the outcropping expression of the quartz- alunite breccia to target more
significant near-surface mineralization, geochemical results are currently pe nding. These results will help us
Suite 1150 – 355 Burrard Street, Vancouver, B.C. Canada, V6C 2G8
Tel: +1 604 602 9989 E-mail: [email protected]
www.mirasolresources.com
refine our geological model and guide the next stage of targeting at Sobek, a highly prospective project located
within a world-class copper-gold district,” stated Mirasol’s President and CEO Tim Heenan.
“Grassroots exploration requires continuous evaluation of targets. When results do not meet expectations , we
pivot and redirect focus to higher-confidence opportunities. Through our project generator model , Mirasol
maintains a pipeline of compelling assets with improving political framework in Argentina and now Chile driving
increased interest from potential partners.”
Highlights from the First Drill Hole (S46-DDH-001) Testing the 46 South Target:
Hole DDH-001 was drilled in a SSW direction, to test the main 46 South structural corridor and to intersect the
projected NW-trending structures beneath the surface alteration footprint. The principal anomalous intervals
defined to date in DDH-001 include:
• 15.82 m from 147.18 m to 163.00 m averaging 158 ppm copper, 30 ppm moly, 0.03 g/t gold , 1.57 g/t
silver, 261 ppm zinc, and 81 ppm lead, including:
o 4.72 m from 147.18 m to 151.90 m averaging 252 ppm copper, 48 ppm moly, 0.03 g/t gold, 2.47
g/t silver, 398 ppm zinc, and 148 ppm lead
• 21.3 m from 204.0 m to 225.3 m averaging 112 ppm copper, 24 ppm moly, 0.04 g/t gold, 0.59 g/t silver,
93 ppm zinc, and 42 ppm lead
• 7.20 m from 566.75 m to 573.95 m averaging 720 ppm copper, 4 ppm moly, 0.01 g/t gold, 0.12 g/t silver,
121 ppm zinc, and 47 ppm lead
• A secondary anomalous interval exists between approximately 204 .0 m and 225.3 m, represented by
elevated gold and pathfinder values across several discrete samples rather than a single continuous
copper intercept.
Table 1: Sobek Central - 46 South Target - Select Composite Geochemical Intervals from Initial Drilling
These intervals are hosted within hydrothermal breccias and are associated with silicification, argillic alteration,
pyrite, sulphate -rich veining and pathfinder enrichment, particularly arsenic -antimony-lead-zinc-silver, with
subordinate Cu-Mo.
Assays from DDH-001 indicate that the strongest geochemical response is not a copper-dominant intercept, but
rather a pathfinder- rich hydrothermal signature characterized by arsenic-antimony-lead-zinc-silver with
subordinate copper-moly. No significant copper intercepts were returned above a 0.10% copper cut-off, and the
Company considers the results to be more indicative of a localized hydrothermal system rather than a broad
copper-gold mineralized center.
Figure 2: Sobek Central - 46 South Target - Initial Drill Results
Geologically, the best results in DDH -001 are associated with hydrothermal breccias and zones of enhanced
structural preparation. Alteration is dominated by silicification and argillic overprint, accompanied by sulphate
rich veining and alteration mineral assemblages (silica/argillic) consistent with a structurally controlled
hydrothermal system.
Mineralization is dominated by pyrite, with only minor localized chalcopyrite and molybdenite observed.
Together, these features support interpretation of 46 South as a hydrothermal system, with metal enrichment
focused along discrete structural corridors rather than throughout a large uniformly mineralized body.
Hole DDH-001 also intersected a moderate copper-bearing interval from 566.75 m to 573.95 m averaging 226.5
ppm copper, within the projected depth extension of the southern quartz-alunite breccia trend. While the hole
Suite 1150 – 355 Burrard Street, Vancouver, B.C. Canada, V6C 2G8
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did not intersect a quartz- alunite breccia at depth, this interval supports the interpretation that the southern
hydrothermal corridor continues downward in the projected trend of that surface breccia domain.
Hole DDH -001 test ed the projected continuation of the surface quartz- alunite breccia trend at depth. As
alteration and mineralization did not appear to be strengthening with depth, the decision was made to halt the
drilling at 600m.
Results from Second Drill Hole Pending
Following up on the encouraging mineralization encountered in the upper portions of h ole DDH-001, a second
hole was completed 300 m to the south . The second hole was testing for stronger near surface
mineralization, directly beneath the surface expression of the quartz-alunite breccia. Geological logging and field
observations from DDH-002 suggest the continuation of the structurally controlled hydrothermal system into the
southern part of the target area, where alteration appears more oxidized and argillic in character. Assay results
are currently pending and will be reported once received and evaluated.
High-Profile Vicuña Copper-Gold-Silver District
Mirasol staked the Sobek Project in 2016 based on prospective local geology and attractive structural
architecture prior to the 2021 discovery of the high -grade feeder zone at the Filo del Sol gold -copper deposit
and the 2023 discovery of Lunahuasi. The consolidated Sobek Project is located on the same regional N -S
trending structural corridor and just 7km to the west of the Filo del Sol deposit and 3 km to the southwest of
NGEx Mineral’s discovery at Lunahuasi.
Sobek is located within a prospective geological environment with a compelling north -northeast trending
mineralized structural corridor crosscut by a north-northwest trending deep-seated trans-cordilleran lineament.
This is a common structural configuration hosting numerous Andean metal deposits in both Chile and Argentina.
About Mirasol Resources Ltd
Mirasol is a strategically positioned exploration company with over 20 years of operating, permitting and
community relations experience in the mineral rich regions of Chile and Argentina. Mirasol is currently self-
funding exploration at the flagship Sobek Copper-Gold Project located in the Vicuña Copper-Gold-Silver District
of northeast Chile while continuing to advance a strong pipeline of highly prospective early and mid -stage
projects.
For further information, contact:
Tim Heenan, President & CEO
or
Troy Shultz, Vice President Investor Relations
Tel: +1 (604) 602-9989
Email: [email protected]
Website: www.mirasolresources.com
Qualified Person Statement: Mirasol’s disclosure of technical and scientific information in this press release has been
reviewed and approved by Tim Heenan (MAIG), the President for the Company, who serves as a Qualified Person under the
definition of National Instrument 43-101.
QAQC: Mirasol applies industry standard exploration sampling methodologies and techniques. All geochemical rock chip,
soil, and stream sediment samples are collected under the supervision of the company’s geologists in accordance with
industry practice. Geochemi cal assays are obtained and reported under a quality assurance and quality control (QA/QC)
program with insertions of controls (standards, blanks and duplicates) submitted to the laboratory. Samples were
dispatched to ALS Global - Geochemistry Analytical Lab, in Santiago, Chile, an ISO 9001:2015 accredited laboratory, which
is independent from the Company. Drill core samples were cut and prepared on site and transported to the reception
Suite 1150 – 355 Burrard Street, Vancouver, B.C. Canada, V6C 2G8
Tel: +1 604 602 9989 E-mail: [email protected]
www.mirasolresources.com
facility of ALS in Copiapo, all under direct supervision of Mirasol personnel Drill core samples (1.5-2.5kg) were prepared
with PREP31, and analyzed for Au with fire assay and Ag-Cu-Zn-Pb and Mo AA62 with multi-acid (4) digestion with Atomic
Absorption (HF-HNO3-HClO4 Digest, HCl leach) and multi-element (48) four acid ICP-MS (*ME-MS61m). Assay results from
drill core, rock chip, soil and stream sediment, channel, and trench, samples may be higher, lower or similar to results
obtained from surface samples due to surficial oxidation and enrichment processes or due to natural geological grade
variations in the primary mineralization.
Forward Looking Statements: The information in this news release contains forward looking statements that are subject
to a number of known and unknown risks, uncertainties and other factors that may cause actual results to differ materially
from those anticipated in our forward -looking statements. Factors that could cause such differences include: changes in
world commodity markets, equity markets, costs and supply of materials relevant to the mining industry, change in
government and changes to regulations affecting the mining indus try and to policies linked to pandemics, social and
environmental related matters. Forward-looking statements in this release include statements regarding future exploration
programs, operation plans, geological interpretations, mineral tenure issues and m ineral recovery processes. Although we
believe the expectations reflected in our forward -looking statements are reasonable, results may vary, and we cannot
guarantee future results, levels of activity, performance or achievements. Mirasol disclaims any obl igations to update or
revise any forward-looking statements whether as a result of new information, future events or otherwise, except as may
be required by applicable law.
Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX
Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.
Figure 1: Vicuña District - Sobek Property Package including the 46 South Target
Sobek
North
Sobek
Central
Lunahuasi
Filo Sur
Filo Del Sol
El Potro
Los Helados
Chile Argentina
VN-Zone
Rosita
46 South
7 km
Josemaria
Sobek
South
Mirasol
Sobek & Rosita
Properties
TSX-V: MRZ OTC: MRZLF
ARGENTINA
Sobek
Table 1: Sobek Central - 46 South - Select Composite Geochemical Intervals from Initial Drilling
TSX-V: MRZ OTC: MRZLF
Notes:
1. Reported interval length are down hole widths and not true widths
2. Composite intervals were manually selected based on geological and geochemical significance, and values
are length-weighted averages calculated as Σ (grade × sample length) / Σ sample length, without applying a
cut-off grade. Values reported below detection were treated as half the detection limit where applicable
3. Some figures may not sum exactly due to rounding
Hole Number From (m) To (m) Interval (m) Cu ppm Mo ppm Au g/t Ag g/t Zn ppm Pb ppm
S46-DDH-001 147.18 163.00 15.82 158 30 0.03 1.57 215 81
including 147.18 151.90 4.72 252 48 0.03 2.47 398 148
S46-DDH-001 204.00 225.30 21.30 112 24 0.04 0.59 93 42
S46-DDH-001 566.75 573.95 7.20 227 4 0.01 0.12 121 47
3
N
Magnetic Susceptibility
46 South
Target
Plan View: Magnetic Susceptibility Slice
Tourmaline Breccia
Quartz
-
Alunite
Breccia
0 500Meters
NE
S46
-
DDH
-
001
15-20
Vector IP-PDP
Chargeability
(mV/V)
Deep
Magnetic
High
SW
Quartz
-
Alunite Breccia
Southern NW Corridor
0 1000
Meters
NW Structural Corridor
Tourmaline Breccias
500 - 508
150 - 500
75 - 150
25 - 75
<25
Cu ppm
Rockchips
150 - 275
75 - 150
55 - 75
40 - 55
30 - 40
4 -30
Cu ppm
Soil
<4
599m EOH
Quartz
-
Alunite Breccia
North Domain
-
Magnetic High
South Domain
-
Geochemical
Vector
46 South
Target
Section View: Drill Holes + integrated MT Resistivity + Vector IP Chargeability
15.82m @ 158 ppm Cu
Including 1.00m @ 0.182 g/t Au
from 147.18-163m
S46
-
DDH
-
002
21.3m @ 112 ppm Cu
from 204-225.3m
7.2m @ 227 ppm Cu
from 566.75-573.95m
S46
-
DDH
-
002
(pending results)
S46
-
DDH
-
001
Figure 2: Sobek Central - 46 South Target - Initial Drill Hole Results
TSX-V: MRZ OTC: MRZLF