Luca Intersects 6.8 Metres of 5.5 g/t Gold Equivalent at Tahuehueto Mine – Further Expanding High-Grade Mineralization Proximal to Existing Workings
Luca Mining Corp.
Suite 410, 1111 Melville Street
Vancouver, BC, V6E 3V6, Canada
NEWS RELEASE
Luca Intersects 6.8 Metres of 5.5 g/t Gold Equivalent at Tahuehueto Mine – Further
Expanding High-Grade Mineralization Proximal to Existing Workings
Vancouver, British Columbia, May 5, 2026 - Luca Mining Corp. (“Luca” or the “Company”) (TSX-V: LUCA; OTCQX: LUCMF;
Frankfurt: Z68) reports new assay results from its ongoing 2026 drilling program at the Tahuehueto gold-silver mine in
Durango, Mexico.
Exploration drilling has continued to intersect high-grade gold mineralization in newly identified breccia zones, close to
current mine workings, confirming continuity of breccia-hosted mineralization within the Creston vein system and
confirming potential for near-mine resource expansion. It is anticipated that portions of these newly identified mineralized
breccia zones can be readily included in resource models at the mine and be brought into production within one year.
Additionally, drill testing of the El Rey vein, which has not been mined since 1983 and has not been explored in any capacity
for over 20 years, identified mineralized breccia zones – elevating the priority of the El Rey target and underscoring the
mineral endowment of the Tahuehueto land package.
Two contracted diamond drill rigs are currently operating on site, with one dedicated to underground drilling and one to
surface drilling. A Luca-owned and operated underground drill rig has also been added as the exploration campaign continues
to grow. This expanded drill program reflects the Company’s increased 2026 exploration budget at Tahuehueto, with an
additional $2.4 million planned to be invested over the balance of the year.
Highlights
● High-grade intercepts from surface drill holes targeting the Creston Vein, including:
6.8 metres (“m”) of 5.54 g/t AuEq** (4.08 g/t Au, 58.79 g/t Ag, 0.71% Cu, 0.74% Pb, 1.19% Zn) in hole DDH26-
SU-07 including 1.0 m of 22.35 g/t AuEq (20.20 g/t Au, 72.70 g/t Ag, 1.13% Cu, 0.78% Pb, 2.65% Zn)
4.5 m of 4.50 g/t AuEq (2.23 g/t Au, 60.00 g/t Ag, 0.87% Cu, 2.16% Pb and 4.68% Zn) in hole DDH26-SU-04
including 2.6 m of 5.59 g/t AuEq (2.19 g/t Au, 89.88 g/t Ag, 1.35% Cu, 3.26% Pb and 6.72% Zn)
2.5 m of 3.57g/t AuEq (2.46 g/t Au, 32.34 g/t Ag, 0.32% Cu, 1.15% Pb and 2.60% Zn) in hole DDH26-SU-10,
including 1.3 m @ 4.94 g/t AuEq (4.02 g/t Au, 22.70 g/t Ag, 0.30% Cu, 1.11% Pb and 2.14% Zn)
● Demonstrated continuity of mineralization confirmed in unmined areas from 10 to 70 m below Level 23, extending
known high-grade breccia zones
● These intercepts exceed current mined grades and occur within development distance of existing underground
infrastructure and are planned to be developed in the medium term
● Verified and expanded brecciated vein-related mineralization at the El Rey target:
3.3 m of 3.04 g/t AuEq (0.59 g/t Au, 88.54 g/t Ag, 0.12% Cu, 4.84% Pb and 5.60 % Zn) in hole DDH26-239,
including 1.0 m @ 7.48 g/t AuEq (0.71 g/t Au, 207.00 g/t Ag, 0.33% Cu, 14.09% Pb, 17.79% Zn)
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● Results continue to validate the geologic model and highlight the expansion potential of these pervasive and
consistent mineralized structures
● Two contracted diamond drill rigs are currently on site, one dedicated to underground drilling and one to surface
drilling. A Luca owned and operated underground rig was added to the project this season as the exploration
campaign grows
“This latest round of surface drilling further confirms that high-grade breccia zones within the Creston Vein system remain
unmined below current workings, and are expected to be included into near- and medium-term mine plans at Tahuehueto,”
said Paul D. Gray, VP Exploration. “Additionally, the EL Rey vein, an area not mined nor drill tested in over 20 years, was
successfully intersected in every underground drillhole. This highlights the wealth of under-evaluated targets with potential
unmined strike extensions which the Company is systematically testing to support the addition of new mineral resources into
the near, medium and long term Tahuehueto mine plan.”
Drill Results Summary
Drillholes DDH26-SU-04 through DDH26-SU-013 targeted a previously untested zone approximately 30-40 metres below
active mine workings on Level 23 and along strike from Luca’s successful Phase 1 2024-2025 underground drill program (See
Company News Releases Dated February 20, 2025 and March 5, 2026).
All drillholes (with the exception of DDH26-SU-09 and DDH26-SU-13) intersected the Creston or El Rey vein structures in
well-developed brecciated veins and confirm strike continuity of the high-grade breccia zone identified in prior drilling, on
strike and down plunge.
To date, Luca has completed 40 underground holes for 8,268 m and 25 surface holes for 4,599 m using “HQ”, “NQ” and/or
“BQ” sized diamond drill core (Creston, Perdido, El Rey and Santiago targets).
Key Intercepts
Creston Vein:
DDH26-SU-04
● 4.5 m @ 4.50 g/t AuEq (2.23 g/t Au, 60.00 g/t Ag, 0.87% Cu, 2.16% Pb and 4.68% Zn) from 61.5 m
including 2.6 m @ 5.59 g/t AuEq (2.19 g/t Au, 89.88 g/t Ag, 1.35% Cu, 3.26% Pb and 6.72% Zn) from 61.5 m
DDH26-SU-05
Multiple mineralized veins, including:
1.5 m @ 10.03 g/t AuEq (9.86 g/t Au, 7.83 g/t Ag, 0.03% Cu, 0.14% Pb and 0.32% Zn) from 40.1 m
2.7 m @ 3.23 g/t AuEq (0.72 g/t Au, 80.42 g/t Ag, 1.42% Cu, 1.60% Pb, 2.13% Zn) from 69.2 m
DDH26-SU-06
Multiple mineralized veins, including:
● 5.3 m @ 2.97 g/t AuEq (1.62 g/t Au, 41.54 g/t Ag, 0.47% Cu, 1.37% Pb and 2.49% Zn) from 78.8 m:
including 3.1 m @ 4.35 g/t AuEq (2.36 g/t Au, 62.23 g/t Ag, 0.71% Cu, 1.97% Pb and 3.61% Zn) from 81.0 m
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2.9 m @ 3.70g/t AuEq (1.39 g/t Au, 130.02 g/t Ag, 0.70% Cu, 1.95% Pb and 0.76% Zn) from 110.8 m
DDH26-SU-07
Multiple mineralized veins, including:
1.0 m @ 14.61 g/t AuEq (14.30 g/t Au, 10.60 g/t Ag, 0.04% Cu, 0.27% Pb and 0.91% Zn) from 46.5 m
6.8 m @ 5.54 g/t AuEq (4.08 g/t Au, 58.79 g/t Ag, 0.71% Cu, 0.74% Pb, 1.19% Zn) from 71.5 m
including 1.0 m @ 22.35 g/t AuEq (20.20 g/t Au, 72.70 g/t Ag, 1.13% Cu, 0.78% Pb and 2.65% Zn) from
75.4 m
DDH26-SU-08
1.0 m @ 2.31 g/t AuEq (0.63 g/t Au, 92.90 g/t Ag, 0.82% Cu, 0.11% Pb and 0.09% Zn) from 186.3 m
DDH26-SU-10
Multiple mineralized veins, including:
2.5 m @ 3.57g/t AuEq (2.46 g/t Au, 32.34 g/t Ag, 0.32% Cu, 1.15% Pb and 2.60% Zn) from 152.5 m, including 1.3
m @ 4.94 g/t AuEq (4.02 g/t Au, 22.70 g/t Ag, 0.30% Cu, 1.11% Pb and 2.14% Zn) from 153.8 m
● 1.0 m @ 11.54 g/t AuEq (7.73 g/t Au, 277.00 g/t Ag, 0.28% Cu, 4.04% Pb and 0.70% Zn) from 169.6 m
● 0.8 m @ 4.36 g/t AuEq (4.27 g/t Au, 5.50 g/t Ag, 0.03% Cu, 0.02% Pb and 0.04% Zn) from 174.9 m
DDH26-SU-11
6.8 m @ 3.29 g/t AuEq (2.91 g/t Au, 19.38 g/t Ag, 0.11% Cu, 0.15% Pb and 0.51% Zn) from 127.1 m, Including
3.1 m @ 5.86 g/t AuEq (5.19 g/t Au, 36.54 g/t Ag, 0.18% Cu, 0.24% Pb, 0.76% Zn) from 127.6 m
Production Verification Drillholes
As part of the Tahuehueto exploration program a Luca owned and operated Termite drill rig capable of drilling “BQ” sized
drill core up to 100 m in length has been added to bolster near underground workings verification and mineral definition.
Drill core from this drill rig are handled by the Tahuehueto exploration department and treated the same as exploration drill
core (processing, logging and sampling) and is now being utilized to more accurately define the mineralized zones
anticipated to be part of the near-term mine plan objectives. This set of Termite drillholes were drilled from Level 23 of the
Tahuehueto mine and targeted areas that are scheduled to be mined during H2 2026.
TRT25-02
Multiple mineralized veins, including:
● 7.5 m @ 3.47 g/t AuEq (2.33 g/t Au, 35.81 g/t Ag, 0.25% Cu, 1.37% Pb and 2.78% Zn) from 23.0, including 3.9 m @
5.33 g/t AuEq (3.76 g/t Au, 52.51 g/t Ag, 0.34% Cu, 1.97% Pb and 3.39% Zn) from 25.0 m, which includes 1.5 m of
6.81 g/t AuEq (5.83 g/t Au, 24.93 g/t Ag, 0.27% Cu, 0.69% Pb, 3.05% Zn) from 26.0
● 2.2 m @ 5.32 g/t AuEq (2.42 g/t Au, 152.46 g/t Ag, 1.52% Cu, 0.19% Pb and 0.13% Zn) from 34.3 m
TRT26-03
0.9 m of 11.49 g/t AuEq (5.22 g/t Au, 389.00 g/t Ag, 2.50% Cu, 0.16% Pb and 0.65% Zn) from 33.3 m
TRT26-05
Multiple mineralized veins, including:
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● 3.0 m @ 3.47 g/t AuEq (1.36 g/t Au, 31.22 g/t Ag, 0.24% Cu, 5.23% Pb and 6.56% Zn) from 18.2 m
● 3.2 m @ 7.23 g/t AuEq (4.97 g/t Au, 75.65 g/t Ag, 0.46% Cu, 2.71% Pb and 5.27% Zn) from 38.4 m, Including 2.0 m
@ 10.77 g/t AuEq (7.39 g/t Au, 109.59 g/t Ag, 0.67% Cu, 4.19% Pb and 8.15% Zn) from 38.4 m
EL Rey Vein:
DDH26-239
3.3 m @ 3.04 g/t AuEq (0.59 g/t Au, 88.54 g/t Ag, 0.12% Cu, 4.84% Pb and 5.60 % Zn) from 312.8 m, including
1.0 m @ 7.48 g/t AuEq (0.71 g/t Au, 207.00 g/t Ag, 0.33% Cu, 14.09% Pb, 17.79% Zn) from 313.8 m
True widths are estimated to be approximately 85-90% of drilled intervals.
Figures 1-9 present the location of the drillholes with assay results and Tables 1 and 2 provide summary analytical results
and drill collar details, respectively.
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About 2026 Tahuehueto Exploration Program
The Tahuehueto property comprises a large epithermal gold-silver vein system with approximately 11 kilometres of known
vein strike length and numerous mineralized structures. Mineralization remains open along strike and at depth across most
modeled Mineral Resource areas. The current campaigns represent the first substantive exploration drilling conducted on