Luca Mining Intersects 14 metres of 7 g/t Gold at Tahuehueto Mine, Durango, Mexico
Luca Mining Corp.
` Suite 410, 1111 Melville Street
Vancouver, BC, V6E 3V6, Canada
News Release
Luca Mining Intersects 14 metres of 7 g/t Gold at
Tahuehueto Mine, Durango, Mexico
Vancouver, British Columbia, September 8, 2025 – Luca Mining Corp. (“Luca” or the
“Company”) (TSX-V: LUCA; OTCQX: LUCMF; Frankfurt: Z68) is pleased to report new high-
grade results from its ongoing Phase 2, 5,000 metre underground drill program and the first
surface drilling at the Santiago Deposit of the Tahuehueto Gold-Silver Mine in Durango,
Mexico.
Highlights include:
Santiago Deposit: 14.0 m grading 6.68 g/t gold and 6.0 m grading 9.0 g/t gold, the
first drilling at Santiago since 2008.
High-grade intercepts up to 23.1 g/t AuEq over 1.9 m within a broader 5.8 m zone
grading 9.0 g/t AuEq.
Underground drilling continues to hit the Creston and Perdido veins in every hole,
confirming continuity and expansion potential.
New breccia-style zones returned 27.1 g/t AuEq over 0.4 m and 13.1 g/t AuEq over
1.2 m north of current workings.
Santiago Deposit: Strong Start to Surface Drilling
The first two holes at Santiago have exceeded expectations, returning higher grades than
those in the current resource model. Located one kilometre from current mine workings,
Santiago has never been mined and is open along strike. Six holes have now been completed
(1,656 m of a 2,500 m program).
“The Santiago Deposit is a gold-rich part of the Tahuehueto system that has never been mined,”
stated Paul D. Gray, VP Exploration. “These are the first drill results from Santiago in more than
16 years, and they clearly demonstrate the potential for new, high-grade resources. Importantly,
Santiago trends onto ground we recently acquired, giving us immediate upside in untested
areas.”
Underground Drilling: Consistent Vein Continuity
All 27 underground holes drilled to date (6,200 m) have intersected the Creston and Perdido
veins, extending known mineralization north of existing workings. Several new breccia zones
were discovered, confirming strong continuity of these productive structures and supporting
near-mine resource growth.
Next Steps
Both surface and underground drilling are advancing. At Santiago, step-out drilling is
targeting strike extensions to the east and west. Underground, Phase 2 drilling continues to
focus on adding mineable resources into the near- and medium-term mine plan.
Figures 1 and 2 show drillhole locations; Tables 1 and 2 provide assay highlights and collar
details.
Figure 1
Figure 2
Table 1: Highlighted Diamond Drill Assay Results from DDH24-225 through DDH25-235 and
DDH-25-SGO-001 and DDH-25-SGO-002
Hole From (m) To (m) Interval* (m) Au (g/t) Ag (g/t) Cu (%) Pb (%) Zn (%) Au Eq** Drilled vein
DDH25-225
37.0 37.5 0.5 0.14 86.80 0.87 2.45 1.17 3.40 Creston Hanging-wall
165.9 166.7 0.8 3.38 15.90 0.08 0.48 0.88 4.11 Main Creston
174.5 177.6 3.1 0.23 93.34 0.40 1.14 0.81 2.49 Main Creston
DDH25-227
35.9 38.8 3.0 0.34 52.88 0.04 3.27 2.19 2.68 Creston Hanging-wall
Including
36.5 38.2 1.7 0.38 24.13 0.04 5.43 3.16 3.28 Creston Hanging-wall
146.8 148.0 1.2 2.43 200.00 1.48 0.33 0.25 6.99 Main Creston
DDH25-228
40.0 46.9 7.0 0.31 19.63 0.06 0.86 5.00 2.55 Creston Hanging-wall
Including
45.8 46.9 1.2 1.66 93.30 0.27 4.45 25.91 13.09 Creston Hanging-wall
DDH25-229
95.4 95.8 0.4 0.64 22.90 0.15 2.23 9.01 4.75 Creston
146.9 148.5 1.7 0.33 49.28 0.27 1.64 4.60 3.28 Main Creston
167.4 169.7 2.3 0.40 123.07 1.10 0.50 0.77 3.73 Main Creston
DDH25-231
113.5 114.9 1.4 0.31 27.40 0.19 2.00 4.23 2.86 Creston
119.3 122.9 3.6 0.64 39.09 0.34 0.67 2.06 2.44 Creston
Including
121.1 122.9 1.9 1.07 52.51 0.38 0.95 2.78 3.40 Creston
191.1 191.7 0.6 1.29 35.00 0.06 0.50 1.80 2.54 Main Creston
DDH25-232
74.6 75.3 0.7 0.06 3.85 0.03 0.59 7.07 2.68 Creston Hanging-wall
168.2 168.7 0.5 1.07 14.81 0.17 0.17 5.28 3.29 Main Creston
224.5 225.4 0.9 1.38 41.65 0.15 0.17 0.29 2.23 Creston Foot-wall
DDH25-233 126.1 127.7 1.6 5.38 171.04 0.33 0.54 4.20 9.49 Creston
DDH25-234
151.1 151.5 0.4 20.30 200.00 0.26 1.18 10.98 27.13 Creston
173.8 176.8 3.0 1.42 163.03 1.29 1.66 3.66 6.78 Main Creston
Including
176.0 176.8 0.8 2.69 200.00 2.44 6.18 13.19 14.43 Main Creston
211.8 213.4 1.7 1.35 106.41 0.75 0.16 1.98 4.34 Creston Foot-wall
231.4 232.4 1.0 0.27 15.40 0.11 0.97 4.67 2.43 Creston Foot-wall
DDH25-
SGO-01
237.1 242.8 5.8 8.22 26.89 0.06 0.38 0.75 9.00 Santiago
Including
237.1 240.6 3.6 12.75 39.06 0.08 0.21 0.65 13.61 Santiago
Including
237.1 239.0 1.9 22.28 38.85 0.05 0.22 0.65 23.10 Santiago
DDH25-
SGO-02
185.9 207.2 21.3 4.96 55.99 0.33 0.44 0.61 6.41 Santiago
Including
185.9 187.9 2.0 5.30 12.20 0.01 0.05 0.14 5.53 Santiago
And
193.2 207.2 14.0 6.68 76.50 0.40 0.63 0.82 8.59 Santiago
Including
194.0 197.0 3.0 17.11 132.34 0.44 1.67 2.64 20.67 Santiago
And
201.4 207.2 5.8 6.73 78.29 0.17 0.38 0.20 8.09 Santiago
Including
204.8 207.2 2.4 11.68 127.84 0.16 0.36 0.16 13.63 Santiago
*True widths are estimated to be approximately 85% of drilled intervals.
** AuEq equation is: AuEq = Au + (Ag*0.0124) + (Cu%*1.2799) + (Pb%*0.2737) + (Zn%*0.3359), at $2,250 US$/oz
Au, 28 US$/oz Ag, 9,260 US$/Tonne Cu, 1,980 US$/Tonne Pb and 2,430 US$/Tonne Zn, respectively.
Table 2: Drill Collar Locations and Details for Released Results
Hole ID WGS84 Z14
Easting
WGS84 Z14
Northing Elevation (m) Azimuth Dip (°) Total Depth (m)
DDH25-225 337805 2813100 1,513 340 25 260
DDH25-226 337805 2813100 1,513 340 5 228
DDH25-227 337805 2813100 1,513 340 -13 174
DDH25-228 337805 2813100 1,513 340 -35 165
DDH25-229 337805 2813100 1,513 340 -55 189
DDH25-230 337809 2813095 1,513 092 30 177
DDH25-231 337804 2813099 1,513 298 -15 246
DDH25-232 337804 2813099 1,513 298 24 264
DDH25-233 337804 2813099 1,513 298 -41 291
DDH25-234 337804 2813099 1,513 298 -58 267
DDH25-235 337804 2813099 1,513 323 1 210
DDH-25-SGO-01 338577 2813434 1872.79 24 -48 291
DDH-25-SGO-02 338577 2813434 1872.79 345 -60 231
About 2025 Tahuehueto Exploration Program
The Tahuehueto property comprises a large, epithermal gold-silver vein system comprising
11 kilometres of strike length of known veins and other mineralized structures. These drill
campaigns represent the first substantive exploration drilling on the Property in over 12
years. Mineralization remains open along strike and at depth for most of the modeled Mineral
Resource areas. The objective of the current campaigns will be a combination of in-fill and
step-out drilling to demonstrate the vertical and horizontal extent of mineralization as well
as to target thick, high-grade mineralized breccia zones known to exist within the epithermal
vein system. Recent mining in Level 23 encountered higher grade mineralization averaging
3.30 g/t Au over vein widths up to 20 metres, with values up to 65.04 g/t Au, in breccia zones
branching off the main Creston vein (refer to News Release dated May 29, 2024).
In addition to the four veins that comprise the Mineral Resource, there are at least 14
additional prospective veins documented within the concession area that have potential to
host additional epithermal Au-Ag(-Cu-Zn-Pb) mineralization. In some cases, these
prospective targets may represent extensions of the currently defined Mineral Resource. The
Company estimates that there are more than 11 km of prospective vein structures (measured
along strike), compared to the 4.5 km of mineralized veins that support the current Mineral
Resource model.
Figure 3 below shows the relative location of prospective veins (yellow) and veins modeled
for Mineral Resources (red) within the Company's concession area.
Figure 3
About Luca Mining Corp.
Luca Mining (TSX-V: LUCA, OTCQX: LUCMF, Frankfurt: Z68) is a diversified Canadian mining
company with two 100%-owned producing mines within the prolific Sierra Madre
mineralized belt in Mexico which hosts numerous producing and historical mines along its
trend. The Company produces gold, copper, zinc, silver and lead from these mines that each
have considerable development and resource upside.
The Campo Morado polymetallic VMS mine is an underground operation located in Guerrero
State. It produces copper-zinc-lead concentrates with precious metals credits. It is currently
undergoing an optimization program which is already generating significant improvements
in recoveries, grades, efficiencies, and cashflows.
The Tahuehueto Mine is a large property of over 75 square kilometres in Durango State.
The project hosts epithermal gold and silver vein-style mineralization. Tahuehueto is a
newly constructed underground mining operation producing primarily gold and silver. The
Company has successfully commissioned its mill and is now in commercial production.
Analytical Method and Quality Assurance/Quality Control Measures
All drill core splits reported in this news release were analysed by Bureau Veritas of Durango,
Mexico, utilizing the Multi-Acid digestion ICP-ES 35-element MA300 analytical package with
FA-430 30-gram Fire Assay with AAS finish for gold on all samples. Au over-limits from FA-
430 are re-analyzed by FA530 30-gram Fire Assay with Gravimetric finish. Ag over-limits
from ICP MA300 analytical package are re-analyzed by FA530 30-gram Fire Assay with
Gravimetric finish. Similarly, Cu, Pb and Zn over-limits from ICP MA300 analytical package
are re-analyzed by ICP Multi-Acid digestion MA370 package. All core samples were split by
core saw on-site at Luca’s core processing facilities at the Tahuehueto Mine. Once split, half
samples were placed back in the core boxes with the other half of split samples sealed in poly
bags with one part of a three-part sample tag inserted within. Samples were collected by
Bureau Veritas at the Tahuehueto Mine site and transported to Bureau Veritas’ Durango
Laboratory, where samples are prepared to a 250 gram pulp and analyzed for Gold by Fire
assay with pulps shipped to Bureau Veritas’s Analytical laboratory in Vancouver, B.C., for final
ICP chemical analysis. A robust system of standards, 1/4 core duplicates and blanks was
implemented in the 2024-2025 exploration drilling program and is monitored as chemical
assay data become.
Qualified Person
The technical information contained in this news release has been reviewed and approved
by Mr. Paul D. Gray, P.Geo., Vice President Exploration at Luca Mining. Mr. Gray is a Qualified
Person for the Company as defined by National Instrument 43-101.
On Behalf of the Board of Directors
(signed) “Dan Barnholden”
Dan Barnholden, Chief Executive Officer
Contact Information:
Sophia Shane
Director of Corporate Development
+1 604 306 6867
For more information, please visit: www.lucamining.com
Cautionary Note Regarding Forward-Looking Statements
It should be noted that Luca declared commercial production at Campo Morado prior to
completing a feasibility study of mineral reserves demonstrating economic and technical
viability. Accordingly, readers should be cautioned that Luca’s production decision has been
made without a comprehensive feasibility study of established reserves such that there is
greater risk and uncertainty as to future economic results from the Campo Morado mine and
a higher technical risk of failure than would be the case if a feasibility study were completed
and relied upon to make a production decision. Luca has completed a preliminary economic
assessment (“PEA”) mining study on the Campo Morado mine that provides a conceptual life
of mine plan and a preliminary economic analysis based on the previously identified mineral
resources (see news releases dated November 8, 2017, and April 4, 2018).
Statements contained in this news release that are not historical facts are “forward-looking
information” or “forward-looking statements” (collectively, “Forward-Looking Information”)
within the meaning of applicable Canadian securities laws. Forward Looking Information
includes, but is not limited to, disclosure regarding the Financings, the anticipated timing of
closing thereof and the expected use of proceeds therefrom; and other possible events,
conditions or financial performance that are based on assumptions about future economic
conditions and courses of action; the timing and costs of future activities on the Company’s
properties, such as production rates and increases; success of exploration, development and
bulk sample processing activities, and timing for processing at its own mineral processing
facility on the Tahuehueto project site. In certain cases, Forward-Looking Information can be
identified using words and phrases such as “plans,” “expects,” “scheduled,” “estimates,”
“forecasts,” “intends,” “anticipates” or variations of such words and phrases. In preparing the
Forward-Looking Information in this news release, the Company has applied several material
assumptions, including, but not limited to, that all requisite approvals in respect of the
Financings will be received, and all conditions precedent to completion of the Financings will
be satisfied, in a timely manner; the Company will be able to raise additional capital as
necessary; the current exploration, development, environmental and other objectives
concerning the Campo Morado Mine and the Tahuehueto Project can be achieved; the
program to improve mining operations at Campo Morado will proceed as planned; the
continuity of the price of gold and other metals, economic and political conditions, and
operations. Forward-Looking Information involves known and unknown risks, uncertainties
and other factors which may cause the actual results, performance, or achievements of the
Company to be materially different from any future results, performance or achievements
expressed or implied by the Forward-Looking Information. There can be no assurance that
Forward-Looking Information will prove to be accurate, as actual results and future events
could differ materially from those anticipated in such statements. Accordingly, readers
should not place undue reliance on Forward-Looking Information. Except as required by law,
the Company does not assume any obligation to release publicly any revisions to Forward-
Looking Information contained in this news release to reflect events or circumstances after
the date hereof or to reflect the occurrence of unanticipated events.
Neither 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.