Luca Intersects 19 Metres of 6.3 g/t Gold Equivalent from the Creston Vein at Tahuehueto Mine

Luca Mining reports high-grade drill results at Tahuehueto, targeting 2027 production.

What the company is saying

Luca Mining Corp. (TSXV:LUCA, OTCQX:LUCMF, FRANKFURT:Z68) is highlighting new high-grade assay results from its 2026 exploration drilling at the Tahuehueto gold-silver mine in Mexico. The company frames the Creston Vein intersection of 18.7 metres at 6.28 g/t AuEq as exceeding previous expectations for both width and grade, emphasizing its proximity to existing underground infrastructure and its inclusion in areas scheduled for mining in the first half of 2027. Additional results from the Catorce and Santiago veins are presented as evidence of near-mine resource expansion potential. The tone is confident, with Vice President Exploration Paul D. Gray stating that these results support the view of continuous mineralization and significant exploration upside. The announcement stresses the scale of the drill campaign—67 underground holes (11,450 m) and 38 surface holes (7,236 m)—and the presence of more than 11 km of prospective vein structures, compared to 4.5 km currently in the resource model. The company also details the use of updated metallurgical recoveries and metal prices in its AuEq calculations, underlining technical rigor.

What the data suggests

The disclosed assay results are robust, with the Creston Vein yielding 18.7 metres of 6.28 g/t AuEq, including sub-intervals of 7.8 metres at 7.14 g/t AuEq and 7.1 metres at 8.55 g/t AuEq. Catorce Block drilling returned 13.7 metres at 3.33 g/t AuEq and 3.6 metres at 6.67 g/t AuEq, while Santiago produced 11.6 metres at 5.21 g/t AuEq. These grades are well above typical economic cutoffs for underground gold-silver operations. The company has completed 1,532 metres of drilling at Catorce, 11,450 metres underground, and 7,236 metres from surface at Tahuehueto, indicating a substantial exploration effort. Metallurgical recoveries used in AuEq calculations are Au 84%, Ag 85%, Cu 78.3%, Pb 71.6%, and Zn 48%, with metal prices of $3,800/oz Au, $40/oz Ag, $10,582/t Cu, $1,896/t Pb, and $2,930/t Zn. Drill collar elevations and locations are disclosed in detail. The mineralized system remains open along strike and at depth, with only 4.5 km of the 11 km vein system currently in the resource model. No resource update or economic study is included, so the results represent geological potential rather than confirmed mineable inventory.

Analysis

The announcement provides detailed and credible assay results from the 2026 exploration drill program at Tahuehueto, with specific grades, widths, and drillhole data. These realised facts are robust and well-supported. However, the tone is somewhat inflated by forward-looking statements about future mining (scheduled for 2027), resource expansion, and 'significant exploration upside,' none of which are yet realised or quantified in terms of resource/reserve upgrades or economic studies. The majority of key claims are forward-looking, including the potential for near-term mine planning and production, but these are not yet supported by feasibility or development milestones. There is no disclosure of capital outlay, project economics, or profitability metrics, but as this is an exploration-stage update, such omissions are normal and not a deficiency. The gap between narrative and evidence lies in the extrapolation from promising drill results to future production and resource growth, which remains unproven at this stage.

Risk flags

• ●Resource conversion risk is significant, as high-grade drill results do not guarantee that these intervals will translate into compliant resources or reserves. The absence of a new resource estimate or economic study means the impact on mineable inventory is unquantified.
• ●Execution risk is present in bringing the newly identified zones into production by H1 2027. This requires timely completion of definition drilling, resource modeling, permitting, and mine development, any of which could face delays or technical challenges.
• ●Exploration risk persists, as the broader system is described as underexplored and open along strike and at depth. Future drilling may not replicate current grades or widths, potentially limiting the scale of resource expansion.
• ●Disclosure risk exists due to the lack of financial data, cost estimates, or project economics in the announcement. Investors have no visibility on capital requirements, operating costs, or projected returns for the new zones.
• ●Commodity price risk is relevant, as AuEq calculations are based on specific metal prices ($3,800/oz Au, $40/oz Ag, $10,582/t Cu, $1,896/t Pb, $2,930/t Zn). Any significant price movement could impact the economic viability of the project.

Bottom line

Luca Mining's latest drill results at Tahuehueto demonstrate high-grade, wide intersections near existing infrastructure, with plans to bring these zones into production in 2027. The geological data is detailed and credible, with strong grades and substantial drilling completed, but the announcement stops short of providing a resource update or economic analysis. The narrative is optimistic about resource expansion and near-term mine planning, but realization depends on successful resource conversion and execution of mine development steps. Key risks include the translation of drill results into reserves, execution of the 2027 mining plan, and the absence of cost or economic data. Investors should watch for future resource estimates, mine planning milestones, and any disclosure of project economics to assess the true impact of these results. The most important takeaway is that while the drill results are promising, their value will only be confirmed through subsequent resource and development milestones.

Announcement summary

(TSXV:LUCA) (OTCQX:LUCMF) (FRANKFURT:Z68) Luca Mining Corp. has reported new assay results from its 2026 exploration drill program at the Tahuehueto gold-silver mine in Durango, Mexico. The Creston Vein yielded a significant intersection of 18.7 metres grading 6.28 g/t gold equivalent (AuEq), including sub-intervals of 7.8 metres at 7.14 g/t AuEq and 7.1 metres at 8.55 g/t AuEq. These intersections are located near existing underground infrastructure and are scheduled for mining in the first half of 2027. At the Catorce Block, drilling returned 13.7 metres of 3.33 g/t AuEq and 3.6 metres of 6.67 g/t AuEq, with a notable sub-interval of 0.7 metres at 8.57 g/t AuEq. The Santiago vein produced 11.6 metres of 5.21 g/t AuEq, including 1.2 metres at 9.90 g/t AuEq. Luca has completed seven diamond drillholes totaling 1,532 metres at Catorce as part of its renewed exploration program. To date, the company has drilled 67 underground holes totaling 11,450 metres and 38 surface holes totaling 7,236 metres at Tahuehueto. Drillhole TRT26-15 at Creston Vein returned 18.7 metres of 6.28 g/t AuEq (2.65 g/t Au, 75.08 g/t Ag, 0.86% Cu, 4.61% Pb, 11.16% Zn) from 30.4 metres, including 7.8 metres of 7.14 g/t AuEq and 7.1 metres of 8.55 g/t AuEq. Drillhole TRT26-14 intersected 1.9 metres of 5.02 g/t AuEq (4.38 g/t Au, 24.72 g/t Ag, 0.24% Cu, 0.59% Pb, 0.79% Zn) from 52.4 metres. At Catorce, DDH26-RCE-05 returned 13.7 metres of 3.33 g/t AuEq, including 0.7 metres of 8.57 g/t AuEq and 2.0 metres of 4.99 g/t AuEq. DDH26-RCE-02 intersected 3.6 metres of 6.67 g/t AuEq, including 0.7 metres of 14.86 g/t AuEq. At Santiago, DDH26-SGO-12 returned 11.6 metres of 5.21 g/t AuEq, including 1.2 metres of 9.90 g/t AuEq. The Tahuehueto property hosts approximately 11 kilometres of known vein strike length, with mineralization open along strike and at depth. The 2026 exploration program is the first substantive drilling in over 12 years and aims to expand known resources and define additional high-grade zones. Metallurgical recoveries used in AuEq calculations are Au 84%, Ag 85%, Cu 78.3%, Pb 71.6%, and Zn 48%, with metal prices of $3,800 US$/oz Au, 40 US$/oz Ag, 10,582 US$/Tonne Cu, 1,896 US$/Tonne Pb, and 2,930 US$/Tonne Zn. Drill collar elevations include 1,509.80 m, 1,512.53 m, 1,512.58 m, 1,212.74 m, 1,813.53 m, 1,813.52 m, 1,318.00 m, and 1,318.40 m. The company has identified more than 11 km of prospective vein structures, compared to 4.5 km currently in the resource model, indicating significant exploration upside.

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