Luca Mining Intersects 14 metres of 7 g/t Gold at Tahuehueto Mine, Durango, Mexico

Executive Summary

• Luca Mining reported high‑grade drill intercepts from the first surface drilling at the Santiago Deposit, including a 14.0 m interval grading 6.68 g/t Au and a 23.1 g/t AuEq over 1.9 m within a broader 5.8 m zone of 9.0 g/t AuEq.
• Underground Phase‑2 drilling continues to intersect the Creston and Perdido veins in all 27 holes (6,200 m total), adding new breccia zones with up to 27.1 g/t AuEq over 0.4 m.
• The results expand known mineralization, support near‑mine resource growth, and justify continued step‑out drilling at Santiago and ongoing underground expansion.

Key Details

• Santiago Deposit – Surface Drilling
• Hole DDH‑25‑SGO‑01: 5.8 m @ 8.22 g/t Au, 26.89 g/t Ag (AuEq 9.00 g/t).
• Same hole (sub‑intervals): 3.6 m @ 12.75 g/t Au, 39.06 g/t Ag (AuEq 13.61 g/t); 1.9 m @ 22.28 g/t Au, 38.85 g/t Ag (AuEq 23.10 g/t).
• Hole DDH‑25‑SGO‑02: 21.3 m @ 4.96 g/t Au, 55.99 g/t Ag (AuEq 6.41 g/t); notable sub‑intervals include 14.0 m @ 6.68 g/t Au, 76.50 g/t Ag (AuEq 8.59 g/t) and 3.0 m @ 17.11 g/t Au, 132.34 g/t Ag (AuEq 20.67 g/t).

• Overall highlighted intercepts: 14 m @ 6.68 g/t Au; 23.1 g/t AuEq over 1.9 m within a 5.8 m zone of 9.0 g/t AuEq.

• Underground Drilling – Phase 2

• All 27 holes intersect Creston and Perdido veins, confirming continuity north of existing workings.
• New breccia‑style zones: 27.1 g/t AuEq over 0.4 m; 13.1 g/t AuEq over 1.2 m.

• Representative underground intercepts (selected):

  • DDH25‑225 (Creston Hanging‑wall): 0.5 m @ 0.14 g/t Au, 86.80 g/t Ag (AuEq 3.40).
  • DDH25‑227 (Creston Hanging‑wall): 3.0 m @ 0.34 g/t Au, 52.88 g/t Ag (AuEq 2.68).
  • DDH25‑234 (Creston): 0.4 m @ 20.30 g/t Au, 200 g/t Ag (AuEq 27.13).
  • DDH25‑236 (Main Creston): 0.8 m @ 2.69 g/t Au, 200 g/t Ag (AuEq 14.43).

• Drill Program Scope

• Surface program: 6 holes completed (1,656 m of a planned 2,500 m).

• Underground Phase‑2: 27 holes drilled to date (6,200 m total).

• Next Steps

• Santiago: step‑out drilling targeting east‑ and west‑strike extensions.
• Underground: continue Phase‑2 to add mineable resources for near‑ and medium‑term mine plan.

Notable Quotes

“These are the first drill results from Santiago in more than 16 years, and they clearly demonstrate the potential for new, high‑grade resources.” – Paul D. Gray, VP Exploration, Luca Mining Corp.

All assay data were generated by Bureau Veritas using fire‑assay with AAS/gravimetric finish and ICP‑ES methods; qualified person: Paul D. Gray, P.Geo.