Endeavour Silver Terronera drilling: mine-life extension lens for planners
Reviewed by Tom Sullivan

First reported on MINING.com
30 Second Briefing
Endeavour Silver’s latest drilling at the Terronera mine in Jalisco, Mexico, is returning high-grade intercepts outside the current 10‑year mine plan, including 10 metres at 282 g/t silver and 1.8 g/t gold in hole TRU‑001 and 9 metres at 150 g/t silver and 6.3 g/t gold in TRU‑003. Two rigs are testing extensions on the main Terronera vein and the La Luz system through Q4, with La Luz hits such as 2.95 metres at 176 g/t silver and 3.84 g/t gold (LL‑44) confirming mineralisation remains open along strike and at depth. With Terronera already hosting 7.38 million proven and probable tonnes at 197 g/t silver and 2.25 g/t gold, analysts see scope for resource growth and mine‑life extension as underground drill platforms are developed.
Technical Brief
- TRU‑004 and TRU‑006 deliver 6.0 m @ 119 g/t Ag, 4.05 g/t Au and 6.6 m @ 130 g/t Ag, 3.1 g/t Au, respectively.
- All 20 La Luz intercepts reported are <3 m true width, indicating narrower but high‑grade vein shoots.
- Several La Luz holes drilled below the existing resource envelope confirm mineralisation remains open along strike and down‑dip.
- Terronera reached commercial production in October 2025 and is currently planned as a 10‑year operation.
- 2026 mine sequencing targets lower‑grade stopes in H1, then transitions to higher‑grade zones in H2 to lift head grades.
- Nameplate 2026 guidance is 2.4–2.6 Moz Ag and up to 36,000 oz Au as ramp‑up continues.
- December 2024 reserves total 7.38 Mt at 197 g/t Ag and 2.25 g/t Au (46.7 Moz Ag, 534 koz Au).
Our Take
Endeavour Silver’s focus on Terronera in Jalisco sits alongside its move to sell the Bolañitos mine in Guanajuato (US$50 million deal with Guanajuato Silver, November 2025), suggesting a deliberate pivot from mature assets to a smaller number of higher-grade, longer-life silver-gold operations in Mexico.
With Terronera’s proven and probable reserve base of 7.38 Mt at 197 g/t silver and 2.25 g/t gold, the project screens in our database as one of the higher-grade primary silver assets among recent Mexico and Central America coverage, which typically features lower head grades and stronger by-product credits.
National Bank Financial also appears in coverage of Vizsla Silver’s Panuco project in Sinaloa, indicating that its analysts are building a comparative view across multiple Mexican silver-gold districts, which can influence how capital allocators benchmark Terronera’s risk and upside against peer projects.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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