3.05 meters grading 12,494 g/t AgEq, including 0.65 meters grading 24,548 g/t AgEq

Site preparation for the exploration decline underway at Caracol

Sinda Ltd. (NYSE: SIND) (“Sinda” or the “Company”) today reported the highest-grade drill intercept to date from infill drilling at Caracol within the Sinda Silver-Gold Project (the “Project”) in Guanajuato, Mexico, and provided an update on site preparation work for its planned exploration decline.

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Figure 1 — Plan view of the Sinda Project showing Caracol, Don Diego and Agaves with selected drill intercepts

Highlights

• Drillhole CECA-26-039-A, drilled inside the existing Inferred Mineral Resource at Caracol as part of the Dolores infill program, intersected:
  • 3.05 m at 12,494 g/t AgEq, including
    • 0.65 m at 24,548 g/t AgEq
• Portal activities advancing at Caracol, with initial site preparation targeted for completion by year-end 2026

Daniel Muñiz, Executive Chairman of Sinda, commented, "This constitutes the highest-grade intercept we have reported at Sinda, and it came from infill drilling inside our existing resource area at Caracol. A result of this caliber, in an area of the district where we are actively converting resources, reinforces our steadfast conviction that Sinda is one of the most important silver-gold discoveries in Mexico — if not the world. We expect the strength of these results to be reflected in our updated Mineral Resource Estimate at year-end. At the same time, site preparation now underway at Caracol represents yet another important step forward for the Project. The planned exploration decline will provide underground access and enable more efficient drilling as we continue to advance Sinda up the value chain."

About the Intercept

CECA-26-039-A intersected the HD3 vein within the Dolores vein system at Caracol, from 485.10 to 488.15 meters, inside the outline of the Company’s current Inferred Mineral Resource. The interval comprises a quartz-calcite vein displaying crustiform-colloform textures with disseminated pyrite and sphalerite. The intercept was returned from the Dolores infill drilling program and further demonstrates both the continuity and high-grade potential of the Caracol area. Results from this drilling are expected to be incorporated into the Company’s planned year-end 2026 Mineral Resource Estimate update.

Phase 2 Drilling Program

As previously discussed in the Company’s second quarter results, Sinda is executing its Phase 2 surface drilling campaign following completion of approximately 60,810 meters of Phase 1 drilling. Phase 2 targets an additional 122,000 meters through the end of 2027 and combines resource conversion drilling at Caracol, infill drilling at Agaves, step-out and exploration drilling across the Don Diego corridor and other priority targets, and geotechnical drilling supporting future underground development. At Don Diego, between the Caracol and Agaves resource areas, drilling is advancing from both ends to test a possible structural linkage between the two mineralized zones — ground not included in the Company’s current Mineral Resource estimates or Exploration Targets.

The Company currently operates 16 drill rigs across the district and expects to expand to 18.

Sinda expects to provide additional assay results from the ongoing drilling program as they are received and interpreted. A summary of high-grade drilling results to date is provided in Table 1 below.

Table 1 — High-grade drilling results to date from the Caracol and Don Diego programs

Exploration Decline – Site Preparation Advancing

Portal activities at Caracol continue to advance, and initial works at the waste rock storage facility are expected to commence next week. Initial site preparation is expected to be completed by the end of the fourth quarter of 2026.

As previously disclosed, the approximately 9-kilometer decline received environmental impact authorization in March 2026 and is being developed to production-sized dimensions of 5.5 meters by 5.5 meters — providing underground access for more efficient and targeted infill drilling of the Caracol system. Once underground drill stations become available, shorter drilling distances relative to surface drilling are expected to enable progressively tighter drill spacing and more efficient resource conversion. The decline has also been designed with the dimensions and flexibility to potentially support further mine development, subject to the results of future technical and economic studies.

(Refer to Figure 1)

Quality Assurance / Quality Control

Diamond drill core is logged, photographed and sampled by Sinda personnel in accordance with established geological and QA/QC procedures. Core samples are split, with one-half submitted for laboratory analysis and the remaining half retained for reference.

Samples are analyzed by ALS, an independent and accredited laboratory.

Sinda’s QA/QC program includes systematic insertion of certified reference materials, blanks and duplicate samples into the sample stream. QA/QC results are reviewed on an ongoing basis and no material QA/QC issues have been identified in connection with the results reported herein.

Qualified Person

The scientific and technical information contained in this news release has been reviewed and approved by Berkley J. Tracy, MSc, PG, CPG, PGeo of SRK Consulting (U.S.), Inc., an independent Qualified Person as defined under Item 1300 of Regulation S-K.

About Sinda Ltd.

Sinda is a silver exploration and development company with mineral projects in Mexico, that has already identified an estimated 369 million silver-equivalent ounces of Inferred Mineral Resources and 16 million silver-equivalent ounces of Indicated Mineral Resources, plus incremental Exploration Targets of 452–484 million silver-equivalent ounces that, while conceptual in nature and insufficiently explored to estimate a mineral resource, offer line of sight to a base of more than 800 million silver-equivalent ounces on only 38% of the known veins drilled. Backed by experienced mining investors and a management team with deep Mexican operating experience, Sinda expects to execute an aggressive exploration and drilling program, and to construct its underground exploration decline en route to commercial production. For more information, visit https://sinda.mx/en/.

Cautionary Note Regarding Mineral Resources and Exploration Targets

Inferred Mineral Resources are subject to significant uncertainty as to their existence and as to their economic and legal feasibility. The level of geological uncertainty associated with an Inferred Mineral Resource is too high to apply relevant technical and economic factors likely to influence the prospects of economic extraction in a manner useful for evaluation of economic viability.

Exploration Targets are separate from classified Mineral Resources. The ranges of potential tonnage and grade of the Exploration Targets are conceptual in nature. There has been insufficient exploration of the relevant property to estimate a Mineral Resource with respect to these Exploration Targets. It is uncertain if further exploration will result in the estimation of a Mineral Resource. The Exploration Targets therefore do not represent, and should not be construed to be, an estimate of a Mineral Resource or Mineral Reserve. Exploration Targets could change as the proposed exploration activities are completed.

Forward Looking Statements

This press release contains forward-looking statements, including statements regarding the interpretation and significance of the drilling results described herein, the timing and outcome of the Company's planned year-end 2026 Mineral Resource Estimate update, the scope, timing and results of the Company's Phase 2 drilling program, including the Company's plans to expand its drill rig fleet, the timing and completion of site preparation and construction activities for the exploration decline at Caracol and the anticipated benefits thereof, including any potential to support future mine development, and the Company’s future liquidity position and business strategy. These statements are not historical facts but rather are based on the Company’s current expectations and projections regarding its business, operations, and other factors relating thereto, including assumptions regarding future silver and gold prices used to calculate silver-equivalent values. Words such as “may,” “might,” “could,” “would,” “achieve,” “budget,” “scheduled,” “forecasts,” “target,” “should,” “expects,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “potential” or “continue” and similar expressions are used to identify these forward-looking statements. All forward-looking statements speak only as of the date on which they are made. These statements are not guarantees of future performance and involve certain risks, uncertainties and assumptions concerning future events that are difficult to predict, including risks related to the interpretation of exploration and drilling results, the ability to convert Inferred Mineral Resources to higher confidence categories, the risk that Exploration Targets will not be delineated as a Mineral Resource, fluctuations in metal prices, the receipt and maintenance of required permits and authorizations, and the other risk factors described in the Company's filings with the U.S. Securities and Exchange Commission. Therefore, actual future events or results may differ materially from these statements. Except as required by law, the Company assumes no obligation to update any forward-looking statements to conform these statements to actual results or revised expectations. We caution you not to place undue reliance on these forward-looking statements.

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