GR Silver Mining Expands Geological Model and a Clear Catalyst Path Through 2026

• GR Silver Mining is advancing a 20,000-metre drill programme at its San Marcial silver project in Mexico, with early holes confirming high-grade mineralisation and continuity to approximately 450 metres depth within a resource base of 134 million ounces of silver equivalent.
• The company has historically added resources at $0.12 per ounce while its shares currently imply a value of over $1.20 per ounce per resource ounce, a gap that underpins the core investment case as the resource continues to grow.
• Geological work is revealing a more complex system than previously mapped, with parallel breccia bodies, gold enrichment at depth, and copper-molybdenum surface anomalies pointing toward a potential porphyry model at the centre of the intrusive body.
• A bulk sample test mining programme is planned at the fully permitted Plomosas underground mine, with a 60 to 100 tonne-per-day pilot plant under assessment, targeting early cash generation, social licence, and a shorter permitting pathway for the larger San Marcial project.
• The company is fully financed with no debt and has outlined a structured sequence of near-term catalysts including further drill results, a mineral resource estimate update, a preliminary economic assessment, and the purchase and installation of a pilot plant.

GR Silver Mining (TSXV:GRSL) is navigating a period of transition while continuing to advance one of Mexico's more compelling silver exploration stories. Drilling continues at the San Marcial project, new geological understanding is emerging, and management has outlined a clear sequence of near-term milestones. Eric Zaunscherb, who has taken on the roles of Executive Chairman, Interim President, and Interim CEO, sat down to provide an update on operations, geology, and the company's strategic direction.

Leadership Transition and Operational Continuity

The passing of Marcio Fonseca, who founded the company and drove its exploration vision at San Marcial, represents a genuine loss both personally for the team and strategically for the company. Zaunscherb, who has known Fonseca for years and counts him as a mentor, has stepped in to manage continuity. He has recently visited Mexico, meeting with teams in Rosario, Sinaloa, Durango, and Mexico City, where the company has opened a new office to support its engineering work.

The immediate priority has been preventing disruption to field operations. Three drill rigs remain active on site, and the team led by VP Exploration Luis Coto is continuing the programme without pause. The message from management is that nothing material has changed in the execution plan. Talent gaps will be filled as needed, but the exploration thesis and the operational calendar remain intact.

Early Drill Results: Grade, Continuity, and Depth

The first two holes of the current 20,000-metre campaign have returned results that management characterises as strong. Hole 2601 intersected 6.5 metres grading 500 grams per tonne (g/t) silver, including 1.2 metres of 1,600 g/t silver. Notably, the same hole also returned 61 metres grading 15 g/t silver at depth, a lower-grade interval, but one that signals the system remains mineralised well below surface. Of particular significance, that upper intersection was found within an andesite dyke that geologists had previously considered barren.

Drilling is now underway with results expected in the near term with an important contextual point: at San Marcial, reported silver grades reflect silver specifically, not silver equivalent. Roughly 85-90% of intersections by value are silver, making grade comparisons particularly direct. The average thickness of the San Marcial breccia in the existing resource is 22 metres, which supports efficient ounce addition. Historically, the company has added resources at $0.12 per ounce against a current share price implying over $1.20 per ounce per resource ounce. That gap forms the core of the value proposition.

Complex and Potentially Larger Geological System

One of the more significant aspects of the conversation was Zaunscherb's outline of the evolving geological model. To date, drilling has only tested approximately 20% of the perimeter of the intrusive body that hosts the San Marcial breccia. The remaining 80% of that perimeter represents untested exploration ground, where high-grade silver is expected to occur in structurally analogous positions.

Beyond the original breccia, geological work led by Dr. Paula Montoya of the University of Tasmania's Centre for Ore Deposit and Earth Sciences (CODES) unit has identified parallel breccia bodies forming concentrically around the intrusive core. These inner structures are showing elevated gold contributions. Further toward the centre of the intrusive, surface sampling has detected copper and molybdenum, pointing to the possibility of a porphyry mineralisation model at depth.

As Zaunscherb explained:

"There's a porphyry model that one can start speaking of here: porphyry in the middle, parallel breccias as you come out, and then you see that breccia that the original San Marcial discovery was made upon. So it's quite exciting untangling all of that."

Within the main San Marcial breccia itself, the geological team has identified four to five distinct mineralisation pulses, adding complexity and potential scale to the system. Multiple boiling zones, a key geological feature in epithermal silver deposits, could stack vertically, potentially preserving or enhancing grades at depth. Testing has not yet extended below 450 metres.

Bulk Sample Programme and the Permitting Strategy

An mimportant element of GR Silver Mining is the planned bulk sample test mining programme at the Plomosas mine. This historical underground operation, located on the same property, has 7.4 kilometres of existing underground development and the necessary permits in place. A pilot plant of 60-100 tonnes per day is being assessed for installation on site.

The stated objectives of the programme includes generate early cash flow, support social licence with local communities and regulators, and potentially shorten the permitting timeline for San Marcial itself. That last point carries material financial significance as San Marcial currently holds exploration concession status; converting it to a producing operation under current Mexican regulatory frameworks could take 5 to 7 years in a conventional process. A demonstrated track record of responsible operations at Plomosas - and the beneficial externalities that result from that for surrounding community - could accelerate that timeline meaningfully.

Metallurgical testing is already underway to evaluate leaching potential and the possibility of producing doré on site. The pilot plant assessment, its purchase, and eventual installation are identified as near-term catalysts that investors can track.

Interview with Eric Zaunscherb, Chairman & CEO of GR Silver Mining Ltd.

Financial Position and Upcoming Catalysts

Zaunscherb confirmed the company is fully financed with cash on hand and no debt. That financial position is relevant context for the catalyst timeline he outlined. Near-term expected news releases include: additional drill results as the programme progresses toward 20,000 metres; a mineral resource estimate update expected following the completion of drilling in the second half of 2026; the commissioning of a preliminary economic assessment; and the purchase and installation of a pilot plant for the Plomosas bulk sample programme.

As Zaunscherb summarised:

"There's a good number of catalytic news items stacked out in the future over the next few months and for that, we're fully financed, with cash in the bank and no debt on the books."

The Investment Thesis for GR Silver Mining

• Significant resource base with growth potential. The company holds 134 million ounces of silver equivalent at San Marcial, with only approximately 20% of the intrusive perimeter drilled. The remaining 80% represents undrilled exploration ground in analogous geological positions to existing high-grade mineralisation.
• High-grade silver at scale. The San Marcial breccia averages 22 metres in true thickness with grades commonly exceeding 200 g/t silver. Reported grades reflect actual silver, not silver equivalent, providing a higher-quality comparison baseline.
• Expanding geological model. The identification of parallel breccia bodies, gold enrichment at depth, and a potential porphyry core suggests the system may be considerably larger and more diverse than the existing resource reflects. This widens the exploration upside beyond silver alone.
• Clear near-term catalyst pipeline. Investors have visibility on a structured sequence of milestones: drill results, an MRE update, a PEA, and the Plomosas pilot plant installation. Each milestone represents a discrete re-rating opportunity.
• Plomosas as a low-capital revenue pathway. A 60 to 100 tonne-per-day pilot plant at the fully permitted Plomosas underground mine offers early cash generation and social licence development while potentially accelerating San Marcial's permitting timeline by years.
• Debt-free and fully financed. With no debt and sufficient cash to fund the current programme, the company is not currently dependent on dilutive financing to execute its stated plan.
• Operational continuity through transition. Management has moved quickly to maintain drilling momentum following the loss of the founder and CEO. Three rigs remain active, field teams are retained and motivated, and the strategic direction is unchanged.
• Actionable consideration: Investors with a resource exploration risk appetite may wish to monitor upcoming drill results and the MRE update as the primary near-term valuation inflection points. Position sizing should account for the early-stage nature of the permitting pathway and the jurisdictional risk profile of operating in Mexico.

The Overlooked Precious Metal With an Industrial Backbone

Silver occupies a distinctive position in the commodity landscape in 2026. Unlike gold, which functions primarily as a monetary asset and inflation hedge, silver carries a dual mandate: it is simultaneously a store of value and an industrial input critical to modern technology. Roughly 50% of annual silver demand now derives from industrial applications, with solar photovoltaic manufacturing, electric vehicle components, and power electronics among the most rapidly growing end markets. The energy transition, far from being a headwind, is a structural tailwind for silver demand that shows no sign of reversing.

On the supply side, the picture is tightening. Primary silver mines account for a minority of global production, with the majority coming as a by-product of base metal mining. As base metal project development faces its own headwinds: permitting delays, capital intensity, and cost inflation which the incremental supply of by-product silver is constrained. Primary silver deposits of meaningful scale, such as San Marcial, are consequently becoming increasingly valuable as potential stand-alone contributors to supply.

The silver price has responded to these dynamics. After a prolonged period of underperformance relative to gold, silver has seen renewed institutional and retail interest as the gold-silver ratio has attracted attention from investors seeking relative value within the precious metals sector. In an environment where gold has made new nominal highs, silver retains a credible catch-up narrative supported by fundamentals rather than speculation alone.

For investors evaluating silver exploration companies, the opportunity lies in identifying projects where the cost of resource addition is low, the geological scale is large, and the path to production is credible. As Zaunscherb noted, GR Silver Mining has historically added ounces at $0.12 per ounce while trading at over $120 per ounce per resource ounce, a ratio that makes the supply-demand case for silver tangible at the company level.

TL;DR

GR Silver Mining holds 134 million ounces of silver equivalent at San Marcial, Mexico, and has historically added ounces at $0.12 each against a current market implied value exceeding $120 per ounce. A 20,000-metre drill programme is underway, with early results confirming high-grade silver to depth and a geological model that is expanding to include parallel breccias, gold at depth, and a potential porphyry core. The company is fully financed with no debt. Near-term catalysts include additional drill results, a resource update, a PEA, and a pilot plant installation at the fully permitted Plomosas mine. For investors, the gap between the cost of resource addition and the market's implied valuation represents the central opportunity that widens with each metre drilled.

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