Viscount Mining Advances Next Phase of Exploration in Colorado: Expanded Work Programs at the Kate Silver Resource and Passiflora Copper-Gold Porphyry Deposit

Rhea-AI Summary

Viscount Mining (OTCQB: VLMGF) has announced advancement plans for its Silver Cliff Project in Colorado, focusing on two key areas: the Kate Silver Resource (KSR) and the Passiflora copper-gold porphyry deposit. The KSR currently contains 10.3 million ounces of measured and indicated silver at 72 g/t and 14.2 million ounces inferred at 52 g/t.

At Passiflora, recent drilling discovered significant mineralization, with hole PF-03A intersecting 843.9 metres averaging 0.214% CuEq, including higher-grade zones. The company plans to explore two breccia pipes and integrate results from a 598-sample SGS MMI soil survey with geophysics data.

The project's potential has been enhanced by silver's recent surge to over $40/oz and its addition to the U.S. Critical Minerals List in February 2025.

Positive

• Discovery of continuous mineralization at Passiflora with 843.9m averaging 0.214% CuEq
• Silver price surge to over $40/oz represents ~60% value uplift for existing resource
• Silver's addition to U.S. Critical Minerals List enhances strategic value
• Current NI 43-101 resource of 10.3M oz measured & indicated silver plus 14.2M oz inferred
• Potential to validate additional 25M oz of historical silver estimates

Negative

• Additional engineering and economic studies required to determine recoverable value
• Historical 60M oz silver resource at Passiflora not NI 43-101 compliant
• Requires further drilling and exploration to validate expansion potential

Vancouver, British Columbia--(Newsfile Corp. - September 9, 2025) - Viscount Mining Corp. (TSXV: VML) (OTCQB: VLMGF) is pleased to outline the next stages of exploration at its flagship Silver Cliff Project in Custer County, Colorado. Building on a strong technical foundation and recent discovery success, the Company is advancing both the Kate Silver Resource ("KSR") and the Passiflora porphyry Copper-Gold deposit with expanded programs designed to grow resources and better focused drill targeting.

Advancing the Kate Silver Resource

The Kate Deposit currently hosts a NI 43-101 compliant resource of 10.3 million ounces measured and indicated at an average grade of 72 g/t silver, plus 14.2 million ounces inferred at 52 g/t silver. The upcoming program will integrate surface mapping, geochemical sampling, and geophysics to delineate drill targeting. The goal is to expand the existing resource by validating up to 25 million ounces of historical silver estimates and adding these into the compliant framework.

Figure 1: Kate Silver Resource plan view with NI 43-101 shells, expansion zones, and historical +25 Moz potential. (Not NI  43-101 Compliant)

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Figure 2: Kate Silver Resource cross-section (E-W) showing mineralized and high-grade zones.

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Silver Market and Critical Mineral Status

In February 2025, the U.S. Department of the Interior added silver to its Critical Minerals List, underscoring the metal's strategic role in electrification, clean energy technologies, and national security. This designation comes as silver prices recently surged through the US$40/oz level, their highest since 2011. Analysts from Bloomberg and Kitco highlight that silver's breakout reflects structural deficits and record demand from solar panels, electric vehicles, and grid-scale energy storage.

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Based on the most recent NI 43-101 report for the Kate Silver Resource, the project hosts 10.3 million ounces of silver in the measured and indicated category and 14.2 million ounces inferred, at grades of 72 g/t and 52 g/t respectively. When the study was completed, silver was trading near the US$25/oz level. With silver now trading above US$40/oz, the conceptual in-situ value of the existing compliant resource increases substantially (~60% uplift), underscoring the potential economic significance of Silver Cliff. While additional engineering and economic studies are required to determine recoverable value, the stronger silver market provides a compelling backdrop for expanding the resource base and advancing the project.

Next Steps at the Passiflora Copper - Gold Porphyry Deposit

Viscount's recent discovery drilling at the Passiflora target has confirmed the presence of a robust copper-gold porphyry deposit. The Company's first deep hole, PF-03A, intersected 843.9 metres of continuous mineralization averaging 0.214% CuEq, including multiple higher-grade zones such as 189 metres at 0.326% CuEq and 45 metres at 0.417% CuEq. These grades are well above the ~0.15% CuEq thresholds commonly reported in early-stage porphyry programs that later evolved into world-class, long-life operations. Importantly, mineralization in PF-03A remains open in all directions and at depth, with copper grades strengthening toward the bottom of the hole.

The results clearly establish Passiflora as a copper-gold porphyry deposit, characterized by thick intervals of copper mineralization with significant gold credits and supporting polymetallic values. This geological classification is significant, as porphyry copper-gold deposits are among the largest and longest-lived deposits globally, frequently hosting billions of tonnes of ore.

Building on this discovery the next phase of exploration will focus on reverse circulation drilling to efficiently test two breccia pipes previously mapped by the United States Geological Society, interpreted as vertical conduits that may concentrate higher-grade mineralization. In parallel, Viscount will integrate results from a 598-sample SGS MMI soil survey with induced polarization and resistivity geophysics to refine targeting across the broader porphyry footprint. Permitting for drilling has commenced.

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Beyond copper and gold, the Company also intends to revisit at the Passiflora the historical 60 million ounce silver resource reserve calculation by CoCa Resources released in 1983 which indicated at least 64M oz. silver at 51.9 G/T (not NI 43-101 compliant) stating, "a sustained advance in silver price to the $15 level would make the deposit quite attractive (R. A. Rivera, 1983)." Viscount will apply modern QA/QC protocols to assess its potential inclusion in future NI 43-101 compliant estimates.

Viscount Mining believes the combination of a strengthening silver market, critical mineral designation, and dual opportunities at Kate and Passiflora create exceptional growth potential for the Silver Cliff Project.

Qualified Persons

The scientific and technical information contained in this news release has been reviewed and approved by Harald Hoegberg PG, an independent consulting geologist who is a "Qualified Person" (QP) as such term is defined under National Instrument 43-101 - Standards of Disclosure for Mineral Projects ("NI 43-101").

Technical Appendix: Exploration Methodology

The exploration program will be executed using industry-standard methods and NI 43-101-compliant protocols. Soil sampling grids are designed on a 15 m x 75 m spacing, covering 900 m by 675 m, with assays conducted using SGS's proprietary MMI l technology. QA/QC procedures include certified standards, blanks, and field duplicates inserted at a 1:20 frequency. Geophysical work will comprise ground magnetics and induced polarization surveys to map structural controls and identify chargeability highs associated with disseminated sulfides. All data will be securely managed, with oversight by a Qualified Person to ensure NI 43-101 compliance.

About Viscount Mining (TSXV: VML) (OTCQB: VLMGF)

Viscount Mining is a project generator and an exploration company with a portfolio of silver and gold properties in the Western United States, including Silver Cliff in Colorado and Cherry Creek in Nevada.

The Silver Cliff property in Colorado lies within the historic Hardscrabble Silver District in the Wet Mountain Valley, Custer County, south-central Colorado. It is located 44 miles WSW of Pueblo, Colorado, and has year-around access by paved road. The property consists of 96 lode claims where high grade silver, gold and base metal production came from numerous mines during the period 1878 to the early 1900's. The property underwent substantial exploration between 1967 and 1984. The property is interpreted to encompass a portion of a large caldera and highly altered sequence of tertiary rhyolitic flows and fragmental units which offers potential to host deposits with both precious and base metals. This has been demonstrated in the mineralization historically extracted from the numerous underground and surface mining operations. The Kate Deposit currently hosts a NI 43-101 compliant resource of 10.3 million ounces measured and indicated at an average grade of 72 g/t silver, plus 14.2 million ounces inferred at 52 g/t silver. Viscount's recent discovery drilling at the Passiflora target has confirmed the presence of a robust copper-gold porphyry deposit. The Company's first deep hole, PF-03A, intersected 843.9 metres of continuous mineralization averaging 0.214% CuEq, including multiple higher-grade zones such as 189 metres at 0.326% CuEq and 45 metres at 0.417% CuEq.

The Cherry Creek property encompasses a district-scale tenure of 219 unpatented and 17 patented claims (plus mill rights) in the historic Cherry Creek Mining District of White Pine County, Nevada-approximately 50 miles north of Ely. This extensive mineralized land package includes more than 20 past-producing mines with proven infrastructure and deep mining heritage. The district has a rich legacy of silver, gold, tungsten (notably from veins and skarns), and associated CRD (carbonate replacement deposit) style mineralization. It also shows strong potential for molybdenum and copper, interpreted to be tied to porphyry-related systems that could underlie the existing vein networks.

Cherry Creek's geology spans multiple styles-ranging from quartz vein-hosted silver-gold-tungsten veins in carbonate and quartzite formations, to CRD occurrences, jasperoid zones, and porphyry-targeted alteration in early Paleozoic marine sediments. The combined geologic complexity and preserved claim block make it one of Nevada's most promising multi-metal exploration districts.

For additional information regarding the above noted property and other corporate information, please visit the Company's website at www.viscountmining.com

ON BEHALF OF THE BOARD OF DIRECTORS

"Jim MacKenzie"

President, CEO and Director
For further information, please contact:
Viscount Investor Relations
Email: info@viscountmining.com

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

Forward-Looking Statements

This news release includes certain statements that may be deemed "forward-looking statements" within the meaning of applicable Canadian securities legislation. Forward-looking statements include, but are not limited to, statements with respect to Viscount Mining's operations, exploration and development plans, expansion plans, estimates, expectations, forecasts, objectives, predictions and projections of the future. Specifically, this news release contains forward looking statements with respect to the actual size of the anomaly, feasibility, grade of mineralization and the content of the mineralization. Generally, forward-looking statements can be identified by the forward-looking terminology such as "plans", "expects" or "does not expect", "is expected", "budget", "scheduled", "estimates", "projects", "intends", "anticipates", or "does not anticipate", or "believes", or "variations of such words and phrases or state that certain actions, events or results "may", "can", "could", "would", "might", or "will" be taken", "occur" or "be achieved". Forward-looking statements are subject to known and unknown risks, uncertainties and other factors that may cause the actual results, level of activity, performance or achievements of Viscount Mining to be materially different from those expressed or implied by such forward-looking statements, including but not limited to: risks related to the exploration and development and operation of Viscount Mining's projects, the actual results of current exploration, development activities, conclusions of economic evaluations, changes in project parameters as plans continue to be refined, future precious metals prices, as well as those factors discussed in the sections relating to risk factors of our business filed in Viscount Mining's required securities filings on SEDARPlus. Although Viscount Mining has attempted to identify important factors that could cause results to differ materially from those contained in forward-looking statements, there may be other factors that cause results to be materially different from those anticipated, described, estimated, assessed or intended.

There can be no assurance that any forward-looking statements will prove accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements. Viscount Mining does not undertake to update any forward-looking statements that are incorporated by reference herein, except in accordance with applicable securities laws.

To view the source version of this press release, please visit https://www.newsfilecorp.com/release/265563

FAQ

What is the current NI 43-101 resource at Viscount Mining's Kate Silver Resource (VLMGF)?

The Kate Deposit contains 10.3 million ounces measured and indicated at 72 g/t silver, plus 14.2 million ounces inferred at 52 g/t silver.

What were the significant drilling results at Viscount Mining's Passiflora deposit?

The first deep hole (PF-03A) intersected 843.9 metres of continuous mineralization averaging 0.214% CuEq, including 189 metres at 0.326% CuEq and 45 metres at 0.417% CuEq.

How has the silver price affected Viscount Mining's Silver Cliff project value?

With silver prices rising from $25/oz to over $40/oz, the conceptual in-situ value of the existing compliant resource has increased by approximately 60%.

What is the significance of silver being added to the U.S. Critical Minerals List for Viscount Mining?

The February 2025 addition underscores silver's strategic importance in electrification, clean energy technologies, and national security, potentially enhancing the project's strategic value.

What are Viscount Mining's next exploration steps at the Passiflora deposit?

The company will conduct reverse circulation drilling of two breccia pipes and integrate results from a 598-sample SGS MMI soil survey with induced polarization and resistivity geophysics for refined targeting.