Winston: Mine Tailings Investigation Collaboration

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THIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION FOR THE PURPOSES OF ARTICLE 7 OF REGULATION 2014/596/EU WHICH IS PART OF DOMESTIC UK LAW PURSUANT TO THE MARKET ABUSE (AMENDMENT) (EU EXIT) REGULATIONS (SI 2019/310) ("UK MAR"). UPON THE PUBLICATION OF THIS ANNOUNCEMENT, THIS INSIDE INFORMATION (AS DEFINED IN UK MAR) IS NOW CONSIDERED TO BE IN THE PUBLIC DOMAIN.

PANTHER METALS PLC

("Panther" or the "Company")

(Incorporated in the Isle of Man with company number 009753V)

19 June 2025

Winston Project: Mine Tailings Investigation Collaboration

Panther Metals Plc (LSE: PALM), the exploration company focused on mineral projects in Canada, is pleased to announce it has agreed a collaboration with London AIM market listed Fulcrum Metals Ltd (AIM: FMET, "Fulcrum") to investigate the potential commercialisation of the historical mine processing tailings storage facility located on the Winston Project ("Winston" or the "Project) in Ontario, Canada.

Fulcrum is a company focussed on the pioneering the use of innovative technology to recover precious metals from mine tailings at their Teck-Hughes Gold Tailings Project, in Ontario, Canada.

The collaboration underscores both companies' shared vision to responsible resource management, innovative recovery technologies, and strategic value creation and is a precursor to an exciting opportunity for both companies to assess the viability of extracting value from the historical mine processing tailings located at the Project's Winston Lake Mine site (Figure 1), where the required access and power infrastructure is already in place (Figure 2).

A modern, sustainable approach to mine waste reprocessing and precious metal capture potentially offers Panther a shorter pathway to significant cashflow, which could be deployed towards extending the 8.5 year mine life envisaged in the 2021 mine redevelopment Feasibility Study.1

Past Production

The development of the Winston Lake Mine was commenced in 1986 by Inmet Mining Limited, and subsequently acquired by First Quantum Minerals Limited. Between 1988 and 1998, a reported 3.3 million tonnes (Mt) of ore was mined and processed with an average head grade of 14.6% Zn, 1.0% Cu, 32.2g/t Ag and 1.4g/t Au, producing 900 million pounds (Mlbs) or 408 thousand tonnes (kt) of zinc, 54 Mlbs (24 kt) copper, with over 1.1 Moz silver and 51,168 oz gold at reported recoveries of 93% zinc and 78% copper. The operation was finally closed in February 1999 due to a very low zinc price at the time (US$0.42/lb). 1,2

Darren Hazelwood, Chief Executive Officer, commented:

"This collaboration is the first step in investigating a potential early source of positive cashflow for Panther at the Winston Project. The infrastructure is well maintained on the brownfield Winston Lake mine site allowing for the potential rapid evaluation and monetisation of the historical mine processing tailings.

Working with Fulcrum Metals, who are advancing mine-tailings reprocessing project elsewhere in Ontario, we intend to explore innovative ways to generate additional value and potentially extend the life of our flagship project. It's a strong step forward in our mission to build a sustainable and profitable future for our shareholders."

Ryan Mee, CEO of Fulcrum Metals Ltd, added:

"We're excited to be collaborating with Panther Metals on this promising opportunity. Fulcrum brings advanced extraction and separation technology to the table through its relationship with Extrakt Process Solutions, which offers cyanide free and environmentally sensitive hydrometallurgical techniques designed to recover critical and precious metals from legacy tailings. This aligns perfectly with our focus on unlocking overlooked value and accelerating resource recovery in a responsible way."

The collaboration envisages setting out a formal agreement for an initial phase of a partnership which would focus on technical and economic assessments of the tailings material. Subject to the results of that evaluation, Panther and Fulcrum would formalise a commercial agreement to advance a tailings pre-processing project.

Key Highlights:

· The collaboration to agree terms for a strategic partnership between Panther Metals and Fulcrum Metals to evaluate the Winston tailings storage facility.

· Application of modern hydrometallurgical extraction technology to maximise recovery while minimising environmental impact

· Low-cost, high-impact opportunity with upside potential for both parties.

· Supports long-term sustainability goals through reprocessing of legacy materials

· All infrastructure well maintained and in place for rapid execution of the opportunity should it exist.

This development underscores both companies' shared commitment to responsible resource management, innovative recovery technologies, and strategic value creation.

Figure 1: Location of Winston Lake Project, Ontario, Canada

Figure 2: Winston Lake Minesite Infrastructure including Plant Site, Tailings and Water Storage Facilities 2

Technical References

1. NI 43-101 Technical Report Feasibility Study for the Superior Zinc and Copper Project, dated 13 October 2021, prepared for Metallum Resources Inc by DRA Global ("DRA").

2. Ontario Ministry of Mines Record ID MDI42D14NW00015. Schnieders et al, 1999. OFR5989, Report of Activities 1998, p. 5 ( https://www.geologyontario.mines.gov.on.ca/persistent-linking?mineral-inventory=MDI42D14NW00015 )

Competent Person Statement

Technical information in this announcement has been reviewed by Nicholas O'Reilly BSc (Hons) MSc DIC MIMMM QMR MAusIMM FGS, a director of the Company. Mr O'Reilly is principal geologist and a director of Mining Analyst Consulting Ltd. He has over 20 years' experience in mining, exploration and development across all major commodities. As a qualified geologist, he can act as Competent Person for JORC Code and UK Listing Rules purposes.

The person who arranged for the release of this information is Darren Hazelwood, the Company's Chief Executive Officer.

For further information, please contact:

Panther Metals PLC:

Darren Hazelwood, Chief Executive Officer: +44(0) 1462 429 743

+44(0) 7971 957 685

Broker:

SI Capital Limited

Nick Emerson +44(0) 1438 416 500

Winston Project

The Panther Metals Winston Project, located 50 km east of Thunder Bay, Ontario, Canada, is an advanced stage polymetallic zinc, copper and precious metal property comprising a high-grade critical mineral mine redevelopment and resource building opportunity. Based on a Feasibility Study published in 2021 the Project is expected to generate average life of mine ("LOM") annual EBITDA of C$67.64 million (M) and have a pre-tax NPV8% of C$ 175.8 M and IRR of 26%, with further strong exploration potential for defining additional Mineral Resources and Mineral Reserves from the two main deposits as well as additional near-mine volcanogenic massive sulphide ("VMS") exploration targets.

2021 Feasibility Study Headline Metrics

· NPV8%: C$175.8M pre-tax, assuming zinc priced at US$2,700/t, copper at US$7,300/t, gold at US$1,635/oz & silver at US$21/oz. At a derisked 6% discount Pre-tax NPV = C$213.2M.

· IRR: 26% pre-tax

· EBITDA : C$574.9M (gross), C$67.64M (annual). Gross revenue: C$983.3M

· CAPEX: C$145.1 M

· OPEX: C$65.17/t

· LOM: Initial 8.5 year life of mine, with 3.5 year pay-back period. Strong potential to increase LOM.

· Producing an average 33.40ktpa contained zinc,1.3ktpa contained copper, 698oz recovered gold and 90.8koz recovered silver (after ramp-up), from an onsite processing facility with an annualised 326ktpa capacity.

· The unit pricing for copper, gold and silver, concentrate payable percentages and exchange rates, are positively different from 2021 in today's dollars, providing scope for additional value uplift.

· Indicated Resource 2.07 Million Tonnes @ 18% Zn

· Volcanogenic Massive Sulphide mineralisation well understood by Panther.

· Panther plans to build value through extending the mine life utilising the Company's strong local exploration network and leveraging institutional, governmental and critical mineral programme support.

· No name discussions in Canada have indicated strong support for this deal on an asset base previously supported by industry heavyweights, including Sprott.

· Strong prospects to increase Mineral Resources and Mineral Reserves through exploration down-dip and along strike of the current Resources.

· Zinc and Copper deemed Critical Minerals in Canada, eligible for enhanced tax-efficient flow-through funding.

· Positive First Nation engagement.

· Strong Institutional and Governmental support for future financing options.

· Existing historical tailings storage facility offers potential for near-term cash-flow subject to further studies.

Highly prospective near mine exploration targets include the Pick Lake Deposit which is not fully constrained and is considered to be open down-plunge; the Winston Lake Deposit where there are strong electromagnetic ("EM") geophysics conductive bodies adjacent to the current Resource; and in the vicinity of historical Zenith deposit. The wider project area is relatively underexplored and there are several prospective surface zinc targets, including Anderson, Trial and Ciglen, and the VMS hosting horizons along strike strongly warranting geophysical investigation.

The 2021 Feasibility Study1 for the Winston Project detailed a strong economic case for mine redevelopment for a 1,000 tonnes per day underground operation with a net present value (NPV8%) of C$171.5M and pre-tax internal rate of return (IRR) of 26% based on an Ore Reserve of 1.96Mt @ 13.9% Zn, 0.6% Cu with significant gold and silver credits (Table 1) producing an expected 69.8 thousand tonnes per year (ktpa) of zinc concentrate and 5.3 ktpa of copper concentrate over an initial 8.5 year mine life. The Project boasts a high-grade CIM compliant Indicated Mineral Resource2 of 2.07Mt averaging 17.9% zinc, 0.8% copper, 0.4 g/t gold, and 34 g/t silver plus Inferred 0.27Mt @ 16.2% Zn, 1.0% Cu, 0.3g/t Au & 37.2g/t Ag (Table 2). Project is located only 20km from the trans-Canada highway and infrastructure including power, tailings storage facility, transport links and underground development are already in place. The previous mining operation closed in February 1999 due to very low zinc prices at the time. In total, 3.4 million tonnes grading 1.0% copper and 16% zinc was mined and processed. The total project area covers approximately 60.4km2 and comprises both patented freehold, leased and Crown-land mining claims.

Table 1: Winston Project Mineral Reserve

Notes: JORC (2012) compliant Mineral Reserve effective date 5 July 2019. Ore Reserves are based solely on Indicated Mineral Resources and are reported above an average net smelter return (NSR) cut-off grade of US$98 /t equivalent to 5.2% Zn. 1

Table 2: Winston Project Mineral Resource Estimate at 3% Zn cut-off grade

Notes: Effective date 15 October 2020. Stated at 3% zinc cut-off grade. Mineral Resource estimate is compliant with the Canadian Institute of Mining, Metallurgy and Petroleum ("CIM"), CIM Standards on Mineral Resources and Reserves, Definitions and Guidelines prepared by the CIM Standing Committee on Reserve Definitions. Mineral resources which are not mineral reserves do not have demonstrated economic viability. There has been insufficient exploration to define the inferred resources tabulated above as an indicated or measured mineral resource, however, it is reasonably expected that the majority of the Inferred Mineral Resources could be upgraded to Indicated Mineral Resources with continued exploration.

Technical References:

1 NI 43-101 Technical Report Feasibility Study for the Superior Zinc and Copper Project, dated 13 October 2021, prepared for Metallum Resources Inc by DRA Global ("DRA").

2 NI 43-101 Technical Report on the Mineral Resource Estimation of the Pick Lake and Winston Lake Properties, Ontario, Canada, dated 15 October 2020, prepared for CROPS Inc. (renamed Metallum Resources Inc) by MASSA Geoservices.

Obonga Project - Expanding Canada's Next VMS and Critical Minerals District

Panther Metals' Obonga Project in Ontario continues to demonstrate significant potential as a leading exploration initiative targeting both base and critical minerals. Since acquiring the Obonga Greenstone Belt in July 2021, the Company has rapidly advanced five high-priority targets: Wishbone, Awkward, Survey, Ottertooth, and Silver Rim.

In June 2024, Panther secured a key Exploration Permit for the Wishbone Prospect, valid through 2027, authorizing extensive drilling and geophysical surveys. Previous campaigns confirmed compelling volcanogenic massive sulphide (VMS)-style mineralisation, highlighted by intercepts such as 27.3m of massive sulphide and 51m of sulphide-dominated mineralisation with multiple mineralised lenses. High-grade copper anomalies in lake sediment further enhance the prospectivity of this landmark target.

July 2024 saw Panther awarded an Exploration Permit for Awkward West, supporting an aggressive exploration program including up to 31 drill holes. Historic drilling here revealed notable graphite mineralisation-27.2m at 2.25% Total Graphitic Carbon (TGC) with zones exceeding 5% TGC-alongside promising signs of nickel, copper, and platinum group elements, aligning with Panther's strategic focus on critical minerals.

Additional exploration efforts include high-resolution magnetic geophysical surveys across key prospects, optimizing drill targeting and advancing the geological model. Survey and Ottertooth remain highly prospective, with multiple magnetic and electromagnetic anomalies and historic intercepts of massive sulphides, many targets still largely untested.

Obonga's combination of VMS-style base metals and critical mineral potential, situated in a stable and mining-friendly jurisdiction with strong infrastructure, positions Panther Metals to unlock a district-scale mineral system with significant commercial upside.

Dotted Lake Project - Hemlo-Adjacent Gold Opportunity with Growing Momentum

Panther Metals' Dotted Lake Project, acquired in July 2020, lies just 16km from Barrick Gold's renowned Hemlo Mine, in one of Canada's premier gold-producing regions. The project offers a strategically located and scalable gold exploration play.

Initial soil sampling in 2021 identified numerous gold and base metal targets, and subsequent access improvements facilitated an initial drilling program that confirmed gold mineralisation with anomalous values extending along strike.

In early 2025, Panther completed a follow-up campaign featuring detailed geological mapping, trenching, and targeted diamond drilling. These efforts extended mineralisation both laterally and at depth, identified new structural controls, and reinforced the potential for a broader, high-grade gold system. Multiple zones have been prioritised for expanded drilling, underscoring Dotted Lake's significant upside.

The project's proximity to established infrastructure and Hemlo's extensive mining operations, combined with robust recent results, makes Dotted Lake a key asset in Panther's growth portfolio.

Commercial Strategy - Discovery-Driven Value Creation

Panther Metals is committed to creating substantial shareholder value through focused exploration and disciplined capital management. The Company combines deep geological expertise with an understanding of market and financing dynamics to advance high-potential projects efficiently.

With access to a global network of industry leaders and a rigorous operational focus on drilling, Panther prioritises activities that directly contribute to discovery and resource growth. The drill hole remains the ultimate validation in mineral exploration, and Panther's strategy is to fast-track world-class targets into drill-ready assets - delivering tangible results that underpin long-term value creation for shareholders.