CUSN Cornish Metals Inc.

CORNISH METALS FILES TECHNICAL REPORT FOR THE SOUTH CROFTY TIN PROJECT PRELIMINARY ECONOMIC ASSESSMENT ON SEDAR+

Vancouver, May 28, 2024

Cornish Metals Inc. (AIM/TSX-V: CUSN) ("Cornish Metals" or the "Company"), is pleased to report that it has filed a technical report pursuant to National Instrument 43-101 - Standards for Disclosure for Mineral Projects ("NI 43-101") for its 100% owned and permitted South Crofty tin project in Cornwall, United Kingdom under Cornish Metals' profile on Sedar+ (www.sedarplus.com). The Company's news release dated April 30, 2024 summarises the positive results of the Preliminary Economic Assessment ("PEA").

The technical report, titled "South Crofty PEA" (the "Technical Report") was prepared by AMC Consultants (UK) Limited on behalf of Cornish Metals. The Qualified Persons ("QPs") for the PEA are Mr Nicholas Szebor, MCSM, CGeol, EurGeol, FGS, Regional Manager (UK) and Principal Geologist (AMC); Mr Dominic Claridge, FAusIMM, Principal Mining Engineer (AMC); Ms Angela Collins, Dip BA MRTPI, Principal Planner (SLR); Mr Barry Balding, P.Geo., EurGeol, Technical Director - Mining Advisory Europe (SLR); Mr Steve Wilson, ACSM, C.Eng., FIMMM, Managing Director: Europe (P&C); Mr Mike Hallewell, FIMMM, FSAIMM, FMES, C.Eng. (Independent Consultant); and Dr Barrie O'Connell, ACSM, FIMMM, C.Eng. (Independent Consultant). QPs under NI 43-101 and Competent Persons as defined under the JORC Code (2012).

ABOUT CORNISH METALS

Cornish Metals is a dual-listed mineral exploration and development company (AIM and TSX-V: CUSN) focused on advancing the South Crofty high-grade, underground tin project through to a construction decision, as well as exploring its additional mineral rights, located in Cornwall, United Kingdom.

·    South Crofty is a historical, high-grade, underground tin mine that started production in 1592 and continued operating until 1998 following over 400 years of continuous production;

·    The Project possesses Planning Permission for underground mining (valid to 2071), to construct new processing facilities and all necessary site infrastructure, and an Environmental Permit to dewater the mine;

·    South Crofty has one of the highest grade tin Mineral Resources globally and benefits from existing mine infrastructure including multiple shafts that can be used for future operations;

·    The 2024 Preliminary Economic Assessment for South Crofty validates the Project's potential (see news release dated April 30, 2024):

o  US$201 million after-tax NPV_8% and 29.8% IRR

o  3-year after-tax payback

o  4,700 tonnes average annual tin production in years two through six

o  Life of mine all-in sustaining cost of US$13,660 /tonne of payable tin

o  Total after-tax cash flow of US$626 million from start of production

·    Tin is a Critical Mineral as defined by the UK, American, and Canadian governments;

·    Approximately two-thirds of the tin mined today comes from China, Myanmar and Indonesia;

·    There is no primary tin production in Europe or North America;

·    Tin connects almost all electronic and electrical infrastructure, making it critical to the energy transition - responsible sourcing of critical minerals and security of supply are key factors in the energy transition and technology growth;

·    South Crofty benefits from strong local community, regional and national government support. 

·    Cornish Metals has a growing team of skilled people, local to Cornwall, and the Project could generate up to 320 direct jobs.

TECHNICAL INFORMATION

This news release has been reviewed and approved by Mr Owen Mihalop, MCSM, BSc (Hons), MSc, FGS, MIMMM, CEng, Chief Operating Officer for Cornish Metals Inc. who is the designated Qualified Person under NI 43-101 and a Competent Person as defined under the JORC Code (2012). Mr. Mihalop consents to the inclusion in this announcement of the matters based on his information in the form and context in which it appears.

ON BEHALF OF THE BOARD OF DIRECTORS

"Kenneth A. Armstrong"

Kenneth A. Armstrong P.Geo.

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Neither the 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.

Caution regarding forward looking statements

This news release contains certain "forward-looking information" and "forward-looking statements" (collectively, "forward-looking statements"). Forward-looking statements include predictions, projections, outlook, guidance, estimates and forecasts and other statements regarding future plans, the realisation, cost, timing and extent of mineral resource or mineral reserve estimates, estimation of commodity prices, currency exchange rate fluctuations, estimated future exploration expenditures, costs and timing of the development of new deposits, success of exploration activities, permitting time lines, requirements for additional capital and the Company's ability to obtain financing when required and on terms acceptable to the Company, future or estimated mine life and other activities or achievements of Cornish Metals, including but not limited to: mineralisation at South Crofty, mine dewatering and NCK Shaft refurbishment expectations; the development, operational and economic results of the PEA, including cash flows, capital expenditures, development costs, extraction rates, recovery rates, mining cost estimates; estimation of mineral resources; statements about the estimate of mineral resources; magnitude or quality of mineral deposits; anticipated advancement of the South Crofty project mine plan; future operations; the completion and timing of future development studies; anticipated advancement of mineral properties or programmes; Cornish Metals' exploration drilling programme, exploration potential and project growth opportunities for the South Crofty tin project and other Cornwall mineral properties and the timing thereof, timing and results of Cornish Metals' feasibility study, the Company's ability to evaluate and develop the South Crofty tin project and other Cornwall mineral properties, strategic vision of Cornish Metals and expectations regarding the South Crofty mine, timing and results of projects mentioned. Forward-looking statements are often, but not always, identified by the use of words such as "seek", "anticipate", "believe", "plan", "estimate", "forecast", "expect", "potential", "project", "target", "schedule", "budget" and "intend" and statements that an event or result "may", "will", "should", "could", "would" or "might" occur or be achieved and other similar expressions and includes the negatives thereof. All statements other than statements of historical fact included in this news release, are forward-looking statements that involve various risks and uncertainties and there can be no assurance that such statements will prove to be accurate and actual results and future events could differ materially from those anticipated in such statements.

Forward-looking statements are subject to risks and uncertainties that may cause actual results to be materially different from those expressed or implied by such forward-looking statements, including but not limited to: risks related to receipt of regulatory approvals, risks related to general economic and market conditions; risks related to the availability of financing; the timing and content of upcoming work programmes; actual results of proposed exploration activities; possible variations in Mineral Resources or grade; outcome of the current Feasibility Study; projected dates to commence mining operations; failure of plant, equipment or processes to operate as anticipated; accidents, labour disputes, title disputes, claims and limitations on insurance coverage and other risks of the mining industry; changes in national and local government regulation of mining operations, tax rules and regulations. The list is not exhaustive of the factors that may affect Cornish's forward-looking statements.

Cornish Metals' forward-looking statements are based on the opinions and estimates of management and reflect their current expectations regarding future events and operating performance and speak only as of the date such statements are made. Although the Company has attempted to identify important factors that could cause actual actions, events or results to differ from those described in forward- looking statements, there may be other factors that cause such actions, events or results to differ materially from those anticipated. There can be no assurance that forward-looking statements will prove to be accurate and accordingly readers are cautioned not to place undue reliance on forward-looking statements. Accordingly, readers should not place undue reliance on forward-looking statements. Cornish Metals does not assume any obligation to update forward-looking statements if circumstances or management's beliefs, expectations or opinions should change other than as required by applicable law.