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[email protected] W amcconsultants.com Technical Report South Crofty Tin Project Mineral Resource Update Cornish Metals Inc. Cornwall, UK In accordance with the requirements of National Instrument 43-101 “Standards of Disclosure for Mineral Projects” of the Canadian Securities Administrators Qualified Persons: N Szebor, CGeol (London), EurGeol, FGS R Chesher, FAusIMM (CP) AMC Project 421007 Effective date 7 June 2021 Unearth a smarter way South Crofty Tin Project Mineral Resource Update Cornish Metals Inc. 421007 1 Summary 1.1 Introduction AMC Consultants (UK) Limited (AMC) was commissioned by Cornish Metals Inc. (Cornish Metals) to prepare a Technical Report (South Crofty Technical Report or Technical Report) on the South Crofty tin (copper-zinc) Property (Property) in Cornwall, United Kingdom. Cornish Metals is an Associate Company of Osisko Development Corporation; Barkerville Gold Mines, a subsidiary of Osisko Development Corp. holds 19.98% of the issued share capital. Cornish Metals is listed on both the Canadian TSX Venture Exchange (TSX-V: CUSN) as well as the London Alternative Investment Market (AIM: CUSN). Cornish Metals is incorporated federally in Canada under the CBCA with registered number 423627-1. The flagship projects held by Cornish Metals are the South Crofty tin (copper-zinc) and the United Downs copper-tin projects, both situated in Cornwall, United Kingdom. This report is a National Instrument 43-101 (NI 43-101) Technical Report on the updated Mineral Resources of the South Crofty Project (South Crofty Project or South Crofty) with an effective date of 7 June 2021.