Additional Mining Claims near Martello

Richmond Hill Resources Plc

("Richmond Hill" or the "Company")

Additional Mining Claims near Martello

Richmond Hill Resources Plc (AIM: RHR) is pleased to announce that, in addition to the announcement on   21 April 2026, regarding the completion of the acquisition   of the Bartlett Mining Claims, the Company has acquired an additional 28 mining claims covering 546 hectares via staking as per the map below titled Project Expansion. These claims were acquired for minimal cost (CAD$1,400).

Capitalised terms used in this announcement shall, unless otherwise defined, have the same meanings as set out in the Company's announcement on 7 April 2026.

This announcement contains inside information for the purposes of the UK Market Abuse Regulation and the Directors of the Company are responsible for the release of this announcement.

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Further information on the Company can be found on its website at https://richmondhillresources.com/