Richmond Hill Resources Plc – Update re Martello Gold Project

Richmond Hill Resources PLC
(«Richmond Hill» or the «Company»)
Update re Martello Gold Project

Richmond Hill Resources PLC (AIM: RHR) announces that, further to the
announcement on 5 February 2026, a third-party contractor has now completed a
DRONE-MAG survey on the Martello Gold Project. The survey was conducted using a
DRONE-MAG system, consisting of a Blacksquare Hercules X4 drone, a GEM Systems
GSMP-35U potassium vapor magnetometer, and GEM Systems GSM-19 Overhauser base
stations.

From 16 – 25 February 2026, the contractor completed an airborne magnetic survey
using an Unmanned Aerial Vehicle (UAV) over the Martello Gold Project near
Dryden, Ontario, Canada. The survey was flown for Richmond Hill Resources
totalling 773.7 line-kilometres and was an add on to the previously flown survey
in 2023.

Richmond Hill has engaged Critical Discoveries to write an assessment report
based on the data provided by the contractor.

Hamish Harris, CEO of Richmond Hill, commented: «This survey now completes the
gap in previous work over our licences in the Martello Gold Project and provides
further information on the project as we look forward to our maiden drill
campaign which we expect to commence shortly. I look forward to updating the
market with respect to this shortly.»

Forward Looking Statements

This announcement contains forward-looking statements relating to expected or
anticipated future events and anticipated results that are forward-looking in
nature and, as a result, are subject to certain risks and uncertainties, such as
general economic, market and business conditions, competition for qualified
staff, the regulatory process and actions, technical issues, new legislation,
uncertainties resulting from potential delays or changes in plans, uncertainties
resulting from working in a new political jurisdiction, uncertainties regarding
the results of exploration, uncertainties regarding the timing and granting of
prospecting rights, uncertainties regarding the Company’s ability to execute and
implement future plans, and the occurrence of unexpected events. Actual results
achieved may vary from the information provided herein as a result of numerous
known and unknown risks and uncertainties and other factors.

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.

For further information, please contact:

Richmond Hill Resources Tel: +44 (0)787958 4153

Hamish Harris
Cairn Financial Advisers LLP (Nominated Adviser) Tel: +44 (0)20 7213 0880

Ludovico Lazzaretti / James Western
Clear Capital Limited (Broker) Tel: +44 (0) 20 3869 6080

Bob Roberts

Further information on the Company can be found on its website at
www.richmondhillresources.com

This information was brought to you by Cision http://news.cision.com