Richmond Hill Resources Plc – Martello update

14 April 2026

Richmond Hill Resources Plc

(«Richmond Hill» or the «Company»)

Martello update

Richmond Hill Resources announces that its drilling programme at the Martello
Gold Project has now been completed with cores having been sent to Winnipeg to
be submitted for assaying. In aggregate 1,307 metres («m») of drilling was
completed across seven holes.

Hole TB26-001 intersected an 84m Quartz Feldspar Porphyry («QFP») unit with high
gold potential, highly silicified with colours ranging from dark grey to pale
green. The interval from 104m to 156m contained sparse quartz veinlets bearing
sulphides, with a notable 8cm quartz vein at 128.3m. Below the QFP, a medium
-grained mafic intrusive (diorite) unit extended from 156m to 187.75m. Two
brecciated and sheared carbonate veins bearing sulphides were observed in the
lower mafic volcanic sequence and will be tested for gold potential.

Hole TB26-002 yielded significant mineralisation within the QFP unit with two
QFP intercepts measuring 45.5m and 14m in thickness. Minor quartz veining with
disseminated pyrite was observed throughout. The hole also intersected
substantial brecciated quartz veining in sheared mafic volcanics, including a
22cm vein and 40cm vein with pyrite clots. Historical gold association with
sheared mafic volcanics will be tested.

Hole TB26-003 reached target depth. Early drilling through the target interval
at 101 metres encountered diorite with several fault zones but no QFP or
significant veining intersected to date in this location.

Hole TB26-004 intercepted QFP from 114.5-122m, 126-129m and 134.75-136.25m.
Drilling was shut down early due to intercepting relatively barren mafic
volcanic rock.

Hole TB26-005 intercepted QFP from 28m to 64m: a 32m interception of the unit.
One 15cm breccia vein was observed in the unit.

Hole TB26-006: the QFP unit ended at approximately 179.5m with a total thickness
of 38.5m.

HoleTB26-007: QFP intersection from 130 to 156m with a thickness of 26m.
Brecciated quartz vein from 156 to ~156.75m with sulphides.

Drilling Details

+——–+—+——-+—+—————-+—————+——–+
|Hole ID |Pad|Azimuth|Dip|Target Depth (M)|Final Depth (M)|Status |
+——–+—+——-+—+—————-+—————+——–+
|TB26-001|1 |260 |80 |175 |200 |Complete|
+——–+—+——-+—+—————-+—————+——–+
|TB26-002|1 |215 |70 |200 |200 |Complete|
+——–+—+——-+—+—————-+—————+——–+
|TB26-003|2 |60 |70 |200 |200 |Complete|
+——–+—+——-+—+—————-+—————+——–+
|TB26-004|3 |240 |70 |200 |176 |Complete|
+——–+—+——-+—+—————-+—————+——–+
|TB26-005|3 |20 |75 |125 |125 |Complete|
+——–+—+——-+—+—————-+—————+——–+
|TB26-006|4 |260 |75 |200 |200 |Complete|
+——–+—+——-+—+—————-+—————+——–+
|TB26-007|4 |210 |80 |200 |206 |Complete|
+——–+—+——-+—+—————-+—————+——–+

Hamish Harris commented: «It’s pleasing to have finished our maiden drilling
campaign in good time and we look forward to receiving the assay results in the
coming weeks.»

Qualified Person

The technical information contained in this disclosure has been read and
approved by Sheldon Modeland, P.Geo, a director of the Company and a current
member of Association of Professional Geoscientists of Saskatchewan and acts as
the Qualified Person under the AIM Rules – Note for Mining and Oil & Gas
Companies.

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.

Richmond Hill Resources Tel: +44 (0) 203 582 6636

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

Caution regarding forward looking statements

Certain statements in this announcement, are, or may be deemed to be, forward
looking statements. Forward looking statements are identified by their use of
terms and phrases such as »believe», »could», «should» »envisage»,
»estimate», »intend», »may», »plan», »potentially», «expect», »will»
or the negative of those, variations or comparable expressions, including
references to assumptions. These forward looking statements are not based on
historical facts but rather on the Directors’ current expectations and
assumptions regarding the Company’s future growth, results of operations,
performance, future capital and other expenditures (including the amount, nature
and sources of funding thereof), competitive advantages, business prospects and
opportunities. Such forward looking statements reflect the Directors’ current
beliefs and assumptions and are based on information currently available to the
Directors.

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