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30 June 2026

First Development Resources plc

('First Development", "FDR" or the "Company')

Site Preparation Commences at Lander West

Drill Rig Expected to Arrive on Site in the Coming Days

First Development Resources plc (AIM: FDR), the UK-based, Australia-focused mineral exploration company, is pleased to announce that site preparation activities have commenced at the Company's flagship Lander West Gold Target within the Selta Project in Australia's Northern Territory.

The Company's field team has mobilised to the Lander West project area and has commenced final site preparation activities ahead of the Company's maiden Phase I Reverse Circulation ("RC") drilling programme. The drill rig is expected to arrive on site in the coming days, with drilling anticipated to commence shortly thereafter.

HIGHLIGHTS

·    Site preparation has commenced at the Lander West Gold Target.

·    Drill rig expected to arrive on site in the coming days.

·    All regulatory approvals and statutory requirements now complete.

·    Phase I RC drilling anticipated to commence following rig mobilisation and final site preparations.

Tristan Pottas, Chief Executive Officer of FDR, commented:

"The commencement of site preparation at Lander West represents an important milestone in the advancement of the Selta Project as we prepare for our maiden Phase I RC drilling programme.

Over recent months we have systematically advanced Lander West through geological interpretation, geophysical surveying, geochemical sampling, permitting and drill targeting. With our field team now on site and the drill rig expected to arrive on site in the coming days, we are entering an exciting new phase for the Company.

We now look forward to commencing our maiden drilling programme at Lander West and testing the high-priority gold targets identified through our systematic exploration programme."

SITE PREPARATION COMMENCES

The Company's field team, led by recently appointed Exploration Manager Dr David Rawlings, has commenced final site preparation activities (Figure 1), including construction of access tracks, establishment of drill pads and additional geological reconnaissance designed to optimise the initial drilling programme. Dr Rawlings will oversee the execution of the Company's maiden Phase I RC drilling programme at Lander West, working alongside the Company's operational team throughout the campaign.

These activities are being undertaken ahead of the planned arrival of the RC drill rig.

The Company expects GeoDrill Australia's drill rig to arrive at Lander West in the coming days. Drilling is expected to commence following completion of rig mobilisation and final site preparations.

Figure 1: Site preparation activities underway at the Lander West Gold Target ahead of the Company's maiden Phase I RC drilling programme.

PHASE I RC DRILLING PROGRAMME

The Phase I RC drilling programme will test a series of high-priority gold targets generated through the Company's integrated geological, geochemical and geophysical exploration programme.

The programme represents the first drill test of several compelling gold targets identified along the prospective Stafford Gold Trend.

The upcoming programme is the culmination of many months of systematic exploration, technical evaluation, permitting and target generation and represents a significant milestone in the advancement of the Company's flagship Selta Project.

The commencement of site preparation marks the transition from project planning to execution as the Company prepares to undertake its maiden drilling campaign at Lander West.

The Company looks forward to providing shareholders with further updates as mobilisation progresses and drilling commences.

For further information visit www.firstdevelopmentresources.com or contact the following:

Beaumont Cornish Limited ("Beaumont Cornish") is the Company's Nominated Adviser and is authorised and regulated by the FCA. Beaumont Cornish's responsibilities as the Company's Nominated Adviser, including a responsibility to advise and guide the Company on its responsibilities under the AIM Rules for Companies and AIM Rules for Nominated Advisers, are owed solely to the London Stock Exchange. Beaumont Cornish is not acting for and will not be responsible to any other persons for providing protections afforded to customers of Beaumont Cornish nor for advising them in relation to the proposed arrangements described in this announcement or any matter referred to in it.

ABOUT FIRST DEVELOPMENT RESOURCES

First Development Resources' assets comprise eight granted tenements covering a total area of 2,314.4km². Five of the tenements, comprising three prospective copper-gold projects, are located in Western Australia (WA) while the remaining three tenements, comprising a rare-earth element (REE), uranium, lithium and gold project, are located in the Australian's Northern Territory. All tenements are wholly owned by FDR. The assets are a mixture of drill ready and earlier stage exploration.

The WA Projects include the Company's Wallal Project as well as Ripon Hills and Braeside West Projects situated in the Paterson Province, which is widely regarded as one of the most productive regions in Australia for the discovery of world-class gold-copper deposits, and which is home to several world-class mines and more recent discoveries.

The Selta Project in the Northern Territory is located in an area considered highly prospective for uranium and rare-earth element mineralisation along with base and precious metal mineralisation. Numerous companies are actively exploring within the region.

Beyond the existing portfolio, FDR is actively looking to expand its portfolio through the acquisition of early-stage exploration projects in Australia.