8 September 2025

First Development Resources plc

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

Wallal Phase I Drilling Programme underway

First Development Resources plc (AIM: FDR) a UK based, Australian focused exploration company with mineral interests in Western Australia and Australia's Northern Territory, is pleased to announce that the Phase I Diamond Drilling Programme at the Company's Wallal Project is underway. The drilling programme has been designed to test the Eastern magnetic bullseye anomaly identified at FDR's Wallal Project in the Paterson Province of Western Australia.

The 28 August 2025 announcement in respect of the Phase I Diamond Drilling Programme may be viewed below through the following link:

Wallal Phase I Diamond Drilling Update - 07:00:07 28 Aug 2025 - FDR News article | London Stock Exchange

Figure 1:FDR Wallal Phase I diamond drilling underway, Paterson Province, Western Australia, September 2025

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

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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 flagship 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.