Locksley Resources (ASX:LKY) Expands Mojave Antimony Target Fourfold in Major Structural Mapping Breakthrough

Jane Morgan Management

10 October 2025 – Perth, Australia | ASX-listed critical minerals explorer Locksley Resources Limited (ASX:LKY, OTCQB:LKYRF, FSE:X5L) has today announced a significant advancement at its Mojave Project in California, with recent structural mapping resulting in a fourfold increase in strike length of the target mineralised corridor at the Desert Antimony Mine (DAM) Prospect. This major development has expanded the target zone from 0.3 km to 1.2 km and unveiled the potential for a broader multi-zone polymetallic system.

The updated geological model has not only enhanced the scale and exploration potential of the DAM Prospect, but has now also identified a new parallel shear zone approximately 150 metres west of the main structure. The findings support the Mojave Project as a district-scale critical minerals hub, well-aligned with U.S. policy priorities aimed at securing domestic supply chains for essential minerals such as antimony.

Structural modelling has also defined seven high-priority surface sampling targets to support the delineation of a JORC Exploration Target, laying the groundwork for future drilling campaigns. In addition, the program has mapped 18 broader targets across the project area and highlighted the presence of lamprophyre dykes, pointing to deep-seated, mantle-tapping structures that may host further critical mineral occurrences, including carbonatites.

First-pass mapping at the Hendricks Prospect, which is located 2.5 km southeast of DAM, revealed a previously undocumented historical shaft and associated workings. Initial sampling returned high-grade silver assays of up to 216 g/t Ag, with anomalous lead (0.3% Pb), zinc (0.9% Zn), and copper (0.1% Cu), confirming the presence of a broader polymetallic system. Structural parallels between Hendricks and DAM suggest strong regional mineralisation continuity. Eleven priority zones have been identified for further sampling, and a 3D geological model is currently under development.

Junipero Prospect Reinforces Regional Scale

Mapping at the Junipero Prospect, which is located just 1.1 km north of the Mountain Pass Mine, has identified multiple east-west trending lamprophyre dykes and felsic intrusives, which collectively suggest favourable conditions for rare earth element (REE) mineralisation. A 3D geological model has been completed and integrated with broader Mojave datasets to guide future exploration.

Locksley Resources CEO Kerrie Matthews commented: “Our second structural mapping program at the Mojave Project has markedly advanced our geological understanding and confirmed the substantial exploration potential of this critical district. The fourfold expansion of the Desert Antimony Mine (DAM) target horizon has fundamentally changed the scale of the opportunity, demonstrating the potential for a much larger mineralised system. This success, coupled with high-grade silver confirmed at Hendricks and the identification of multiple regional shear zones, has effectively lit up the entire Mojave Project for polymetallic vein discoveries. These outstanding results strongly validate our rapid exploration and development strategy, aligning perfectly with the accelerating U.S. government focus on securing domestic critical mineral supply chains.”

Next Steps

A third-phase structural mapping program is scheduled to commence in late November 2025. This will include detailed surface sampling across defined targets and further mapping to support drill program planning at both the DAM and El Campo Prospects.

About Locksley Resources Limited 

Locksley Resources Limited is an ASX listed explorer focused on critical minerals in the United States of America. The Company is actively advancing exploration across two key assets: the Mojave Project in California, targeting rare earth elements (REEs) and antimony. Locksley Resources aims to generate shareholder value through strategic exploration, discovery and development in this highly prospective mineral region. 

Mojave Project 

Located in the Mojave Desert, California, the Mojave Project comprises over 491 claims across contiguous prospect areas, namely, the North Block/Northeast Block and the El Campo Prospect. The North Block directly abuts claims held by MP Materials, while El Campo lies along strike of the Mountain Pass Mine and is enveloped by MP Materials’ claims, highlighting the strong geological continuity and exploration potential of the project area. 

In addition to rare earths, the Mojave Project hosts the historic “Desert Antimony Mine”, which last operated in 1937. Despite the United States currently having no domestic antimony production, demand for the metal remains high due to its essential role in defense systems, semiconductors, and metal alloys. With significant surface sample results, the Desert Mine prospect represents one of the highest-grade known antimony occurrences in the U.S. 

Locksley’s North American position is further strengthened by rising geopolitical urgency to diversify supply chains away from China, the global leader in both REE & antimony production. With its maiden drilling program planned, the Mojave Project is uniquely positioned to align with U.S. strategic objectives around critical mineral independence and economic security. 

Tottenham Project 

Locksley’s Australian portfolio comprises the advanced Tottenham Copper-Gold Project in New South Wales, focused on VMS-style mineralisation in a well established mining region. Locksley is committed to delivering value through discovery, development, and strategic partnerships, with a focus on securing access to U.S. aligned funding and downstream collaborations.

Jane Morgan
Jane Morgan Management
Investor & Media Relations
[email protected]