Locksley Resources boosts antimony strike 400% in US
- James Pearson
- Oct 10, 2025
- 3 min read
ASX and US-listed Locksley Resources (ASX: LKY) has cranked the dial at its Mojave critical minerals project in California with a technical breakthrough that has quadrupled the strike length of its Desert antimony mine (DAM) corridor to 1.2 kilometres.
A 3D mapping program carried out over the last two months extended the Desert project’s mineralised corridor from 300 metres to a thumping 1.2 kilometres.
The new development appears to not only confirm the continuity of high-grade antimony-bearing shear zones, it has also uncovered a brand new second parallel structure 150 metres west, opening the door to a potential multi-zone system.
Locksley says the north-northeast striking shear zones, when combined with steeply dipping folds, could be key structures that control where the minerals form and are often linked to zones of high-grade lodes.
These features are precisely the kind of clean, vein-hosted stibnite shoots that Washington is scrambling to lock in, as the U.S. Defense and Energy Departments race to shore up domestic supplies for their critical minerals programs.
The company says the discovery has the geos rushing back to the drawing board. The fresh model has now pinpointed seven hot zones ripe for sampling, paving the way for a maiden exploration target and sharpening Locksley’s aim ahead of the next round of drilling.
And while the main prize of a parallel antimony structure at DAM may be stealing the headlines right now, it’s not the only part of the project throwing up surprises.
Almost 2.5kms southeast of DAM, first-pass mapping has also turned up a previously undocumented shaft and stockpile at the company’s Hendricks prospect. Early grab samples have delivered a solid silver result of 216 grams per tonne (g/t) silver, which is timely given that silver recently hit heady heights of US$51 an ounce. Other minerals in the mix included lead running at 0.3 per cent, zinc at 0.9 per cent zinc and 0.1 per cent copper.
Hendricks is shaping up as a geological mirror of the Desert antimony mine with structural features that look strikingly familiar. Mapping has revealed a web of north-northeast–trending shears that closely match the orientation of mineralisation at Desert, pointing to a broader, regionally consistent system with plenty of room for new discoveries.
A series of weathered and altered east-northeast to east-southeast shears have also been logged, which could potentially host additional antimony mineralisation, while scintillometer readings lit up across several volcanic dykes, hinting at the possibility of enriched rare earths zones.
Scattered across the ground are multiple prospecting pits and trenches dug around the historic Hendricks shaft, each chasing individual shear zones along the north-northeast trend. Eleven high-priority target areas have now been locked in for detailed follow-up sampling and mapping.
Locksley says the new model will underpin its next wave of 3D target generation and drill planning, setting the stage for Hendricks to slot in alongside DAM as a cornerstone of the company’s growing Mojave discovery story.
Meanwhile, just north of the legendary Mountain Pass rare earths mine, Locksley has wrapped up mapping at its Junipero prospect, where the discovery of deep-sourced volcanic dykes cutting through silica-rich host rocks has stirred excitement about a potential carbonatite-style rare earths system similar to Mountain Pass itself.
The fourfold expansion of the Desert antimony mine 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.
Locksley Resources CEO Kerrie Matthews
The company says it’s now preparing for a third round of structural mapping to kick off in November on its grounds, with the goal of firming up new targets across an 18-zone prospect map.
Locksley’s California landholdings sit in the heart of the Clark mining district and directly abut ground held by US rare earths major MP Materials. With no current domestic antimony production and Chinese dominance over global supply, Locksley’s timing and growing footprint could not be better.
With drilling approvals progressing a JORC target on the horizon and its saddle bags full of cash after a recent $5.3 million capital raising, Locksley and Mojave are shaping as serious contenders in America’s critical minerals race.
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