Locksley Resources powers US antimony revival with scorching test resultsC
- James Pearson
- Sep 22, 2025
- 3 min read
Locksley Resources (ASX: LKY) has delivered a potential game-changer at the company’s Mojave project in California after revealing a cracking set of metallurgical results from an analysis of the antimony mineralisation at site.
And the punters are piling in. The stock has screamed to yet another all-time high of 69 cents a share - a jaw-dropping 3700 per cent surge since May.
The company’s test work on samples from its Desert antimony mine prospect has thrown up exceptional recoveries of between 82.9 per cent and 85.9 per cent, with concentrate grades comfortably breaching the 35 per cent stibnite threshold in five out of six tests.
One sample returned a blistering 59.6 per cent stibnite, indicating that the antimony can be easily released from the host rock.
The initial tests were conducted on surface spoils, which are largely oxidised material. Once the drill rigs start churning out fresh, unweathered rock, Locksley says it expects the results to get even better.
Armed with these spectacular findings, the company now believes the Desert prospect could catapult it into the cockpit of America’s critical minerals revival and deliver an all-domestic antimony supply chain for the first time in decades.
This is an excellent milestone and demonstrates conventional flotation technology is suitable to produce a stibnite concentrate from the Desert antimony mine prospect. This activity continues to rapidly advance our strategy to provide onshore supply of antimony to the US market.
Locksley Resources Technical Director Julian Woodcock
In a country with no current antimony production, the need for a domestic supply is fast becoming urgent. Antimony is used in everything from ammunition and semiconductors to flame retardants and military-grade alloys.
Historically, the US has leaned on foreign production for its antimony. However, when China - responsible for 80 per cent of global supply - cut off exports 12 months ago, it sparked a frantic push to secure local sources of the critical metal.
Locksley says the metallurgical green light has now kicked its development into overdrive. Samples have already been shipped to the company’s technology partner, Houston’s Rice University, to undergo DeepSolv testing.
DeepSolv is a cutting-edge hydrometallurgical extraction technique that uses deep eutectic solvents capable of melting ore at lower temperatures, offering a cleaner, low-energy alternative to traditional smelting.
If its technology works successfully, Locksley will mark a first on American soil by turning concentrate into antimony metal, oxide and trisulphide without having to rely on offshore processing.
Locksley is also eyeing a pilot-scale program to demonstrate the full mine-to-market loop from Californian rock to end-use products. Further regrind and cleaning stages are underway to target higher grades up to 50 per cent stibnite and better recoveries.
The company’s grounds wrap neatly around MP Materials’ famed Mountain Pass rare earths mine, placing the Mojave project in prime real estate territory. It has already attracted the attention of Washington insiders and has locked in advisory heavyweights GreenMet to boost its profile in DC.
With high-grade recoveries, near-term drill plans and a downstream strategy already in motion, Locksley’s push to bring antimony back to American soil is quickly turning into one of the more compelling critical minerals stories out there.
As the US scrambles to decouple from Chinese supply chains, this Aussie junior may have just found itself in the right place at exactly the right time.
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