Locksley Resources (ASX:LKY) lifts 9% ore to 93% antimony as DeepSolv gets real

Electrodeposition of pure metallic antimony from raw ore quietly shifts this from lab experiment to processing pathway

Locksley Resources (ASX:LKY) has taken another step forward in its collaboration with Rice University, with new results showing raw ore containing 9 to 12% antimony was upgraded to a product grading up to 93% Sb using the DeepSolv hydrometallurgical process.

That is a big jump. Concentrates already sitting at 65 to 70% Sb were pushed to between 91 and 96%, and the Rice team also managed to recover pure metallic antimony directly from raw ore through electrodeposition. In plain English, they dissolved the ore in a low-temperature solvent and then used an electric current to deposit clean antimony metal at the other end.

The reason this matters is that it starts to knit together a full processing chain in one place. Locksley now has laboratory evidence of dissolution, oxide recovery and metal recovery from the same feedstock, all without the high-temperature smelting that dominates the current global antimony industry.

For a company that only three months ago was showing 99.5% purity antimony trioxide via pyrometallurgy, this second pathway is starting to look genuinely competitive rather than a backup option.

Why two processing routes now matter more than one

Locksley has been running two parallel processing pathways for a while. The high-temperature pyrometallurgical route has already produced 99.5% purity antimony trioxide at bench scale, and today’s news lifts the DeepSolv hydrometallurgical route into the same conversation.

The commercial logic is straightforward. Smelting is capital-heavy, energy-hungry and environmentally intensive, which makes it a hard sell in a permitting environment that is anything but friendly to new US metal smelters. A lower-temperature, solvent-based process that can produce both antimony oxide and antimony metal is a genuinely different proposition for permitting timelines and capex.

Our take is that today’s result also changes the intellectual property conversation. Under the Sponsored Research Agreement, IP is jointly owned by Locksley and Rice, and the more distinct the DeepSolv process becomes, the more it looks like an asset that could stand on its own beyond the Mojave feedstock.

The US antimony gap is what makes any of this investable

The backdrop has not changed since we last covered Locksley. US antimony demand sits at roughly 27,500 tonnes a year, and domestic refining capacity is around 1,500 tonnes. China dominates the rest, and antimony is now formally classified as a critical mineral in the US.

That structural gap is what turns a laboratory result into something worth watching. A process that can take raw US ore and produce metallic antimony without leaning on Chinese refiners is, on paper, exactly the kind of pathway US defence and industrial buyers have been asked to underwrite.

The skeptical read is that laboratory-scale recovery of 93% Sb is a long way from a commercial pilot producing tonnes per day. Locksley has to prove solvent recyclability, work out reactor and filtration design and then actually build something. Each of those steps carries technical and funding risk.

What the next phase actually has to prove

The next work program moves in three directions at once. Further purification and single-phase oxide production at higher solid-to-liquid ratios, solvent recyclability testing using recycled DeepSolv, and pilot-scale equipment evaluation covering reactor and filtration systems.

Solvent recyclability is the one to watch. A hydrometallurgical process that consumes solvent on a one-shot basis has a very different cost curve to one that recycles cleanly, and this is the number that will most influence whether DeepSolv is genuinely competitive with existing routes.

Pilot-scale equipment selection also flags that Locksley is starting to think about capex seriously. That is a subtle but important signal. Companies do not spend money assessing reactor designs unless they are moving from research toward engineering.

The Investors Takeaway for Locksley Resources

Locksley’s story has moved on quickly this year. Three months ago the market was digesting 99.5% purity antimony trioxide from the pyrometallurgical route, and now DeepSolv has produced pure metallic antimony from raw ore. That is real progress, and it broadens the strategic optionality if a US defence or industrial partner ever comes looking.

The next 12 months are about proving the process at pilot scale and, quietly, about the cash position. With around A$2.2m in the tank at last look and a growing engineering workload, we would not be surprised to see a capital raise arrive before pilot construction begins in earnest.

Investors can read our previous coverage of Locksley’s antimony story at stocksdownunder for a closer look at how the pyrometallurgical pathway got here. From today, the question shifts. Can DeepSolv match, or beat, the route Locksley has already proven works?