ARPA-E Backs a Muon Imager Built to Travel to Site

Lawrence Berkeley National Laboratory and Ideon Technologies have received ARPA-E funding for a project to develop a path toward field-deployable, active-source muon imaging technology aimed at accelerating critical mineral discovery and development.

A project led by Lawrence Berkeley National Laboratory, with the Canadian imaging company Ideon Technologies as partner, has secured funding from ARPA-E to work toward a transportable muon imager. The stated goal is a path to field-deployable, active-source muon imaging technology — equipment that could be moved to an exploration site rather than assembled around a fixed installation — with critical mineral discovery and development named as the target application.

The award was announced through Global Mining Review. The dollar value and the program timeline were not disclosed in the announcement, so the size of the bet is not yet public. What is public is the direction of travel: a US national laboratory and a commercial imaging vendor are being funded to take a physics technique that has largely lived in research settings and specialist deployments and make it something an exploration crew can put on a truck.

What a muon imager actually does underground

Muons are heavy, short-lived subatomic particles. They pass through rock, and how many make it through depends on how much mass is in the way. Put a detector below or beside a target volume, count the muons arriving from each direction over time, and you can reconstruct a three-dimensional map of density — the geophysical equivalent of a medical X-ray, except the rock is the patient and the imaging volume can be hundreds of metres across.

That density contrast is exactly what exploration geologists care about. Many ore bodies — massive sulphides, iron formations, certain skarns and intrusion-hosted systems — are denser or less dense than the rock around them. Voids, old workings and altered zones show up as anomalies too. Conventional gravity and seismic surveys infer density from the surface with limited resolution at depth; drilling resolves it precisely but only along a pencil-thin line, at high cost per metre.

The commercial version of the technique to date relies on cosmic-ray muons: particles produced when high-energy cosmic rays strike the upper atmosphere, arriving free of charge but at a rate nobody controls. That is the constraint the new project is aimed at. An active source means generating muons deliberately rather than waiting for the sky to supply them — which, in principle, means shorter survey times, control over the geometry of the measurement, and the ability to image in orientations that a downward-raining natural flux cannot serve.

Why the word 'transportable' is doing the heavy lifting

Producing muons on demand normally implies a particle accelerator, and accelerators are large, power-hungry and permanently installed. Shrinking one to something that can be trucked into a remote exploration camp, powered off a generator, and operated by people who are not particle physicists is the engineering problem the funding is meant to attack. It is a classic ARPA-E profile: high technical risk, long payoff, and a clear line to a national supply-chain objective if it works.

That objective is critical minerals. Copper, nickel, cobalt, graphite, rare earths and lithium all sit on government critical or strategic lists in one form or another, and the binding constraint on new supply is not usually demand — it is the decade-plus lag between a discovery and a producing mine, and the fact that the easy, near-surface deposits in mature jurisdictions were found generations ago. New discoveries increasingly sit under cover: hundreds of metres of barren overburden with no surface expression at all.

The exploration economics the technique is aiming at

Exploration under cover is a numbers game with terrible odds. Companies drill to test a geophysical target, most holes miss, and each miss consumes budget and a slot in a tight drill-rig schedule. Anything that raises the hit rate changes the arithmetic of an entire program, because the cost is concentrated in the drilling and the value is concentrated in the few holes that land.

A density image of the rock between and around existing holes attacks that problem directly. It does not replace drilling — assays still decide what is ore — but it can tell a geologist where the dense anomaly is not, which is often the more valuable information. For a junior developer running on a financing that has to last until the next raise, cutting the number of wasted holes is the difference between extending a resource and going back to market.

There is a second market the technology touches: existing operations. Density imaging around a working mine can help map old workings, monitor cave progression, or check the geometry of a stope without sending anyone into it. Those are safety and productivity applications with a shorter path to revenue than greenfield discovery, and they tend to be where new geophysical tools find their first paying customers.

What to watch from here

Three things will tell you whether this becomes a tool or stays a paper. The first is whether the team publishes a source specification — the energy, the flux, the footprint of whatever muon generator they settle on — because that determines whether "transportable" means a shipping container or a Pelican case. The second is a field trial on a known ore body, where the reconstructed image can be checked against drill data that already exists. The third is cost per survey against cost per drill metre; a technique that images beautifully but prices like a drill program will not displace one.

None of this moves a share price this quarter. Ideon is privately held, and Berkeley Lab is a federal laboratory, so there is no direct listed exposure to the award itself. The broader tape closed the session firm on the day the news carried: the S&P 500 tracker (NYSEARCA: SPY) finished at $765.72, up 0.41%, the Nasdaq 100 fund (NASDAQ: QQQ) at $713.44, up 0.35%, and the Dow tracker (NYSEARCA: DIA) at $532.22, up 0.89%, all as of the 20:00 GMT close on 21 August 2026.

The read-through for investors in the metals complex is slower and structural. Every credible attempt to compress the discovery cycle for critical minerals matters, because the supply response to electrification demand is currently gated by geology and permitting rather than by capital. A imaging tool that lets explorers see density at depth before they drill would not fix permitting. It would, if it works, make the geology part of the problem meaningfully cheaper — and that is the part the market has spent a decade assuming was fixed.

Key facts

• Project lead: Lawrence Berkeley National Laboratory, with Ideon Technologies as partner
• Funder: ARPA-E (US Department of Energy); award value not disclosed
• Technical goal: Path to field-deployable, active-source muon imaging
• Market backdrop: SPY closed at $765.72, +0.41%, as of 21 Aug 2026, 20:00 GMT

Frequently asked questions

What is muon imaging?

Muon imaging, or muon tomography, uses muons — heavy subatomic particles that penetrate rock — to map underground density. Detectors count how many muons arrive from each direction; more mass in the path means fewer muons. The result is a three-dimensional density image of a rock volume, conceptually similar to a medical X-ray but at the scale of an ore body.

What does 'active source' mean in this context?

Existing commercial muon tomography relies on cosmic-ray muons created when cosmic rays hit the atmosphere. They are free but arrive at an uncontrolled rate and direction. An active source generates muons deliberately, which in principle allows shorter survey times, controlled measurement geometry and imaging in orientations that natural downward flux cannot cover.

How much funding did the project receive?

The announcement confirmed that Berkeley Lab and Ideon Technologies received ARPA-E funding for the project but did not disclose the dollar amount or the program timeline. Until ARPA-E or the participants publish those details, the scale and duration of the effort remain unknown.

Why does this matter for critical minerals?

Copper, nickel, cobalt, graphite, rare earths and lithium supply is constrained less by demand than by the long lag between discovery and production. New deposits increasingly sit under barren cover with no surface signature. A tool that images density at depth before drilling could raise drill hit rates and shorten the discovery phase.

Can investors buy shares in the companies involved?

No direct listed exposure exists. Ideon Technologies is privately held, and Lawrence Berkeley National Laboratory is a US federal research laboratory operated for the Department of Energy. Any investment read-through would come later, through miners and explorers that eventually adopt the technology, rather than through the award itself.

Does muon imaging replace drilling?

No. Assays from drill core still determine grade and whether material is ore. Muon imaging maps density contrast, which helps target where to drill and, just as usefully, where not to. Its value is in reducing the number of wasted holes in a program rather than eliminating the drill rig.

Sources

• Berkeley lab-led project secures funding to develop a transportable muon imager — Global Mining Review

Photo: Jimmy Liao · Pexels Licence — source