A new wave of ASX-listed explorers is converging on California’s Mojave Desert, circling one of the world’s most strategic mineral deposits as the United States sharpens its efforts to secure domestic supplies of rare earths and other critical minerals.
Dateline Resources, Great Northern Minerals, Locksley Resources, and Bayan Mining and Minerals have all staked ground in the Mountain Pass district, centred around MP Materials’ world-class operation — the only rare earths-producing mine in the US and a cornerstone of Washington’s push to reduce reliance on Chinese supply chains.
For these juniors, the appeal is clear: geology that mirrors one of the world’s highest-grade rare earth deposits, a policy environment more favourable to domestic mining than at any point in decades, and surging demand from defence, clean energy, and technology sectors.
Dateline lights up new REE targets at Colosseum
Dateline Resources Ltd (ASX:DTR) has emerged as a frontrunner with promising survey results at its Colosseum gold and rare earths project, located about 10 kilometres north of Mountain Pass. A recent 3D magnetotelluric survey identified anomalies consistent with carbonatite intrusions — the same rock type that hosts Mountain Pass.
Chief executive Stephen Baghdadi said the discovery of a deep, high-resistivity feature beneath fenite outcrops was “particularly noteworthy,” as it aligns with a carbonatite-related system. The anomaly, dubbed 2200N, lies in previously untested ground and is now the focus of an upcoming drilling campaign.
While Colosseum already hosts a 1.1-million-ounce gold resource, the potential for a rare earths discovery has sparked investor interest. The project also gained visibility earlier this year when US President Donald Trump highlighted its strategic location on social media.
Great Northern pivots to US growth
Great Northern Minerals Ltd (ASX:GNM) has made a decisive pivot from gold exploration in Australia to critical minerals in the US, acquiring the Catalyst Ridge project in the Mountain Pass district earlier this month. The project comprises 119 federal claims adjacent to MP Materials’ ground.
Backed by a recent $2.6 million capital raise, Great Northern is undertaking early-stage exploration, including rock chip and soil sampling. General manager of US projects Scott Downsborough said the move signalled a foundational step in the company’s new direction, citing the strong government and corporate investment MP Materials has received for its work in the district — including a $400 million Pentagon package and $500 million from Apple for local rare earth recycling infrastructure.
Read more: Great Northern Minerals pivots to US critical minerals with acquisition of Catalyst Ridge Project
Locksley targets antimony and REEs with US partners
Locksley Resources Ltd (ASX:LKY, OTCQB:LKYRF) is taking a dual-track approach at its Mojave Project, combining rare earth exploration with a focus on antimony — a metalloid designated as critical by the US government for its role in defence, batteries and flame retardants.
The project includes the historic Desert Antimony Mine, one of the highest-grade occurrences recorded in the US.
Read more: Locksley Resources targets US critical minerals demand as it expands targets at Mojave Project
To accelerate development, Locksley has partnered with GreenMet, a Washington-based advisory firm led by former senior officials from the White House, Department of Energy and Pentagon.
The collaboration is aimed at accessing nearly US$1 billion in federal funding earmarked for critical minerals. Locksley is also working with Rice University on downstream processing technology to build a fully domestic antimony supply chain — potentially the first of its kind in America.
Chairman Nathan Lude said the GreenMet partnership “significantly enhances our ability to access US government and institutional support while further validating Mojave as a critical US project for defence, technology, and energy markets.”
Bayan sets foundations at Desert Star
Bayan Mining and Minerals Ltd (ASX:BMM) has planted its flag just 4.5 kilometres from Mountain Pass with its Desert Star project, covering 72 federal lode claims. The company is conducting early-stage reconnaissance, including rock chip sampling and geophysical reviews, but has yet to release assay results.
Bayan also holds the nearby Desert Star North project, with further exploration planned. Executive Director Fadi Diab in July described the Desert Star acquisitions as “a significant milestone” for the company, noting the projects’ positioning in “one of the world’s most prospective rare earth districts.”
Rare earths and US policy alignment
The resurgence of interest in the Mojave Desert reflects more than just favourable geology. The US has made critical minerals a national security priority, leveraging the Inflation Reduction Act and the Defense Production Act to incentivise domestic supply chains.
Read more: Rare earths supply chain builds momentum with federal backing, project milestones
Rare earths, antimony, and related minerals are central to both military technology and the clean energy transition. With Washington signalling openness to fast-tracking projects and funding both exploration and downstream processing, the cluster of ASX juniors in California is aligning itself with US strategic priorities at a pivotal time.
For now, the projects remain in early stages. But taken together, Dateline, Great Northern, Locksley, and Bayan represent a new Australian contingent in America’s only rare earths district — a strategic frontier that could define the next chapter of the critical minerals story.