American Rare Earths Moves Ahead with Test Mining at Cowboy State Mine

3 min read | August 18, 2025 03:08 PM AEST | By Team Kalkine Media

Highlights

  • American Rare Earths starts test mining at Cowboy State Mine
  • Program to support future demonstration plant and process optimisation
  • Project positioned as a step toward strengthening US rare earth supply chain

American Rare Earths Ltd (ASX:ARR) has launched test mining activities at its Cowboy State Mine in Wyoming through subsidiary Wyoming Rare (USA) Inc. The move represents a significant milestone in advancing the Halleck Creek Project, which is considered one of the largest rare earth deposits in the United States.

The test mining program is operating under a State of Wyoming License to Explore by Dozing. Material extracted from the site will serve as feedstock for a future demonstration plant. This process also aims to generate samples that can be shared with industry stakeholders while providing valuable data for future planning.

While American Rare Earths is not part of the ASX 200 stocks, the company’s project carries strategic importance for the rare earth supply chain and the wider energy and technology sectors.

Ore Extraction and Processing Focus

The ore extracted will be put to use in several key areas:

  • Metallurgical testing and processing optimisation
  • Stockpiling for a demonstration-scale plant
  • Producing end-product samples for potential commercial partners

The test pit operations will provide critical information on drilling rates, blast fragmentation, and mine design. Weathered material removed during excavation will be returned as backfill once the program concludes, reflecting the company’s commitment to responsible operational practices.

Strategic Significance of the Project

The Cowboy State Mine test mining phase plays an important role in de-risking future development plans. Demonstration plants require a reliable ore supply to validate processing flowsheets and to build confidence with stakeholders. The current program is designed to refine cost models, improve engineering designs, and strengthen discussions with potential offtake partners.

By advancing its Wyoming-based project, American Rare Earths is positioning itself to support US initiatives aimed at reducing reliance on imported rare earth materials. These resources are vital for defence, renewable energy, and high-tech industries.

About American Rare Earths

American Rare Earths is developing the Halleck Creek Project, located on Wyoming state land, which benefits from favourable permitting conditions. The company aims to establish processing and separation facilities onsite, contributing to greater energy and economic security.

Its approach combines environmentally conscious mining with research-backed innovation, further enhancing the long-term prospects of the project.

 

Frequently Asked Questions

  • What is the purpose of the test mining at Cowboy State Mine?
    The test mining is designed to provide ore for a demonstration plant, support process optimisation, and generate product samples for potential partners.
  • How will the extracted ore be used?
    The ore will be used for metallurgical testing, creating stockpiles for future operations, and producing samples for industry stakeholders.
  • Why is the Halleck Creek Project considered significant?
    The project is one of the largest known rare earth deposits in the United States and is strategically positioned to support domestic supply chains critical to technology, defence, and energy sectors.

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