American Rare Earths confirms high-grade rare earths at Halleck Creek's Bluegrass and County Line targets

A recent channel sampling campaign conducted by American Rare Earths Ltd has confirmed strong rare earth element mineralisation across the Bluegrass and County Line target areas at the Halleck Creek Rare Earths Project in Wyoming.

Key long-term resource

“This most recent round of channel samples confirm that the Bluegrass area is a key long-term resource area at Halleck Creek,” CEO Chris Gibbs said.  

“While our focus remains on continuing development of the Cowboy State Mine independently, the attractive TREO grades observed at the Bluegrass area could supply rare earths for the next generation.

“At County Line, elevated heavy rare earth levels in dike-hosted mineralisation are particularly encouraging and provide valuable insight as we expand our understanding of the broader Halleck Creek system and prioritise future exploration.”

A total of 82 samples were collected by Wyoming Rare (USA) Inc, a wholly owned subsidiary of American Rare Earths, with technical input from Geosyntec.

The results reveal strong rare earth oxide concentrations, particularly at the Bluegrass target, where samples returned an average of 3,333 parts per million (ppm) of total rare earth oxides (TREO), with a peak assay of 7,112 ppm TREO.

Magnet rare earths prominent

Importantly for the company, magnet rare earth oxides (MREO) represented some 27% of TREO, and heavy rare earth oxides (HREO) made up about 10%.

In contrast, County Line samples showed more geochemical and lithological variability, with average TREO grades of 1,218 ppm in host rocks and 2,246 ppm in dike-hosted samples.

Dike samples also showed signs of higher HREO proportions, reaching up to 20% of total TREO content.

These results highlight a relatively homogeneous TREO distribution at Bluegrass, underpinned by the Red Mountain Pluton lithology, while County Line displays a complex geological setting with medium quartz monzonite dikes contributing to TREO enrichment.

All channel samples were logged, GPS-located and analysed by ALS Global using lithium borate fusion and ICP-MS methods.

Quality control protocols included certified reference materials and duplicates.

Permitting for future drilling at Bluegrass is underway with state and federal agencies, allowing for potential expansion without disrupting the development of the adjacent Cowboy State Mine.