Extensive Leach Testing Program On Cowboy State Mine

DENVER, CO – American Rare Earths reported on an extensive leach testing program undertaken on Cowboy State Mine ore, part of the Halleck Creek Rare Earths Project in Wyoming. Twenty-five leach tests exploring various parameters and leach methods were completed. The leach tests provide key data for the on-going metallurgical testing and mineral processing flow-sheet development for the Cowboy State Mine Pre-Feasibility Study. The tests represent a significant milestone in the technical de-risking of the project as the results have established the optimal leach conditions and preferred arrangement for the PFS flow-sheet. Test results demonstrate leach parameters which may achieve favorable processing outcomes such as lower energy consumption and front end impurity removal. This is a key step forward in producing rare earth magnet oxides from Halleck Creek ore.

Scoping impurity removal tests, the next step in the mineral processing flow-sheet design for the Pre-Feasibility Study. The completion of the extensive leach testing campaign of Cowboy State Mine ore marks a major milestone for the project. All testing in this current campaign was conducted using sulfuric acid as the lixiviant (leaching agent).