Rooster Hill Project
The Rooster Hill Project near Sheridan in north-central Wyoming is an advanced, historically drilled monazite-hosted rare earth element (REE) system with extensive historical data compiled to JORC 2012 standards, providing a strong technical foundation for future work.
Historical (non-JORC) estimate: 18 Mt at 1.25 kg/t monazite, including 612 kt at 6.6 kg/t.
High-grade REE surface assays up to 6,815.8 ppm, with elevated Thorium and Uranium.
Heavy mineral concentrates up to 38.3% ilmenite, 8.7% monazite, 4.0% magnetite and 0.2% zircon.
Rooster Hill geological review
Rooster Hill has been explored since 1952, when 92 shallow US Bureau of Mines drill holes defined a historical (non-JORC) estimate of 18 Mt at 1.25 kg/t monazite, including 612 kt at 6.6 kg/t. A 2011 Wyoming State Geological Survey program returned strongly anomalous REE assays (up to 6,815.8 ppm), confirming REE-rich, monazite-dominated mineralisation.
REE distribution: Most REEs hosted in monazite (plus minor apatite/zircon), dominated by Ce, La and Nd, with lesser Gd, Sc, Sm, Pr, Y and Yb.
Source rocks: REE minerals derived from Archean basement and concentrated in the basal heavy mineral assemblage.
