Ann: Change of Director's Interest Notice, page-4

"The elevation of the Colosseum project, situated at approximately 6,000 feet (1,830 meters) above sea level, influences its geological characteristics in several ways, particularly in comparison to the nearby Mountain Pass mine, which is at 5,000 feet (1,500 meters).

Geological Implications of Elevation

1. Exposure of Geological Features: The higher elevation at Colosseum may expose different geological formations and structures compared to Mountain Pass. This can lead to the discovery of previously unknown outcrops and mineralization patterns. Recent field investigations have identified multiple outcrops of fenites and trachytes within the granitic gneiss, suggesting a complex geological history that could indicate the presence of underlying carbonatite bodies similar to those at Mountain Pass.
2. Hydrological Factors: Higher elevations typically experience different hydrological conditions, including reduced precipitation and increased evaporation rates. This can affect the weathering processes of the rocks and the formation of mineral deposits. The Colosseum area's elevation may result in less weathering of the surface materials, potentially preserving more of the original geological features that are crucial for REE exploration.
3. Temperature and Pressure Conditions: The elevation can also influence the temperature and pressure conditions under which the rocks were formed. At higher elevations, the geological processes may differ, affecting the mineralization styles and types of minerals present. The granitic gneiss at Colosseum, for instance, may have formed under different conditions compared to the carbonatite at Mountain Pass, leading to variations in mineral composition and distribution.
4. Potential for Carbonatite Discovery: The elevation difference might indicate that the REE-bearing carbonatite bodies at Colosseum are situated deeper than those at Mountain Pass. This could mean that exploration efforts may need to focus on deeper drilling to uncover these potential deposits, as the surface expressions may not be as evident at higher elevations.

Summary

In summary, the elevation of the Colosseum project affects its geological characteristics by influencing the exposure of geological features, hydrological conditions, temperature and pressure during rock formation, and the potential for discovering carbonatite deposits. These factors are crucial for guiding exploration strategies and understanding the mineralization potential of the area."

https://archive.epa.gov/epawaste/nonhaz/industrial/special/web/pdf/goldch3.pdf