Airborne Radiometric Maps of Mountain Pass, California

Geophysical investigations of Mountain Pass, California, were conducted as part of an effort to study regional crustal structures as an aid to understanding the geologic framework and mineral resources of the eastern Mojave Desert. The study area encompasses Mountain Pass, which is host to one of the world’s largest rare earth element (REE) carbonatite deposits. The deposit is found along a north-northwest-trending, fault-bounded Paleoproterozoic block that extends along the eastern parts of the Clark Mountain Range, Mescal Range, and Ivanpah Mountains.