Ore deposits in the Chinle and Morrison formations in the Inter-River Region range from about 1 to 3 feet in thickness, and most of the ore is in deposits 1,000 to 25,000 tons in size (a cluster of closely spaced ore bodies joined by weakly mineralized ground is considered to be one deposit). No deposits larger than about 25,000 tons were known as of March 1956.

Carnotite-type secondary uranium minerals and high-valent vanadium minerals are the principal constituents of these deposits and contain minor amounts of copper and vanadium and oxidize to form a wide variety of yellow, orange, green, and blue carbonates, sulfates, phosphates, arsenates, silicates, and hydrated oxides. These deposits also contain uranium disseminated through the rock in the form of uraninite, which is the case with this sample, which contains rich, high grade uraninite in a sandstone matrix.