"The Uravan mineral belt was defined by the U.S.
Geological Survey in 1952 as an elongated area in
southwestern Colorado where uranium-vanadium deposits in the
Salt Wash Member of the Morrison Formation "generally have
closer spacing, larger size, and higher grade than those in
adjacent areas and the region as a whole." William L.
Chenoweth, "The Uranium-Vanadium Deposits of the Uravan
Mineral Belt and Adjacent Area, Colorado and Utah," in New
Mexico Geological Society Guidebook, 32nd Field Conference,
Western Slope Colorado, (Grand Junction, 1981), 165. This
mineral belt includes the Gateway, Uravan, Bull canyon,
Gypsum Valley, and Slick Rock mining districts, all of which
are situated in southwestern Colorado, near the Utah border.
Calamity Mesa lies within the boundaries of the Gateway
district."
aus Godfrey, Lisa P. (1991). Mining the Colorado Plateau: the Story of Calamity Mesa 1910-1970. Thesis Utah State University via
https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=5500&context=etdGateway Mining District via the diggings.com -> Karte mit den claims, die dem dsitrict zugerechnet werden: die Südgrenze ist die County-Grenze Mesa Co und Montrose Co