Grants, New Mexico
The Morrison Formation contains uranium deposits, including the Jackpile uranium body discovered near Grants, New Mexico in 1951. The ore deposits in the rich Grants mineral belt are concentrated in sandstone beds of the Westwater Canyon Member and the Jackpile Member. Mines in this belt produced of U3O8 between 1948 and 2002. The uranium was precipitated by plant debris and humate that acted as reducing agents.