The Phillips mill site is located in the Ambrosia Lake Valley about 25 miles north of Grants, New Mexico.

The Phillips mill site is located in the Ambrosia Lake Valley about 25 miles north of Grants, New Mexico. It is one of two uranium mills that were operated in the valley. A total of five mills were built between December 1956 and December 1959 in the Ambrosia Lake district of the uranium mining area known as the Grants mineral belt, which extends from near Albuquerque, New Mexico, westward for about 100 miles across the southern margin of the San Juan Basin.