Down in the southern reaches of Joshua Tree National Park are Porcupine Wash and the Ruby Lee Millsite.
History
The Park Service says the mill dates back to the 1870s. They probably know something I don't. I could only find evidence that the mill site dates from the Depression Era of the 1930s, when many people were out in the desert looking for gold and trying to make a living. Ruby Lee Rule claimed the mine and mill in March 1936. By 1948, it was owned by A. Dietemann. Production from the mine is unknown, but it is unlikely it was very much.
