In the 1870s, the mountain we know as Black Mountain was known as Mormon Boy Mountain.  An old prospector named Sweeney, along with his dependable burro Martha, found gold on a knoll, on the southwest side of Mormon Boy Mountain. When contemplating a name for his new gold mine, Sweeny felt Mormon Boy Mountain should have a girl friend; so, the famous Mormon Girl Mine was born.  An accurate replica of the mine’s entrance may be found at the Museum.