Higgins, Edwin, 1910, Copper deposits of the Globe-Kelvin districts - III: Engineering and Mining Journal, v. 89, no. 17, p. 870-874.
Engineering and Mining Journal, v. 89, no. 17, p. 870-874.
Mineral District, Porphyry Copper, Mineralization, History, Mining Engineering, Ore, Subsurface,