Green Valley District which is underlain by Payson Ophiolite that includes volcanics, sheeted dike swarms, diorite, gabbro, and tonalite. This lies on a basement complex of granitic rocks that include felsic volcanics and volcaniclastic rocks. The Green Valley District is highly fractured and faulted with fissures with auriferous quartz veins. High grade, free milling gold was initially mined above the water table.
The Zulu claims property is underlain by diorite intruded by granite porphyry dikes. Gold is reported to be found in quartz veins on the property ranging in value from 0.02 opt to 5.94 opt. The main vein strikes northwest for 4,000 feet but may extend further. It is 15 feet wide bordered by walls of altered granite. Numerous smaller veins of varying size occur on the property that reportedly all are gold-bearing.