The USGS has released the magnetotelluric data without interpretation of the Sunnyside porphyry copper system which is part of the concealed San Rafael Valley porphyry system located in the Patagonia Mountains of Arizona. [right, index map showing MT sounding line in black, across phyllite alteration area bounded in red. Credit, USGS]
Ref: Rodriguez, B.D., and Sampson, J.S., 2010, Magnetotelluric survey to characterize the Sunnyside porphyry copper system in the Patagonia Mountains, Arizona: US Geological Survey Open-File Report 2010-1171, 56 p.