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SRP contracted SWCA Environmental Consultants (SWCA) to conduct a Class III cultural resources survey along a 15.1-mile-long stretch of the Goldfield-Silver King 230-kilovolt (kV) and Browning to Silver King 500-kV electrical transmission line right-of-way (ROW) in Pinal County, Arizona. The purpose of the survey was to identify cultural resources that are listed in or eligible for listing in the National Register of Historic Places (NRHP) so that SRP can take the necessary measures to avoid or minimize impacts to them during future operations and maintenance activities, and to assist the TNF in its management of cultural resources on the lands that it administers.

15 mi of Extra High Voltage transmission line corridor, 2 mi of access road, and 0.9 mi of 115kV transmission line from the Silverking Substation were surveyed for archaeological resources by the Museum of Northern Arizona in April, 1978. Twelve prehistoric and historic Anglo-American affiliation archaeological sites were identified along the EHV corridor between the Silverking Substation and the Tonto National Forest boundary. An isolated recent feature, not given a site designation, was found on the proposed access road alignment. No sites were found on the 115kV alignment. The report describes the survey and its results and makes detailed archaeological clearance recommendations for the surveyed impact areas. Archaeological clearance is recommended for all surveyed areas except for the actual areas of the 12 recorded sites in the EHV corridor.

The Museum of Northern Arizona investigated four sites along the Silver King to Kyrene, East End, Transmission System. NA15,693 is the remains of a portion of the Magma Arizona Railroad Company narrow gauge line and associated features. The line was used between 1915 and 1923 to haul freight, passengers, and mail between Superior and Webster (Magma Junction). NA15,718 includes the remains of several Salado field houses and associated agricultural features. The site occupants practiced a mixed agricultural and gathering economy. NA15,721 is the remains of a prehistoric hunting and gathering campsite. No structural remains were present. The artifacts consisted almost exclusively of chipped stone. NA15,722 is the remains of a Salado field house and several check dams. The site had an agricultural economy supplemented with some gathering activities. In addition to a discussion of each site investigated in detail, the entire project, including sites recorded during the survey, is discussed in both a local or project specific context and a regional context.