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0.0 Bell Ranch northeast of Mayer, Arizona. Proceed on dirt road down the Agua Fria River.

0.9 Road leaves valley bottom and climbs to the south through metasedimentary rocks.

1.3 Road from the Binghampton and Copper Queen mines joins this road on the left.

2.7 Crossing small cattleguard.

3.1 View in the distance at 9:00 to 10:00 shows drill pad used by Billiton to explore the Copper Mountain area. Drill pad is now used as a quarry for mining of hematite-stained metarhyolite.

3.7 Road makes sharp turns around small hills. Visible in the distance at 12:00 are high peaks in the southern Bradshaw Mountains near Horsethief Basin.

4.0 Road crests small ridge. High peak in the far distance at 12:00 to 12:15 is Brady Butte, elev. 6,400 ft (fig. 53). The peak and the ridge extending to the south are composed of the 1750±10 Ma Brady Butte Granodiorite, the oldest dated rock in Arizona (Anderson and others, 1971). The pluton intrudes metavolcanic rocks similar to those seen between Prescott and Mayer, and has been deformed and recrystallized during regional metamorphism (Blacet, 1966; DeWitt, in press; Blacet, 1985). Unconformably overlying the pluton is the Texas Gulch Formation (fig. 43), a sequence of metamorphosed volcaniclastic and sedimentary material that has been multiple deformed (O'Hara and others, 1978; Karlstrom and O'Hara, 1984; Karlstrom and Conway, 1986) at the northern margin of the pluton.

Also visible from this location at about 12:00, directly over the town of Mayer and the smelter stack, are the

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