Walk this trail with FSPR docent Richard Bauer to visit Millville, location of two historic silver mills, and an adjacent Indian petroglyph site. The tour will focus on the history of mining and the mills which were active during the Tombstone silver boom. This is about a 2 mile walk on an uneven dirt and gravel trail that crosses through a deep wash. Please realistically assess your ability to do this walk. There is no shade, and it will be hot on sunny days. Wear a hat, sun protection, appropriate clothing, and sturdy shoes.  Bring water and snacks. Meet at the Millville and Petroglyph Discovery Trail parking area. This trailhead is located 7.5miles east of Sierra Vista on Charleston Road. This is not the parking area right by the river: look for the fire danger level sign on the north side of Charleston Road at the entrance to the parking lot, about .5 miles east of the river. Meet by the vault toilet. This location is searchable as “Millville and Petroglyph Discovery Trail” in Google Maps.   For more information, call (520)508-4445 or email fspr@sanpedroriver.org. Hosted by the Friends of the San Pedro River.