Take a tour of Millville, the location of several historic silver mills and a once thriving town, as well as an adjacent Indian rock art site, with FSPR docent Richard Bauer. 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. There is no shade, and it will be hot on sunny days. Please realistically assess your ability to do this walk. Wear a hat, sun protection, appropriate clothing, and sturdy shoes, and bring water and a snack.

Meet at the Millville and Petroglyph Discovery Trail parking area. This trailhead is located 7.5 miles east of Sierra Vista on Charleston Road. This is no the parking area right by the river. Look for the "Fire Danger Level" sign on the north side of Charleston Rd. at the entrance to the parking lot, about 0.5 miles east of the river. Meet by the vault toilet. This location is searchable as "Millville and Petroglyph Discovery Trail" in Goggle Maps.  Admission is free. Donations gratefully accepted
Info: (520) 508-4445, http://www.sanpedroriver.org/wpfspr/.