Take a tour of Millville, an historic silver mill, and an adjacent Indian rock art site. The tour will focus on the history of mining and this mill, part of 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 Parking Area about .25 miles east of the San Pedro River, on the north side of Charleston Road. Look for a fire warning sign at the entrance.