Part of Rosemont Copper's mitigation parcel at Helvetia, just west of the limestone quarry in the Santa Rita Mountains, on Wednesday, Sept. 4, 2013, near Sonoita, Ariz. Rosemont Copper has committed to buying land parcels and water rights around the valley to compensate for its effects on the land and waterways near its mine site. Photo by Mike Christy / Arizona Daily Star

Mike Christy / Arizona Daily Sta