About 20 miles up the Gila River from Yuma, the community of Dome basks in the desert sun. It’s pretty quiet around here these days—a far cry from that prosperous time in the late 1850s when the boisterous boom town of Gila City boasted some thousand rough and tumble prospectors. It was Arizona’s first gold strike, and the town set the style for other mining camps over the next few years.