A German named Henry Wickenburg was one of the first prospectors. His efforts were rewarded with the discovery of the Vulture Mine, from which more than $30 million worth of gold has been dug.
Ranchers and farmers soon built homes along the fertile plain of the Hassayampa River. Together with the miners, they founded the town of Wickenburg in 1863. Wickenburg was also the home of Jack Swilling, who prospected in the Salt River Valley in 1867. Swilling conducted irrigation efforts in that area and helped ground the city of Phoenix, Arizona.
As the town grew, conflicts developed with the Yavapai Native American tribe, who rejected a treaty signed by their chiefs. When the American Civil War began in 1861, the Federal troops were all withdrawn and the settlements were left unprotected.
Wickenburg area with much of the Southwest became part of the United States by the 1848 treaty that ended the Mexican-American War. The first extensive survey was conducted by Gila Rangers who were pursuing hostile Indians who had raided the Butterfield Overland Mail route and attacked miners at Gila City.
In 1862, a gold strike on the Colorado River near present-day Yuma brought American prospectors, who searched for minerals throughout central Arizona. Many of the geographic landmarks now bear the names of these pioneers, including the Weaver Mountains, named after mountain man Pauline Weaver, and Peeples Valley, named after a settler.
Information was gathered from wikipedia.. click here WIKI to see information from source.