sentences:  Woolsey used stones from decimating prehistoric ruin to build his ranch house, built an irrigation system off the Agua Fria (probably part of a prehistoric system), and introduced some of the first cattle into newly organized Yavapai County (1864).At the "falls" of the Agua Fria at present Humboldt, Woolsey built a small quartz mill to work gold ores from the nearby hills and a small water-powered grist mill.During 1864, he led the storied Woolsey Expeditions to the east in retaliatory raids on Apache and in search of gold; all failed to find a new Eldorado.