It was the lure of precious metals that brought the largest influx of settlers into the area. Glen Canyon experienced a number of gold rushes beginning in the early 1890s which had an effect on the Henrys. Lumber for the mining camps and for the Stanton Dredge was cut at many places in the mountains, and roads to reach the stands of timber were built up Bull Creek, where a sawmill was also built. Naturally, some of this activity led to other activities in the mountains. In 1890 Jack Sumner, who had been with Powell in 1869, located the Bromide Mine near the summit of Mount Ellen. Prospects seemed good, and by 1893 more than 100 men were reported to be working in the area. A small town called Eagle City was established at Crescent Creek, at the foot of the mountains, with homes, a hotel, two saloons, a dance hall, three stores, and a post office. The Denver and Rio Grande Western Railway made preliminary surveys for a branch line from Green River, Utah, to Eagle City. However, by 1900 the pocket had played out and Eagle City was a ghost town. Other mines were begun on Mount Hillers, and a number of prospects were developed on the eastern slopes of Mount Pennell by Edwin T. Wolverton, beginning around the turn of the century. Wolverton build a stamping mill there in 1921, but none of the mines proved of any worth, and today there is no active gold mining in the Henrys.