 Sieber was fired from his San Carlos Chief of Scouts position in December 1890 by Major John L. Bullis.He left San Carlos and took up prospecting until 1898.On February 19, 1907, Sieber was leading an Apache work crew that was building the Tonto road to the new Roosevelt Dam site on the [confluence of the Salt River and Tonto Creek on the border of Gila County and Maricopa County] in Gila County.