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Class X Inventoq, Colon yo's Collom Mine Project 13 <br />along the Fortieth Parallel in 1868 for the Pacific Railroad Survey (Goetzmann 1966), and geologist <br />Ferdinand Hayden passed through the region and along the Yampa River on his 1877 exploration <br />of Wyoming and Idaho Territories (Hayden 1879). Exploration for precious minerals and coal <br />followed, which continued throughout the late nineteenth century, and coal mining developed into <br />the principal extractive industry in the region. Railroads constructed through western Colorado after <br />1880 fostered homesteading and ranching throughout the region in the late 1800s and early 1900s. <br />Ranching and coal production continued to be important economic pursuits to the present day. <br />Historic periods used to discuss historic sites, events, and National Register of Historic Places <br />(NRHP) eligibility recommendations include: Territorial Period (1861 to 1876, actually begins with <br />the gold rush in 1859); Early Statehood (1876 - 1890); Expansion -era, 1890- 1920); Depression -era <br />(1920 - 1939); World War II -era (1940 - 1945). <br />The Territorial Period is largely associated with the initial gold rush and early homesteading under <br />the 1862 Homestead Act. During Early Statehood, precious mineral discoveries continued through <br />the remainder of the nineteenth century, homesteading increased under expanded homestead acts, <br />and railroads and large irrigation projects werebuilt that fostered continued settlement and economic <br />expansion. Homesteading continued to increase, railroad construction penetrated northwestern <br />Colorado, and non - precious mineral production increased during the Expansion -era. The <br />Depression -era witnessed a general post -World War I economic slump, including the coal industry, <br />and a failure of many homesteads. During the World War II -era, gold mining was shut down and <br />mining of industrial minerals increased; livestock, wool, and agricultural production increased <br />proportionately to meet the demands of the war effort, and new military installations were created <br />and existing locations enlarged (Athearn 1976). <br />47599 TRC Mariah Associates Inc. <br />