John Iliff recognized the demand for beef in Colorado's gold prospecting and mining settlements and built up a huge herd of 26,000 cattle on 16,000 acres by 1870
John Iliff's ranching business was successful as he fattened his cows on grasslands and drove them short distances to mining towns where they fetched full price
Challenges faced by the cattle industry included the Civil War, Plains Indians attacks, rustling, conflicts with settlers and farmers, and cattle diseases like Texas fever