An 1894 photograph shows the Colorado state militia's camp in the Cripple Creek mining district, where troops were sent to enforce the terms of a union agreement with mine owners for an eight-hour workday. (Courtesy of Denver Public Library Special Collections, Z-2742)After gold was discovered in a high mountain valley southwest of Pikes Peak in 1890, thousands of fortune-seekers flocked to the overnight boomtown of Cripple Creek, along with sat…