A man participates in a contest probably at a Colorado Mining Association conference in Denver, Colorado. Shows men in the back of a truck with a hammer, a spike, and a block of possibly stone. The truck has a sign that reads: "[?]er Co. Metal...
A man drives a spike into a rock with a hammer as part of a contest, probably at a Colorado Mining Association convention in Denver, Colorado. Shows the men in the back of a truck and spectators. Signs on the wall read: "Produce More Metals,"...
View of the Colorado Mining Association convention parade as it passes spectators near Glenarm and 16th (Sixteenth) Streets in downtown Denver, Colorado. A flatbed truck carries a miniature model of a mining mill. Shows people, storefronts, the...
Men pose at night by a truck in (probably) Colorado Springs (El Paso County), Colorado; lettering reads: "American Fluorspar Corp. Colo. Springs. Colo. PUC C-11420." Ore pours from a hopper.