Two men outside a rustic log cabin in Illinois Gulch, east of Breckenridge, Colorado. One man fishes from a log bridge while the other man pans for gold near the cabin entrance. Smoke from the Colorado and Southern (C&S) railroad locomotive is visible on Rocky Point above. Circa early 1900s.

Core sampling in Summit Gulch prior to dredging the Swan River for gold. Circa 1895, near Breckenridge, Colorado. Two men operate the boiler while another man pans for gold in a wooden water flume. Piles of logs are stacked on the ground.

Mary Marks pans for gold in the lower Blue River valley. She wears a fitted bodice with full-length sleeves puffed at the shoulder and a long, full skirt. Her wide-brimmed hat is tilted back on her head. In the background is a view of tree-covered hills and mountains.

Katherine (Kate) Schwalbach, Mary Marks' sister, pans for gold in the lower Blue River valley. She wears a patterned bodice with voluminous, puffy sleeves over a long dark skirt, and a fedora-style hat sits high on her head. In the background is a view of tree-covered hills and mountains.