Geology and ore deposits of the Breckenridge district, Colorado

The Breckenridge district is situated in Summit County, Colo., 60 miles. west-southwest of Denver, near the crest of the Continental Divide, and is drained by Blue River, a tributary of the Grand. Placer mining began here in 1860, but it was not until about 1879 that attention was turned to lode mining. During the last five years gold dredging, after many failures, has become established as an important industry.