The predecessors of the Denver Mint were the men of Clark, Gruber and Company. During the Pikes Peak Gold Rush, they coined gold dust brought from the gold fields by the miners. In 1858, Austin M. Clark, Milton E. Clark and Emanuel Henry Gruber founded a brokerage firm in Leavenworth, Kansas, and then established an office in Denver at the beginning of the Colorado Gold Rush. Desiring to save on shipping and insurance costs associated with shipping gold back east, the firm opened a private mint. On 25 July 1860, the mint opened in a two-story brick building on the corner of Market and 16th Streets, minting $10 gold pieces at the rate of fifteen or twenty coins a minute. On the face is a representation of the peak, its base surrounded by a forest of timber and 'Pikes Peak Gold' encircling the summit. Immediately under its base is the word 'Denver', and beneath it 'Ten D.'. On the reverse is the American Eagle encircled by the name of the firm 'Clark, Gruber & Co.', and beneath the date, '1860'.: