The Millesani Claim was a mining claim located on the slopes of Grand Teton, Wyoming during the Wild West era. Founded during the 1858 silver rush, the claim was profitable until the Coinage Act of 1873 established the gold standard and caused silver to become less profitable. The claim was abandoned by the late 1870s, and it was later utilized by the O'Driscoll Boys as a hideout during the 1890s.
