U.S. Geological Survey; E.M. Douglas, Geographer; Frank Tweedy, in charge of section; topography by Pearson Chapman; triangulation by Frank Tweedy.
Contour interval 50 feet.
"Surveyed in 1904. Edition of May 1906. Approximate mean declination 1904. Engraved Feb. 1906 by U.S.G.S."
Shows mining activity.