"Showing the gulch or placer diggings actually worked and districts where quartz (gold & silver) lodges [i.e. lodes] have been discovered to January 1st 1865.", Gulch diggings, quartz lodes, county names, and territory boundary in red., Prime meridians: Greenwich and Washington., Relief shown by hachures., and Yale's copy includes mark of previous owner: B.F. Shumard.