Graphite (natural) (carbon, C):

Most graphite in Wyoming occurs in Precambrian metamorphic rocks as graphitic schists in relatively thin (1–2 feet thick) veins or as discontinuous lenses containing 20–50 percent graphite, although many contain less than 20%. A minor amount of graphite was mined in 1926, suggesting additional future mineable potential. Information can be found in the WGSS publication Graphite in Wyoming.

Also see: 

• Graphite: Western States Mining and Milling Co

• Vaughn Graphite

• Rabbit Creek Graphite

• Geologic Map of the Area Adjacent to the Rabbit Creek Graphite Mine

• Preliminary Report on the Rabbit Creek Graphite Deposit, Platte County, Wyoming