The preliminary estimate for the value of non-energy minerals and uranium mined in Colorado in 2008 is $2.155 billion. This represents an 12% increase over the 2007 total of $1.93 billion. The metals sector, including molybdenum, gold, silver, vanadium and the energy mineral uranium, contributed $1.5 billion. Industrial minerals, including sand, gravel, stone, clay, gypsum, cement and nahcolite, were valued at $654 million.
http://www.coloradomining.org/
https://i2mconsultants.com/downloads/corp/NoticeofWithdrawnLink.pdf