Montana Mineral Locality Index Downloaded by [University of Nebraska, Lincoln] at 20:00 09 April 2015...2015 K NOWN AS THE TREASURE STATE, Montana is rich in mineral and gemstone localities. The state motto...Plata meaning “gold and silver,” and the state seal with its representation of mining tools clearly proclaim...proclaim Montana’s mining origins. Montana’s production of copper, coal, gold, lead, manganese, phosphate...phosphate, silver, talc, vermiculite, and zinc is impressive. The official state fossil is Maiasaura peeblesorum |