instance, a single Spodumene crystal from the Etta Mine near Keystone on the east side of the Mount Rushmore...production of minerals, principally Gold, Silver, Copper, Iron, Lead, Manganese and Zinc, along with lesser amounts...beds, excavations, etc.Selenite roses. BRULE COUNTY AREA: in the Oacoma zone of the Pierre Fm. On Elm...gray Barite rosette up to 5 or 6 inches. CAMPBELL COUNTY MOUND CITY, W to the Missouri R., regional hillsides...gravels, etc.petrified wood, wood opal. CORSON COUNTY LITTLE EAGLE: area ridges, slopes, stream beds |