306 ECONOMIC GEOLOGY 



In California the Atolia Mining Company, which controls the 

 Atolia field at the north edge of San Bernadino County, increased 

 its production ofscheelite. This company is the largest indi- 

 vidual producer of tungsten ores in the United States. 



A new discovery of scheelite was reported from the west side 

 of Rand Mountains but no ore was sold during 1912. A few 

 tons of mixed scheelite and wolframite were shipped from the 

 vicinity of Nipton in the east end of San Bernadino County. 



In Arizona a few tons of htibnerite were shipped from the dry 

 placers and some ore from the veins near Dragoon. Hlibnerite 

 was shipped also from Arivaca and scheelite from Oracle. Other 

 small shipments were made from Nevada, Idaho, Washington, 

 and New Mexico. 



URANIUM 



The production of uranium oxide for 1912 has been estimated 

 by F. L. Hess as 26 short tons. This would represent approxi- 

 mately 20 tons of metallic uranium. This was a slight increase 

 over the production of 1911. 



The uraniferous ores were all carnotite, a variable compound 

 of uranium and vanadium, from the Jura-Trias formations of 

 the high plateau region of Colorado and Utah. The largest and 

 richest deposits are found in Montrose County, Colorado, in 

 Paradox Valley, Long Park, and the Mclntyre districts. In 

 Utah the carnotite came from Emery and Grand Counties. 



A small amount of uraninite was mined near Central City, 

 Gilpin county, Colorado, and sold as laboratory material. A 

 few pounds partly altered to gummite were mined near Penland, 

 North Carolina. 



VANADIUM 



The larger part of the vanadium ore mined in the United States 

 in 1912 was a sage-green vanadiferous sandstone which contains 

 the vanadium mica, roscoelite. It was mined near Newmire, 

 San Miguel County, Colorado. The vanadium was obtained in 

 the form of an iron vanadate at the local reduction plant of the 

 Primes Chemical Company. The iron vanadate was shipped 

 east to be smelted into ferro-vanadium. The price of metallic 

 vanadium in former years has been from $4 to $5 per pound 



