| OCR Text |
Show 34 longer was profitable. During the early part of the period of radium production the vanadium contained in the carnotite ore was not recovered until about 1916, when some byproduct vanadium was reported. By 1923 the carnotite ore had produced 1,116,455 pounds of vanadium or about seven per cent of the world's supply^ 3 With recovery of radium no longer profitable this mining came to a standstill in about 1920, although some mills operated on previously mined carnotite ore until 1923. When mining was resumed by the United States Vanadium Corporation in 1936 it was for vanadium to supplement the Imports from Peru, which were inadequate to supply the increasing demand. The area in Southwestern Colorado is within the boundary of the subject lands and this important region of vanadium-bearing sandstone formations is described in considerable detail in the section of this report beginning on page 39 that explains the methods used and the value found in the appraisal of this area. Rifle Creek Area. The third important vanadium-producing area in the United States is located on Rifle Creek northeast of the town of Rifle, Garfield County, Co^rado. The area is characterized by a single body of vanadium ore of unusual size and is commonly referred to as the ^Hutchinson, .TV. S., Boericke, H., and Hess, F. L., Vanadium in international control of minerals, pp. 151-171,. Am. Inst. Min. Met. Eng., and Min. Met, Soc. America, 1925 |
