One of the most promising deposits, as regards increased production of vanadium, is at the Shattuck mine, Bisbee, Arizona, where a large vug, or cavity, is lined with a vanadium mineral, probably cuprodescloizite. The ore carries about 8 to 10 per cent. vanadic oxide, in addition to copper and lead. This seems to be one of the best opportunities for an increased production of vanadium in this country. The Golden, Colo., station of the United States Bureau of Mines made a metallurgical study of the treatment of this ore. [Illustration: PLATE V.--Geographical distribution of the vanadium deposits of the world.] The distribution of the vanadium deposits of the world is shown in Plate V. POSITION OF LEADING COMMERCIAL NATIONS The United States is peculiarly fortunate as regards vanadium products, for it is practically the only producer of vanadium in the world, the Peruvian deposits being under the control of an American company. Therefore, England, France, Germany, Japan and other nations are forced to buy of American companies. DEVELOPMENTS AND CHANGES IN KNOWN GEOGRAPHICAL DISTRIBUTION IN THE NEAR FUTURE The larger part of the vanadium that has been used in this country has come from the mines of the American Vanadium Co. in Peru, but the Primos Chemical Co. produced an amount of vanadium from its claims at Newmire, San Miguel County, Colorado, that at least tended to give some real competition to the American Vanadium Co. As already stated, these claims are not nearly as rich or productive as they were, but they are probably good for several years more. The ore from Peru can be counted on probably for several years at something like the present output. The same statement applies to carnotite ore, and it is likely that the production of vanadium from carnotite may increase to some extent, as the demand for radium is strong, and there may be a consequent increase in the treatment of lower-grade carnotite. As this low-grade material usually carries more vanadium, the production of vanadium from this source may increase. Vanadinite may prove to be a source of vanadium, although it is doubtful whether any large quantity can be produced from this mineral. As already stated, cuprodescloizite is probably the best source for an immediate increase in production. As regards foreign countries other than Peru, Russia is the only one likely to produce any appreciable amount of vanadium ores, and undoubtedly no such production will be obtained until industrial conditions are more settled. POLITICAL AND COMMERCIAL CONTROL The American Vanadium Co. holds its mines in Peru through a concession from the Peruvian government. Thus at least two-thirds of the vanadium production of the world is practically in the hands of the Peruvian government, although the company operating is American.