| Reference | {Deposit:: THOMPSON, JAMES V. MINING HISTORY OF POWDERHORN (UNPUB-}{Deposit:: LISHED REPORT), 1980, 7PP.}{Geology:: TEMPLE, A. K. AND R. M. GROGAN. CARBONATITE AND RELATED}{Geology:: ALKALIC ROCKS AT POWDERHORN, COLORADO, ECONOMIC GEOLOGY,}{Geology:: V. 60, 1965, PP. 672-92.}{Reserve-Resource:: WALL STREET JOURNAL. BUTTES SAYS STUDIES ON COLORADO}{Reserve-Resource:: PROSPECT INDICATE MAJOR DEPOSIT OF TITANIUM ORE, FEB 24,}{Reserve-Resource:: 1976, P. 6.}{Reserve-Resource:: TECK CORPORATION 1993 ANNUAL REPORT. P. 19.} |