| Reference | {Geology:: PARKER, R.L., W.N. SHARP. MAFIC-ULTRAMAFIC IGNEOUS ROCKS}{Geology:: AND ASSOCIATED CARBONATITES OF THE GEM PARK COMPLEX,}{Geology:: USGS PAPER 649, 1970, PP. 1-23}{Production:: THOMPSON, J.V. PRELIMINARY ECONOMIC AND TECHNICAL STUDIES}{Production:: OF THE POWDERHORN COLUMBIUM DEPOSITS. PREPARED FOR}{Production:: BUTTES GAS AND OIL CO. BY KAISER ENGINEERS, OCT. 1969.}{Production:: MINING MAGAZINE. ARAXA NIOBIUM MINE, FEB. 1982, PP. 134-147.}{Production:: E&MJ. ST. LAWRENCE COLUMBIUM PROJECT STARTS PRODUCTION IN}{Production:: QUEBEC, OCT. 1961, PP. 99-104.}{Production:: BISS, R. PYROCHLORE BENEFICIATION AT NIOBEC CONCENTRATOR,}{Production:: QUEBEC, CANADA, LES SERVICES T.M.G. INC., 1981, PP.}{Production:: 1-19.}{Reserve-Resource:: RIVERA, R. COCA MINES, INC. DENVER, CO., PERSONAL}{Reserve-Resource:: COMMUNICATIONS AND FIELD VISIT IN NOV. 1982.}{Workings:: LAMARRE, A.L. GEM PARK PROJECT 1008 FINAL REPORT, JAN. 13,}{Workings:: 1976, COMPANY REPORT- COCA MINES, PP. 1-18.} |