 | | Journal (article/letter/editorial) | | containingRare-Earth-Bearing Apatite, Molybdenite,and Magnetiteat Iron Hill, CusterCounty,Colorado* , FRED...HILDEBRAND AND NANCY M. CONKLIN Abstract Rare-earth-bearing apa•ite andmolybdenite werediscovered in...southwestslopeof Iron Hill about 4 miles east-southeast of Silver Cliff, Cust6r County, Colorado. The dike is...percent apatite that contains about4 percentrare-earth elements. The first stagealso containsactinoliteand...corrensiteand calcite. The secondstage,chiefly pyrite, ankerite, and siderite, fills drusy cavities of |  | | Report (issue) | | constantly evolving as man digs and probes the earth. Whenever a quarry is opened or an old one deepened...I Appendix II Appendix III Appendix IV Index Pyrite and marcasite ...................................3) 4) 5) 6) Upper Mississippi Valley zinc—lead district Mineral crystals, isometric ....................pocket) Page 82 83 85 Plates Page Page 4) A. White calcite crystals on brown calcite in vugs in dark...quarry showing clear calcite, brown fluorite and pyrite. 1) A. Pseudomorphs of anglesite after galena |  | | Report (issue) | | 930-M) "Prepared as a cooperative effort among earth-science and mineral-resource agencies of Australia...N65C68 1993 333.8'5465-dc20 92-41231 CIP FOREWORD Earth-science and mineral-resource agencies from several...tantalum---------------------------------------Mining and processing - - - - - - - - - - - - - - - -...- - - - - - - - - - - - - - - - - - - - Niobium mining and processing - - - - - - - - - - - - - - - -...- - - - - - - - - - - - - - - - - - - Tantalum mining and processing- - - - - - - - - - - - - - - - - |  | | Report (volume) | | STATE GEOLOGIST. VOL. II . A REPORT 0:N THE IRON ORES OF MISSOURI FROM FIELD WORK PROSECUTED DURING...geologist, C. R. KEYES, paleontologist. Specialties : Iron and ~JJfangan ese. H. A. WHEELER, ass't geologist...in Zinc and Lead Work. E. H. LONSDALE, ass't in Iron o,·e Work ancl Detailecl fliapping. T. B. MARBUT...Fields. (iv) E. W. NEWTON, Local Assistant in Polk County. LETTER OF TRANSMITTAL. 0FFICI~ OF THE GEOLOGICAL...the honor to transmit, herewith, a Report upon the Iron Ores of Missouri, by Mr. Frank L. Nason, assistant |  | | Journal (article/letter/editorial) | | 3, Terri Lacourse2, Laura K. Pisiak1 School of Earth and Ocean Sciences, University of Victoria, Victoria... BC, Canada 3 current address: Department of Earth Sciences, University of Toronto, Toronto, ON, MA...between magnetite from skarn and NU porphyry deposit settings. The heterogeneous composition of hydrothermal...set ACCEPTED MANUSCRIPT 4 from the Ertsberg deposit (Indonesia) with trace elements determined by electron...from eight deposits in New Mexico and Arizona, PT USA employing LA ICPMS. The latter work showed considerable |  | | Journal (article/letter/editorial) | | 1984, pp. 869-882 Mineralogy and Petrology of Iron Skarnsin Western British Columbia, Canada LAWRENCE...alkalicontentsbut muchhigherNa20/K20 ratios(avg = 2.6). The iron content of intrusions isinverselyproportionalto...associated skarn,suggestinga magmaticcomponentof iron in skarn. Fluid inclusionanalysessuggestthat early...geologyof westernCanada. SKARNdepositswhich are minedfor iron occurin a The presentstudydescribesthe detailed...plutonic-host-rock compositions andgeometries. calcic iron skarns which form in oceanic island-arc As a gr |
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