 | | Journal (article/letter/editorial) | | THE IRON DISTRICT, ORE DEPOSITS OF THE CEBOLLA GUNNISON COUNTY, COLORADO? JosE•,a T. SINGEWALD, JR....southernpart of Gunnison County. It lies about nine miles east of the Lake City branch of the Denver...miles to the north. The occurrenceof titaniferous magnetite in this region has beenknown for someyears,but...the depositin t883, and said of it: "The Cebolla iron deposit is a peculiar formation unto itself. I was...anything like it, or read of anything similar. There is iron enough,over a mile squareof it, apparentlyoverlaid |  | | Report (issue) | | Washington Zinc ore, Friedensville, Pa. Banded iron-formation. Palmer, Mich. 6. Ribbon asbestos ore...Peninsula, Mich. 10. Porphyry molybdenum ore, Colorado 11. Zinc ore, Edwards, N.Y. 12. Manganese nodules...Elements in the Powderhorn District, Gunnison County, Colorado By JERRY C. OLSON and DAVID C. HEDLUND GEOLOGY...elements in the Powderhorn district, Gunnison County, Colorado. (Geology and resources of thorium in the...rocks. 2. Intrusions (Geology)—Colorado—Gunnison Co. 3. Thorium ores—Colorado—Gunnison Co. I. Hedlund, David |  | | Book (edition) | | (Jacupiranga, Brazil). In addition deposits of fluorite, magnetite, vanadium, and vermiculite occur associated with...most of the field work on the Iron Hill complex of Gunnison County, Colorado, in 1912-1913. Although his...accepted the idea of an igneous origin for the Iron Hill carbonatite. In 1924 Bowen, who had visited the...(1919, 1921) considered the calcite of the Laacher Lake Ausfwiirflinge to be magmatic and indeed called...Bildung analog den Pegmatiten.” Chilwa Island in Lake Chilwa, Nyasaland, was first examined geologically |  | | Journal (article/letter/editorial) | | Salt Lake City, Utah 84112 Mineralogy and Petrology of the Iron Hill Carbonatite Complex, Colorado determine...occurring in the Iron Hill carbonatite ciated. For this study I have chosen the Iron complex have been...been examined in order to deter- Hill carbonatite complex, one of the largest mine the genetic link between...alkaline igneous rocks with which they are The Iron Hill carbonatite body, also known ubiquitously associated...pyroxenite, uncom- the small community of Powderhorn, Colorado, pahgrite, ijolite, and nepheline syenite is about |  | | Report (volume) | | Minerals of Colorado: A 100- Year Record By EDWIN B. ECKEL GEOLOGICAL SURVEY BULLETIN 1 1 14 A...knowledge____________________________________ Future of Colorado mineralogy______________________________________...mineral localities and metallic mineral deposits of Colorado ________________________________ In pocket III...mineral localities and metallic mineral deposits of Colorado, has not been included in this reprint. Many of...especially Fischer and others, 1946). MINERALS OF COLORADO: A 100-YEAR RECORD By EDWIN B. EcKEL ABSTRACT |  | | Report (issue) | | Minerals in Powderhorn District, Gunnison County, Colorado By J. C. OLSON and S. R. WALLACE A CONTRIBUTION..._______________________________________________ Carbonate rock of Iron Hill___________________________________ Sedimentary...--------------_-__------Rocks relatedJ;o the Iron Hill composite stock ____________________ Gabbro__"-__...86. Index map of Colorado, showing location of Powderhorn district, Gunnison County, Colo_-__-__--_-_-_----_-_--_...MINERALS IN THE POWDERHORN DISTRICT, GUNNISON COUNTY, COLORADO By JERRY C. OLSON and STEWART R. WALLACE ABSTRACT |  | | Journal (article/letter/editorial) | | carbonatites: chemistry of apatite from Iron Hill, Colorado W. P. NASH Department of Geological and Geophysical...Geophysical Sciences, University of Utah, Salt Lake City, Utah 84112, U.S.A. (Received 28 January 1972;...rocks and carbonatites from the Iron Hill carbonatite complex, Colorado, have been analyzed for major and...alkaline igneous rocks of the Iron Hill carbonatite complex, Powderhorn, Colorado (NASH, 1972a). The mineral...cases constitutes a significant proportion of the magnetite-perovskite ore bodies. In carbonatite, apatite |  | | Report (issue) | | THE RAWLINS, SHIRLEY, AND SEMINOE IRON-ORE DEPOSITS, CARBON COUNTY, WYOMING By T. S. LOVERING INTRODUCTION...INTRODUCTION AND ACKNOWLEDGMENTS For many years iron ore has been known to exist in central Wyoming. As early...survey of the Seminoe iron-ore deposits, the Rawlins paint-rock ores, and the Shirley iron-bearing veins was... The Union Pacific Eailroad Co. and the Colorado Fuel & Iron Co. courteously permitted the writer to...to examine their private reports on the iron districts described in this paper. The help extended by the |  | | Journal (article/letter/editorial) | | 672-692 CARBONATITE AND RELATED ALKALIC POWDERHORN, COLORADO A. K. TEMPLE ROCKS AT AND R. M. GROGAN CONTENTS.................................... Perovskite-magnetite.................................................the alkalicrockcomplex at Powderhorn, Gunnison County,coversapproximately 12 squaremiles. About70 percentis...concentricsuitesof nepheline andmelilite-bearing rocks,magnetite-perovskite concentrations, biotite-rich zones...pyrochlore. Columbium is also contained in the magnetite-perovskiteconcentrationsin the pyroxenite, and |  | | Journal (article/letter/editorial) | | Apatite, Molybdenite,and Magnetiteat Iron Hill, CusterCounty,Colorado* , FRED A. HILDEBRAND AND NANCY M...southwestslopeof Iron Hill about 4 miles east-southeast of Silver Cliff, Cust6r County, Colorado. The dike is...trachyandesiteand the matrix is mainly low-titanium magnetite. There were three stages of mineralization. The...enclosestrachyandesite fragments and consistsmainly of magnetite and about 2« percent apatite that contains about4...brecciadike of uniquemineralogicalcharacterat Iron Hill 4.2 miles east-southeastof Silver Cliff (Fig. |  | | Report (issue) | | setting of the Leadville mining district, Lake County, Colorado by Alan R. Wallace1 Open-File Report 93-343...Government. JDenver, Colorado PREFACE This geologic summary of the Leadville, Colorado, mining district...California Gulch Superfund Site in Leadville, Colorado. Under the agreement, the USGS provides expert............... 6 Figure 4. Vertical section at Iron Hill, showing "contacts" and stacked orebodies ......SETTING OF THE LEADVILLE MINING DISTRICT, LAKE COUNTY, COLORADO By Alan R. Wallace GENERAL SUMMARY The |  | | Report (issue) | | vanadium 50.94 chromium 52.00 manganese 54.94 iron 55.85 cobalt 58.93 nickel 58.69 copper 63.55...deposit; and titaniferous magnetite and ilmenite from the magmatic La Blache iron-titanium-oxide deposit...2007). Synthetic rutile is produced by removing iron from secondary ilmenite feed, which increases its...rock), and older lithified equivalents. Magmatic iron-titanium-oxide-rich deposits are hosted by a complex...Titaniferous magnetite, which is a complex oxide made up primarily of magnetite (Fe3O4) with iron-titanium-oxide |  | | Report (issue) | | _________________ ___. Nevada ___________ Elko County. - ______ ... _ Star mine, Harrison Pass _____... Tuscarora Range _____ _ ._. ________ Humboldt County Golconda manganese-tungsten depositNorth workings...naine________________ Mine near Green Talc mine. _____ Nye County ____ _._-___-________-___ Gabbs area __ _____________________..._____ Brucite and magnesite deposits. __ Pershing County __ Rocks in the West Humboldt Range ..~ Limerick...California Continued Nevada Continued White Pine County.._________________ Cherry Creek district______________ |  | | Journal (article/letter/editorial) | | Article Bayan Obo Controversy: Carbonatites versus Iron Oxide-Cu-Au-(REE-U) Chengyu Wu Rio Tinto Mining...further studies. Keywords: Bayan-Obo, carbonatites, iron-oxide Cu-Au, ore genesis, rare earths. 1. Introduction...resource with estimated reserves of up to 1500 Mt of iron ore (35% wt Fe), 48 Mt REE (6% wt RE2O3) and 1 Mt...member consisting of dolomite marble. Iron occurs mainly as magnetite and hematite, although layered siderite...Fe oxide-Cu-Au-(REE-U) deposits. Bayan Obo’s magnetite–hematite ore bodies contain abundant apatite, |  | | Report (issue) | | ORE DEPOSITS OF TILE LEADVILLE MINING DISTRICT, COLORADO BY S. F. EMMONS, J. D. IRVING, AND G. F. LOUGIILIN...High terrace gravel_ 15 Low terrace gravel_ _ 17 "Lake beds"_ 17 Character and distribu17 tion _ Deformation...fault _ 88 56 011ie Reed pipe_ Iron-Mikado group_ 88 57 Josie pipe _ 89 Iron fault _ 58 Eureka pipe_ Mikado..._94 61 Mike anticline _ Origin of the Iron-Mikado fault 61 Colorado Prince anticline _ group _ 95 61 Mosquito...syncline_ Faults southeast_ of _ Leadville 62 the_ Fryer Hill folds _ 62 district _ 95 Warping and drag along |  | | Report (issue) | | Washington Zinc ore, Friedensville, Pa. Banded iron-formation. Palmer, Mich. 6. Ribbon asbestos ore...Peninsula, Mich. 10. Porphyry molybdenum ore, Colorado 11. Zinc ore, Edwards, N.Y. 12. Manganese nodules...Carbonatite Stock at Iron Hill, Powderhorn District, Gunnison County, Colorado By THEODORE J. ARMBRUSTMACHER...thorium resources of the carbonatite stock at Iron Hill UNITED STATES GOVERNMENT PRINTING OFFICE...carbonatite stock at Iron Hill, Powderhorn District, Gunnison County, Colorado. (Geology and resources |  | | Journal (article/letter/editorial) | | and Geology, University of Nevada, Reno, Nevada, USA Abstract Rare earth elements (REE) have been mined...when placer monazite was produced in the southeast USA. Since the 1960s, however, most North American REE...most other carbonatites. Elsewhere in the western USA, carbonatites have been proposed as possible REE...low-grade LREE resources are in carbonatite in Colorado and Wyoming. Carbonatite complexes in Canada contain...types of hard-rock REE deposits in the USA include small iron-REE deposits in Missouri and New York, |  | | Report (volume) | | ___________________ 65 FIGURE 1. Index map of Colorado, showing location of area described.... 2 2. Two..._--85 PRE-CAMBRIAN ROCKS OF GUNNISON RIVER, COLORADO By J. FEED HUNTER l INTRODUCTION PUBPOSE AND EXTENT...exposed in a long, narrow area in Colorado, which extends from Saguache County west and north through Gunnison...Gunnison and Montrose counties into Delta County. The overlying formations are known and have been carefully...Gunnison down nearly to the mouth of Smiths Fork, along Lake Fork of Gunnison River for more than 13 miles, and |  | | Report (issue) | | SURVEY The carbonatite stock at Iron Hill, Gunnison County, Colorado Chemical and mineralogical data...standards. The carbonatite stock at Iron Hill, Gunnison County, Colorado Chemical and mineralogical data...the carbonatite stock at Iron Hill, near Powderhorn, Gunnison County, Colorado, are presented in this report...(Staatz and others, 1978). The carbonatite stock at Iron Hill is part of an alkaline rock complex (fig. 1) originally...about 30 km , consists chiefly of pyroxenite, magnetite-ilmenite-perovskite segregations, uncompahgrite |  | | Report (volume) | | 779 GUIDES TO ORE IN THE LEADVILLE DISTRICT, COLORADO BY G. F. LOUGHLIN WASHINGTON GOVERNMENT PRINTING...__ Guides available and their significance Breece Hill stock Other siliceous rocks_ _ Veins __________...5. Plan showing Tucson-Maid fault offset by the Iron, Mikado, and R. A. M. faults________________________...m GUIDES TO ORE IN THE LEADVILLE DISTRICT, COLORADO By G. F. LOUGHLIN INTRODUCTION The new report...ore deposits of the Leadville mining district, Colorado, recently completed, is similar in scope to other |  | | 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 |  | Metz, Michael C., Brookins, Douglas G., Rosenberg, P. E., Zartman, R. E. (1985) Geology and geochemistry of the Snowbird Deposit, Mineral County, Montana. Economic Geology, 80 (2) 394-409 doi:10.2113/gsecongeo.80.2.394 | Journal (article/letter/editorial) | | Geologyand Geochemistryof the SnowbirdDeposit, Mineral County, Montana M. C. METZ, GeoTec Services,Inc., 14379...14379 West Ellsworth Avenue, Golden, Colorado 80401 D. G. BROOKINS, Departmentof Geology,University of...hydrothermal"carbonatite"dikesassociated with the Iron Hill carbonatite. Introduction tains additional ...was found in three areas: Irish Basin,Cedar Log Lake, and the Snowbirddeposit Previous work (Fig. 1);...zoningas the upper body, but on a with a coreof iron-bearingcalcite,ankerite,fluorite, and quartzand |  | | Report (volume) | | ............................................. Colorado.................................................deposits of some others, such as clay, coal, and iron ore, are mentioned only in general terms. One material...especially from those of Arkansas, California, Colorado, New Mexico, Oregon, South Dakota, Tennessee,...minerals and rocks, their occurrence and uses: Colorado State Geol. Survey Bull. 6, 1913. 8 USEFUL...Albany. North Carolina_.Dr. Joseph Hyde Pratt, Chapel Hill. North Dakota_.Dr. A. G. Leonard, Grand Forks. Mr |  | | Journal (article/letter/editorial) | | ldbe detectedin amountsaslow as300 ppm. Ferrous iron waspresentin mostdolomiticcarbonatitesamplesand...to sample includingsilicates,phosphates,sulfates,iron oxides, preparation and measurement(Wambeke, 1960)...be dis- Canada;Iron Hill, Powderhorn district, Colorado;and covered. GemPark,Colorado(Fig. 1). Althoughthe...Similarly, the HOH-bending vibration district,Colorado;O -- Oka Carbonatite,Quebec,Canada. mode,coupledwith...1971;Gaffey, Analytical Procedures IH = Iron Hill, Powderhorn district, Colorado; GP = Gem Park 1984). Manyrock-forming |  | | Report (volume) | | The New World or Cooke City mining district, Park County, Mont., by T. S. Levering_____________________...The Rawlins, Shirley, and Seminoe iron-ore deposits, Carbon County, Wyo., by T. S. Lovering*..._____:__...the top of Sheep Mountain, Mont. _ 4. A, Corinnes Lake, a steep-walled tarn near Grasshopper Glacier, Mont...World district.-.. 82 26. Map of Creede district, Colorado, showing principal mines and prospects and mineralized...topography and geology of Bradley Peak area, Carbon County, WyO-____--_-_-__-_--_----_---____ 47. Panorama |
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