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      "title" : "The collection document"
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    "depname" : "Iron Hill",
    "deptype" : 10,
    "depage" : "570",
    "json" : "{\"id\":\"http:\\/\\/mrdata.usgs.gov\\/carbonatite\\/record\\/57\",\"type\":\"Feature\",\"geometry\":{\"type\":\"Point\",\"coordinates\":[-106.70861111111,38.234722222222]},\"properties\":{\"country\":\"United States\",\"cntrycd\":\"USCO\",\"stprov\":\"Colorado\",\"depname\":\"Iron Hill\",\"altname\":\"Powderhorn\",\"latitude\":\"38.2347222222222\",\"latdeg\":38,\"latmin\":14,\"latsec\":5,\"longitude\":\"-106.708611111111\",\"londeg\":-106,\"lonmin\":-42,\"lonsec\":-31,\"discdate\":\"1880s\",\"mintype\":\"beforsite\",\"oreton\":\"655.6\",\"deptype\":10,\"niobium\":\"0.057\",\"ree\":\"0.397\",\"p2o5\":\"0\",\"grades\":\"Staatz and others (1979); Jackson and Christiansen (1993)\",\"depage\":\"570\",\"agemy\":\"570\",\"tectset\":\"Plateau Colorado\\u0097separated part of North-American platform\",\"rocks\":\"carbonatite, ijolite, nepheline syenite, pyroxenite, uncompahgrite, diabase dike\",\"rocksmap\":\"gneiss, granite, metamorphic rocks (Paleoproterozoic)\",\"orebody_fm\":\"carbonatite stock included in pear-shaped magmatic complex, 31 sq. km\",\"ore_a\":\"3.5\",\"ore_area\":\"4.1\",\"ore_b\":\"1.5\",\"alttype\":\"fenitization\",\"altwidth\":\"0\",\"dep5km\":\"Ti in ultramafic rocks\",\"comments\":\"0.0043% ThO2 in ore (Staatz and others,1979). 1958 reserve of 36.3 Mt at 0.25% Nb2O5 was substantionally increased by underground work and additional drilling (Temple and Grogan,1965). Perovskite-rich pyroxenite mineable reserves 1994, by Teck Resources, 44.6 Mt at 13.2 % TiO2; possible resource 1.6 billion tonnes at 10.9%  TiO2 (Van Gosen, 2009). Metamorphism of country rocks at ~1.7 Ga.\",\"mineral\":[{\"role\":\"ore\",\"name\":\"apatite\"},{\"role\":\"ore\",\"name\":\"barite\"},{\"role\":\"ore\",\"name\":\"bastnaesite\"},{\"role\":\"ore\",\"name\":\"fluorite\"},{\"role\":\"ore\",\"name\":\"ilmenite\"},{\"role\":\"ore\",\"name\":\"leucoxene\"},{\"role\":\"ore\",\"name\":\"magnetite\"},{\"role\":\"ore\",\"name\":\"monazite\"},{\"role\":\"ore\",\"name\":\"perovskite\"},{\"role\":\"ore\",\"name\":\"pyrochlore\"},{\"role\":\"ore\",\"name\":\"rabdophane\"},{\"role\":\"ore\",\"name\":\"rutile\"},{\"role\":\"ore\",\"name\":\"synchysite\"},{\"role\":\"ore\",\"name\":\"thorite\"},{\"role\":\"ore\",\"name\":\"titanite\"},{\"role\":\"ore\",\"name\":\"zircon\"},{\"role\":\"gangue\",\"name\":\"biotite\"},{\"role\":\"gangue\",\"name\":\"calcite\"},{\"role\":\"gangue\",\"name\":\"diopside\"},{\"role\":\"gangue\",\"name\":\"dolomite\"},{\"role\":\"gangue\",\"name\":\"na-amphibole\"},{\"role\":\"gangue\",\"name\":\"phlogopite\"},{\"role\":\"gangue\",\"name\":\"siderite\"},{\"role\":\"gangue\",\"name\":\"vermiculite\"}],\"reference\":[\"Jackson, W.D., and Christiansen, G., 1993, International strategic inventory summary report-\\u0096rare-earth oxides: U.S. Geological Survey Circular 930-N, 68 p.\",\"Olson, J.C., and Hedlund, D.C., 1981, Alkalic rocks and resources of thorium and associated elements in the powderhorn district, Gunnison county, Colorado: U.S. Geological Survey Professional Paper 1049-C, 34 p.\",\"Orris, G.J., and Grauch, R.I., 2002, Rare earth element mines, deposits, and occurrences: U.S. Geological Survey Open-File Report 02-189, 174 p.\",\"Singer, D.A., 1998, Revised grade and tonnage model of carbonatite deposits: U.S. Geological Survey Open-File Report 98-235, 8 p.\",\"Staatz, M.H., Armbrustmacher, T.J., Olson, J.C., Brownfield, I.K., Brock, M.R., Lemons, J.F., Jr., Coppa, L.V., and Clingan, B.V., 1979, Principal thorium resources in the United States: U.S. Geological Survey Circular 805, 42 p.\",\"Temple, A.K., and Grogan, R.M., 1965, Carbonatite and related alkalic rocks at Powderhorn, Colorado: Economic Geology, v. 60, p. 672\\u0096692.\",\"Van Gosen, B.S., and Lowers, H.A., 2009, Iron Hill (Powderhorn) carbonatite complex, Gunnison county, Colorado\\u0097A potential source of several uncommon mineral resources: Mining Engineering, v. 59, no. 10, p. 56\\u009662.\",\"Van Gosen, B.S., 2009, The Iron Hill (Powderhorn) carbonatite complex, Gunnison county, Colorado\\u0096a potential sourceof several uncommon mineral resources: U.S. Geological Survey Open-File Report 02-189, 28 p.\",\"Woolley, A.R., 1987, Alkaline rocks and carbonatites of the world, Part 1\\u0097North and South America: London, British Museum (Natural History), 216 p.\"]}}",
    "url" : "https://mrdata.usgs.gov/carbonatite/show-carbonatite.php?rec_id=57"
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}