ID: 57
rec_id: 57
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