ID: 56
rec_id: 56
depname: Mountain Pass
deptype: 10
depage: ~1,400
json: {"id":"http:\/\/mrdata.usgs.gov\/carbonatite\/record\/56","type":"Feature","geometry":{"type":"Point","coordinates":[-115.53222222222,35.478611111111]},"properties":{"country":"United States","cntrycd":"USCA","stprov":"California","depname":"Mountain Pass","latitude":"35.4786111111111","latdeg":35,"latmin":28,"latsec":43,"longitude":"-115.532222222222","londeg":-115,"lonmin":-31,"lonsec":-56,"discdate":"1949","startdate":"1952","mintype":"beforsite, Si-carbonatite, s\u00f6vite","oreton":"90","deptype":10,"niobium":"0","ree":"5","p2o5":"0","grades":"Olson and others (1954); Parker (1965); Singer (1998)","depage":"~1,400","agemy":"1400","tectset":"Mojave Paleoproterozoic crystalline block (~1.8\u00961.6 Ga)","rocks":"carbonatite, shonkinite, syenite","rocksmap":"amphibolite, gneiss, granite (Paleoproterozoic)","orebody_fm":"alkali-carbonatite complex","ore_a":"14","ore_area":"58.3","ore_b":"5.3","alttype":"fenitization","altwidth":"0","dep5km":"11d","comments":"20\u009625% barite in ore. Molycorp (2008) started mining in 1952 at average 15% RE2O3 producing till middle 1990s, restarted in 2007. Reserve 1987 estimated 29 Mt at 8.9% RE2O3, at 5% RE2O3 cut-off, current reserves are > 20 Mt at similar grade (Castor, 2008).","mineral":[{"role":"ore","name":"allanite"},{"role":"ore","name":"apatite"},{"role":"ore","name":"azurite\/malachite"},{"role":"ore","name":"barite"},{"role":"ore","name":"bastnaesite"},{"role":"ore","name":"celestite"},{"role":"ore","name":"cerite"},{"role":"ore","name":"chalcopyrite"},{"role":"ore","name":"fluorite"},{"role":"ore","name":"galena"},{"role":"ore","name":"goethite"},{"role":"ore","name":"hematite"},{"role":"ore","name":"magnetite"},{"role":"ore","name":"monazite"},{"role":"ore","name":"parisite"},{"role":"ore","name":"pyrite"},{"role":"ore","name":"sahamalite-(ce)"},{"role":"ore","name":"strontianite"},{"role":"ore","name":"tetrahedrite"},{"role":"ore","name":"thorite"},{"role":"ore","name":"wulfenite"},{"role":"ore","name":"zircon"},{"role":"gangue","name":"aegirine"},{"role":"gangue","name":"amphibole"},{"role":"gangue","name":"ankerite"},{"role":"gangue","name":"augite"},{"role":"gangue","name":"biotite"},{"role":"gangue","name":"calcite"},{"role":"gangue","name":"chlorite"},{"role":"gangue","name":"crocidolite"},{"role":"gangue","name":"dolomite"},{"role":"gangue","name":"epidote"},{"role":"gangue","name":"muscovite"},{"role":"gangue","name":"olivine"},{"role":"gangue","name":"orthoclase"},{"role":"gangue","name":"phlogopite"},{"role":"gangue","name":"quartz"},{"role":"gangue","name":"riebeckite"},{"role":"gangue","name":"siderite"},{"role":"gangue","name":"talc"}],"reference":["http:\/\/www.molycorp.com\/operational_excellence\/rehistory.asp (last visited April 17, 2009)","Castor, S.B., 2008, Rare earth deposits of North America: Resource Geology, v. 58, no. 4, p. 337\u0096347.","Castor, S.B., 2008, The Mountain Pass rare earth carbonatite and associated ultrapotassic rocks, California: The Canadian Mineralogist, v. 46, p. 779\u0096806.","Castor, S.B., and Nason, G.W., 2004, Mountain Pass rare earth deposit, California, in Castor, S.B., Papke, K.G., and Meeuwig, R.O., eds., Betting on industrial minerals, Proceedings of the 39th Forum on the Geology of Industrial Minerals: Nevada Bureau of Mines and Geology Special Publication 33, p. 68\u009681.","Haxel, G.B., 2005, Ultrapotassic mafic dikes and rare earth element- and barium-rich carbonatite at Mountain Pass, Mojave Desert, southern California\u0097Summary and field trip localities: U.S. Geological Survey Open-File Report 2005-1219, 56 p.","Molycorp Minerals, 2008, Molycorp over the years - rare earth operations, 2 p.,","Olson, J.C., Shawe, D.R., Pray, L.C., and Sharp, W.N., 1954, Rare-earth mineral deposits of the Mountain Pass district, San Bernardino County, California: U.S. Geological Survey Professional Paper 261, 75 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.","Parker, J.G., 1965, Rare-earth elements\u0097Mineral and Facts, U.S. Bureau of Mines Bulletin 630, p. 753\u0096768.","Singer, D.A., 1998, Revised grade and tonnage model of carbonatite deposits: U.S. Geological Survey Open-File Report 98-235, 8 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=56