ID: 59
rec_id: 59
depname: Bear Lodge
deptype: 10
depage: 50.5±1.2 – 48.8±1.7 – 38.3±0.6 K-Ar, sanidine
json: {"id":"http:\/\/mrdata.usgs.gov\/carbonatite\/record\/59","type":"Feature","geometry":{"type":"Point","coordinates":[-104.45166666667,44.478611111111]},"properties":{"country":"United States","cntrycd":"USWY","stprov":"Wyoming","depname":"Bear Lodge","altname":"Bear Lodge Mts.","latitude":"44.4786111111111","latdeg":44,"latmin":28,"latsec":43,"longitude":"-104.451666666667","londeg":-104,"lonmin":-27,"lonsec":-6,"discdate":"1949","mintype":"s\u00f6vite","oreton":"10.7","deptype":10,"niobium":"0","ree":"3.6","p2o5":"0","grades":"Rare Element Resources (2009) at 1% RE2O3 cutoff grade","depage":"50.5\u00b11.2 \u0096 48.8\u00b11.7 \u0096 38.3\u00b10.6 K-Ar, sanidine","agemy":"49","tectset":"North-American platform, Eocene Black Hills uplift, western end of westerly trended alkaline intrusive belt","rocks":"carbonatite, intrusive breccia, lamprophyre, nepheline syenite, phonolite, syenite, trachyte","rocksmap":"granite (Precambrian), limestone, mudstone, sandstone, shale (Paleozoic\u0096Mesozoic)","orebody_fm":"dike, vein, plug within alkaline intrusive complex 43 sq. km","alttype":"K-feldspar\u0096pyrite, fenitization","altwidth":"0","dep5km":"11d, 25a","comments":"Flanks and depth of estimated resources are open. Early resource evaluations: 76.2 Mt at 1.5% RE2O3 by Gersic and others (1990); 726 Mt at 1.306% RE2O3 and 0.034% ThO2 by Jackson and Christiansen (1993). Oxidized zone to >100 m depth, carbonatite ranges from hairline veinlets to dikes ?30m thick.","mineral":[{"role":"ore","name":"ancylite"},{"role":"ore","name":"apatite"},{"role":"ore","name":"barite"},{"role":"ore","name":"bastnaesite"},{"role":"ore","name":"brookite"},{"role":"ore","name":"chalcopyrite"},{"role":"ore","name":"fe-oxide"},{"role":"ore","name":"fluorite"},{"role":"ore","name":"galena"},{"role":"ore","name":"hematite"},{"role":"ore","name":"magnetite"},{"role":"ore","name":"mn-oxide"},{"role":"ore","name":"monazite"},{"role":"ore","name":"molybdenite"},{"role":"ore","name":"parisite"},{"role":"ore","name":"pyrite"},{"role":"ore","name":"pyrolusite"},{"role":"ore","name":"pyrrhotite"},{"role":"ore","name":"rutile"},{"role":"ore","name":"sphalerite"},{"role":"ore","name":"sphene"},{"role":"ore","name":"strontianite"},{"role":"ore","name":"synchysite"},{"role":"ore","name":"thorianite"},{"role":"ore","name":"uraninite"},{"role":"ore","name":"xenotime"},{"role":"ore","name":"zircon"},{"role":"gangue","name":"aegerine"},{"role":"gangue","name":"biotite"},{"role":"gangue","name":"calcite"},{"role":"gangue","name":"k-feldspar"},{"role":"gangue","name":"quartz"},{"role":"gangue","name":"sanidine"}],"reference":["Bliss. J.D., ed., 1992, Developments in deposit modeling: U.S. Geological Survey Bulletin 2004, 168 p.","Gersic, J., Peterson, E.K., Schreiner, R.A., 1990, Appraisal of selected mineral resources of the Black Hills National Forest, South Dakota and Wyoming\u0097Executive summary: U.S. Bureau of Mines, MLA Series, no. 4-90, 29 p.","Noble, A.C., Clark, J.G., Ranta, D.E., 2009, Technical report on the mineral resources of the Bear Lodge rare-earth project: Rare Element Resources Ltd., 171 p.","Jackson, W.D., and Christiansen, G., 1993, International strategic inventory summary report-\u0096rare-earth oxides: U.S. Geological Survey Circular 930-N, 68 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.","Rare Element Resources Ltd., 2009, Rare Element Reports More than 125% Increase in rare-earth mineral resource at Bear Lodge: 9.8 million-ton inferred mineral resource averaging 4.07% rare-earth oxides: News Release of March 23, 2009, 4 p.,","http:\/\/www.rareelementresources.com\/s\/NewsReleases.asp?ReportID=342327 (last visited June 5, 2009)","Staaz, M.H., 1983, Geology and description of thorium and rare-earth deposits in the southern Bear Lodge Mountains, northeastern Wyoming: U.S. Geological Survey Professional Paper 1049-D, 52 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=59