rare earth elements in Wyoming

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figure 6. Tie Siding pegmatites. A, mining pit that exposes the granitic pegmatite with large books of biotite of pegmatite #4. B, alteration zone within pegmatite #3. C, Holiday Place pegmatite, exposed within a mine pit; an allanite nodule is present immediately left of the person. D, close-up of an allanite nodule in the Holiday Place pegmatite. suggest that the source of the radioactivity is zircon hosted within the biotite. However, a sample of biotite (Sample 20121107JC-E) associated with high radioactivity is not itself radioactive and contains very little zircon. Radioactivity associated with several large biotite seams exhibits significant variability along the seam, suggesting that the source of the radioactivity is not disseminated uniformly throughout the seam. Most of the high REE concentrations in the Tie Siding pegmatites are associated with alteration zones on the margins of the pegmatites. However, the highest concentration of REE is found in large, 30 to 60 cm (1- to 2-ft) diameter allanite nodules within alkali feldspar. 24 Pegmatite #1, Sec. 35, T. 13 N., R. 72 W. and NE¼NW¼ sec. 2, T. 12 N., R. 72. W., Southern Albany County Outcrops in this area are dominated by pink, very coarse-grained to pegmatitic epidote pyroxene monzonite of the Sherman Granite, with moderate to abundant magnetite, and moderate hematite and limonite staining (Sample 20121107JC- A). This monzonite is enriched in all of the REE, as well as yttrium and niobium (table 6). Smith (1954) identified pyrochlore in this pegmatite and reported a sample with 4.1 3 percent ThO , 0.35 percent cU O ,1.23 2 3 8 percent eU O . He also noted radioactiv- 3 8 ity up to 900 times background and a vitreous radioactive mineral (Smith, 1953a). Subsequent workers were unable to locate this pegmatite (Griffin and Warner, 1982) and the reported location in sec. 35, T. 13 N., R. 72 W. (Smith, 1953a; 1954) is probably incorrect. However, a biotite alkali feldspar granite to granite pegmatite is exposed in a group of small prospect pits in the SE¼NW¼ sec. 2, T. 12 N., R. 72 W., to the south of the location cited by Smith (1953a; 1954). Feldspars in the pegmatite exhibit graphic texture and a zone of feldspar to clay alteration (fig. 6) is associated with radioactivity up to eight times background (380 counts per minute [cpm] with background of 50 cpm). When isolated, a sample of this material (Sample 3 Uranium concentrations are sometimes denoted by cU 3 O 8 or cU, which represent assay values as determined by laboratory chemical analysis. The more frequently used denotation eU 3 O 8 , is a value representing radiometric equivalent U 3 O 8 , as estimated from gamma ray measurements. Together, cU 3 O 8 and eU 3 O 8 can then be used to determine the disequilibium of a uranium deposit. As uranium decays naturally, the resulting daughter products are often radioactive as well. That radioactivity can affect gamma ray logging measurements and may lead to a falsely higher estimation of uranium concentration in that deposit, and would be referred to as being in disequilibrium.
table 6. Concentration of the REE, niobium, uranium, and thorium in the Tie Siding pegmatites. Bold values indicate concentrations greater than five times crustal abundance. Element La (ppm) Ce (ppm) Pr (ppm) Tie Siding pegmatites Nd (ppm) Sm (ppm) Eu (ppm) Gd (ppm) Tb (ppm) Dy (ppm) Ho (ppm) 20121107JC-A 76.4 154.5 20.5 82.1 16.65 4.88 16.05 2.46 14.1 2.82 20121107JC-B 2110 4670 384 1185 122.5 6.1 58.8 7.44 36.2 7.33 20121107JC-C 56.2 105.5 10.4 32.7 4.34 0.75 2.96 0.45 2.6 0.53 20121107JC-D 9.7 14.1 3 13.4 4.87 0.33 7.38 1.59 11.6 2.73 20121107JC-E 27 32 5.2 20.8 5.3
Page 1 and 2: are earth elements in Wyoming Wayne
Page 3: Rare Earth Elements in Wyoming Wyom
Page 6 and 7: Deacon’s Prayer Group Claims . .
Page 9 and 10: AbstrAct Rare earth elements (REE)
Page 11 and 12: Wyo-DOG is a multi-tiered applicati
Page 13 and 14: neodymium-145 through electron capt
Page 15 and 16: ability and economic factors, inclu
Page 17 and 18: Gosen, Foley, and Cordier, 2010). T
Page 19 and 20: Extraction of rEE Aside from genera
Page 21 and 22: diorites, and their associated pegm
Page 23 and 24: REE deposit in Wyoming and is curre
Page 25 and 26: 17 figure 1. Locations of samples c
Page 27 and 28: accessory aegirine, apatite, stront
Page 29 and 30: Precambrian occurrences Precambrian
Page 31: 23 figure 5. Sample locations and g
Page 35 and 36: the Tie Siding pegmatites. The alte
Page 37 and 38: coarse-grained granite (QAP: 30% Q,
Page 39 and 40: lbs) for 1957 and 450 kg (1,000 lbs
Page 41 and 42: granite to granodiorite with rapaki
Page 43 and 44: 35 figure 10. Sample locations and
Page 45 and 46: table 10. Concentration of the REE,
Page 47 and 48: tertiary-aged Igneous occurrences L
Page 49 and 50: downstream from older REE mineral c
Page 51 and 52: 43 figure 15. Locations of 1952 USB
Page 53 and 54: samples 20110824WS-C and 20110824WS
Page 55 and 56: Samples of the Flathead were collec
Page 57 and 58: tourmaline, amphibole, spinel, sphe
Page 59 and 60: Mud creek, nW¼nE¼ sec. 19, t. 44
Page 61 and 62: figure 20. Sample locations and geo
Page 63 and 64: interaction between oxidized ground
Page 65 and 66: distinct horizons (plus one unit wi
Page 67 and 68: figure 22. Sample locations and lit
Page 69 and 70: 1977; Love, 1984). REE concentratio
Page 71 and 72: figure 26. Dahllite concretions fro
Page 73 and 74: Moonstone Formation Reefs, SW¼SE¼
Page 75 and 76: EfErEncEs Adams, J.W., Arengi, J.T.
Page 77 and 78: logical Survey of Wyoming [Wyoming
Page 79 and 80: Love, J.D., 1964, Uraniferous phosp
Page 81 and 82: Saywell, T., 2011, Molycorp’s Mou
Page 83 and 84:
IndEx A Abandoned Mine Lands 2 acmi
Page 85 and 86:
f fergusonite 12, 13, 33 Ferris Mou
Page 87 and 88:
monazite 1, 11, 12, 13, 14, 15, 18,
Page 89 and 90:
strontianite 18, 19 Stump Formation
Page 91:
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