12 times background and the <strong>in</strong>dividual radioactive m<strong>in</strong>eral gra<strong>in</strong>s ranged from 0.6 to 7.6 cm (0.25 to 3 <strong>in</strong>) long (Russell and Devore, 1948). K<strong>in</strong>g and Harris (2002) listed this site as an unverified occurrence. The dom<strong>in</strong>ant lithology <strong>in</strong> the area is p<strong>in</strong>k to gray, medium- to coarse-gra<strong>in</strong>ed biotite hornblende quartzofeldspathic gneiss with abundant small, tight folds. Small pockets of biotite granite pegmatite are common with<strong>in</strong> the gneiss and one lens of biotite granite pegmatite (QAP: 20% Q, 60% A, 20% P) conta<strong>in</strong>s allanite with some gra<strong>in</strong>s up to 1.3 cm (0.5 <strong>in</strong>) <strong>in</strong> length (Sample 20121017JC- D). The pegmatite lens is weakly to moderately enriched <strong>in</strong> all of the LREE and some of the HREE as shown <strong>in</strong> table 9. other Precambrian occurrences Beaver Creek Allanite Prospect, Secs. 5 and 6, T. 46 N., R. 83 W. and Sec. 31, T. 47 N., R. 83 W., Western Johnson County At this location <strong>in</strong> the southern Bighorn Mounta<strong>in</strong>s allanite is present <strong>in</strong> lenses, bands, and pods of metamorphic calc-silicate rocks. The rocks are composed of a complex assemblage of calcite, diopside, garnet, sodium-rich amphiboles, epidote, oligoclase, magnetite, and allanite. Allanite occurs as irregular masses that <strong>in</strong>terf<strong>in</strong>ger with epidote (Wilson, 1960). The bodies are generally concordant with the 300° trend<strong>in</strong>g foliation of the host<strong>in</strong>g Precambrian quartzofeldspathic gneiss and form a discont<strong>in</strong>uous zone vary<strong>in</strong>g from several centimeters to 2 m (a few <strong>in</strong>ches to 6 ft) wide and 1,143 m (3,750 ft) long (K<strong>in</strong>g and Harris, 2002). Marble is adjacent to some of the calc-silicate bodies, and allanite tends to be more abundant <strong>in</strong> such areas. Individual allanite crystals are as long as 5 cm (2 <strong>in</strong>) (K<strong>in</strong>g and Harris, 2002). Numerous prospect pits and trenches were cut <strong>in</strong> the site prior to 1960. In 1955, as much as 544 tonnes (600 tons) of allanite-bear<strong>in</strong>g rock were removed from work<strong>in</strong>gs <strong>in</strong> sec. 31 (Bromley, 1955; Sargent, 1960). Assays reported by Wilson (1960) yielded up to 11 percent CeO 2 , 0.7 percent thorium, and 1.5 percent other REO. Access to the Beaver Creek allanite prospect requires passage through private lands, and the WSGS was unable to ga<strong>in</strong> permission to access for this <strong>in</strong>vestigation. union Pass – Warm spr<strong>in</strong>g Area The Union Pass – Warm Spr<strong>in</strong>g area (fig. 10), is located on the north end of the W<strong>in</strong>d River Range, approximately 12 km (7.5 mi) due west of Dubois. The area is known to host placer deposits of gold and heavy m<strong>in</strong>erals, and at least one ve<strong>in</strong>- and breccia-hosted uranium deposit. Ullmer (1983) noted a north-northwest trend<strong>in</strong>g l<strong>in</strong>eament (fig. 10) that <strong>in</strong>tersects the Dubois claims uranium deposit, which is hosted <strong>in</strong> a brecciated quartz ve<strong>in</strong> cutt<strong>in</strong>g a magnetite- and biotite-rich pod with<strong>in</strong> Archean gneiss (Granger and others, 1971; Ullmer, 1983). Uranium m<strong>in</strong>eralization with<strong>in</strong> the Dubois claims was likely produced through hydrothermal alteration related to the emplacement of granitic dikes (Ullmer, 1983). Exposed <strong>in</strong> a road-cut on Wildcat Road near the northwest end of the l<strong>in</strong>eament, and similar to that on the Dubois claims, an iron-rich pod is cut by a biotite granite dike. The pod conta<strong>in</strong>s much less biotite, and is dom<strong>in</strong>antly composed of iron-rich table 9. Concentration of the REE, niobium, tantalum, and thorium <strong>in</strong> the Allie claims pegmatites. Bold values <strong>in</strong>dicate concentrations greater than five times crustal abundance. Element La (ppm) Ce (ppm) Pr (ppm) Allie claims Nd (ppm) Sm (ppm) Eu (ppm) Gd (ppm) Tb (ppm) Dy (ppm) Ho (ppm) 20121017JC-D 66.8 174.5 20.6 85.8 27.4 0.85 16 1.89 7.69 1.1 Element Er (ppm) Tm (ppm) Yb (ppm) Lu (ppm) Sc (ppm) Y (ppm) Cumulative REE (ppm) Nb (ppm) Ta (ppm) Th (ppm) 20121017JC-D 2.67 0.38 2.54 0.39 3.4 29.6 441.6 2.6 0.45 68.7 34
35 figure 10. Sample locations and geology of the Union Pass-Warm Spr<strong>in</strong>g area, modified from Keefer, 1957; Dunnewald, 1958; Rohrer, 1968; Granger and others, 1971; and Ullmer, 1983.
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- Page 29 and 30: Precambrian occurrences Precambrian
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- Page 35 and 36: the Tie Siding pegmatites. The alte
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- Page 39 and 40: lbs) for 1957 and 450 kg (1,000 lbs
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- 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
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- Page 57 and 58: tourmaline, amphibole, spinel, sphe
- Page 59 and 60: Mud creek, nW¼nE¼ sec. 19, t. 44
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- Page 87 and 88: monazite 1, 11, 12, 13, 14, 15, 18,
- Page 89 and 90: strontianite 18, 19 Stump Formation
- Page 91: notes