Unnamed (near Salmon River) (ARDF #JU254) Nb, Th, Zr

Unnamed (near Salmon River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Nb; Th; Zr
Other commodities	REE (Ce; La; Nd; Pr; Y)

Geographic location

Quadrangle map, 1:250,000-scale	JU
Quadrangle map, 1:63,360-scale	A-2
Latitude	58.0671
Longitude	-134.4585
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is at an elevation of approximately 1,600 feet, 4.5 miles southeast of Eagle Peak, 3.5 miles south of Young Lake, and 3 miles west of the Salmon River. It is in the SE1/4 section 9, T. 44 S., R. 67 E. of the Copper River Meridian. The location is accurate within 1/4 mile.

Geologic setting

Geologic description This prospect consists of pegmatite veins in granite, migmatite, and contact-metamorphic rocks. X-ray spectroscopic analysis of heavy mineral concentrates from samples of the pegmatite veins indicate the presence of yttrium, zirconium, niobium, thorium, lanthanum, cerium, praseodymium and neodymium (Lathram and others, 1965). Wells and others (1986) show active claims at this site in 1985. The rocks in the general area are Upper Jurassic to mid-Cretaceous, marine argillite and graywacke, interbedded with andesitic to basaltic volcanic and volcaniclastic rocks, and subordinate polymictic conglomerate. The rocks are intruded by Cretaceous plutons, including granodiorite, quartz diorite, dunite, and peridotite (Gehrels and Berg, 1994).
Geologic map unit	(-134.460267669185, 58.0667649188695)

Geologic description

This prospect consists of pegmatite veins in granite, migmatite, and contact-metamorphic rocks. X-ray spectroscopic analysis of heavy mineral concentrates from samples of the pegmatite veins indicate the presence of yttrium, zirconium, niobium, thorium, lanthanum, cerium, praseodymium and neodymium (Lathram and others, 1965). Wells and others (1986) show active claims at this site in 1985.

The rocks in the general area are Upper Jurassic to mid-Cretaceous, marine argillite and graywacke, interbedded with andesitic to basaltic volcanic and volcaniclastic rocks, and subordinate polymictic conglomerate. The rocks are intruded by Cretaceous plutons, including granodiorite, quartz diorite, dunite, and peridotite (Gehrels and Berg, 1994).

Geologic map unit

(-134.460267669185, 58.0667649188695)

Production and reserves

Workings or exploration	Surface sampling only.
Indication of production	None

References

MRDS Number	A012082
References Gehrels, G.E., and Berg, H.C., 1994, Geology of southeastern Alaska, in Plafker, George, and Berg, H. C., eds., The geology of Alaska: Geological Society of America, DNAG, The geology of North America, Vol. G-1, p. 451-467. Lathram, E.H., Pomeroy, J.S., Berg, H.C., and Loney, R.A., 1965, Reconnaissance geology of Admiralty Island, Alaska: U.S. Geological Survey Bulletin 1181-R, p. R1-R48. Wells, D.E., Pittman, T.L., Brew, D.A. and Douglass, S.L., 1986, Map and description of the mineral deposits in the Juneau, Taku River, Atlin, and part of the Skagway quadrangles, Alaska: U.S. Geological Survey Open-File Report 85-717, 332 p., 1 sheet, scale 1:250,000.
Reporters	J.C. Barnett and L.D. Miller (Juneau, Alaska )
Last report date	12/15/2001