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Unnamed (west of Walla Walla Creek)

Prospect, Inactive

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Commodities and mineralogy

Main commodities Au; Sb
Ore minerals stibnite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SO
Quadrangle map, 1:63,360-scale C-2
Latitude 64.581
Longitude -162.511
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is in the west side of Walla Walla Creek valley at an approximate elevation of 500 feet. Walla Walla Creek is a drainage on the east side of Darby Peninsula. The prospect is 2 miles west of Mt. Kwiniuk. This is locality 64 of Gamble (1988).

Geologic setting

Geologic description

Exploration workings have been dug on quartz-stibnite veinlets at this locality. This prospecting was first reported by Smith and Eakin (1911) who noted this as a small occurrence with a trace of gold; limonite staining on joints and fractures was identified but no distinct vein or lode was observed. Sampling of dump materials by Miller and Grybeck (1973) confirmed the presence of stibnite (greater than 10,000 ppm Sb) but gold was not detected. The early exploration workings prior to 1909 included a 25-foot-long trench and a 100-foot-long adit (Smith and Eakin, 1911). Bedrock is metasedimentary rocks that include lower Paleozoic calc-schist (Till and others, 1986). The metasedimentary rocks are on the east flank and within 0.4 miles of the Darby pluton but thermal metamorphism has not been described. High angle faults may be important structural elements in this area.
Geologic map unit (-162.513573996496, 64.5802810030222)
Mineral deposit model Quartz-stibnite veinlets? in metasedimentary rocks.
Age of mineralization Not known; probably mid-Cretaceous, the age of the nearby Darby pluton (K/Ar ages for the Darby pluton are 88.3 +/- 1.5 and 92.8 +/- 2.6 Ma, Berry and others, 1976), or younger.
Alteration of deposit Small amounts of limonite staining on joints and fractures was described by Smith and Eakin (1911).

Production and reserves

Workings or exploration The early exploration workings prior to 1909 included a 25-foot-long trench and a 100-foot-long adit (Smith and Eakin, 1911).
Indication of production None

References

MRDS Number 10308309

References

Berry, A.L., Dalrymple, G.B., Lamphere, M.A., and Von Essen, J.C., and others, 1976, Summary of miscellaneous potassium-argon age measurements, U.S. Geological Survey, Menlo Park, California, for the years 1972-1974: U.S. Geological Survey Circular 727, 13 p.
Gamble, B.M., 1988, Non-placer mineral occurrences in the Solomon, Bendeleben, and southern part of the Kotzebue quadrangles, western Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1838-B, 13 p., 1 sheet, scale 1:250,000.
Miller, T.P., and Grybeck, D.J., 1973, Geochemical survey of the eastern Solomon and southeastern Bendeleben quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 73-189, 115 p.
Miller, T.P., Grybeck, D.J., Elliott, R.L., and Hudson, T.L., 1972, Preliminary geologic map of the southeastern Bendeleben and eastern Solomon quadrangles, eastern Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 72-256, 11 p., 1 sheet, scale 1:250,000.
Smith, P.S., and Eakin, H.M., 1911, A geologic reconnaissance in southeastern Seward Peninsula, and the Norton Bay-Nulato region, Alaska: U.S. Geological Survey Bulletin 449, 146 p.
Till, A.B., Dumoulin, J.A., Gamble, B. ., Kaufman, D.S., and Carroll, P.I., 1986, Preliminary geologic map and fossil data, Soloman, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, 10 p., 3 plates, scale 1:250,000.
Reporters Travis L. Hudson (Applied Geology)
Last report date 8/19/1999