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Widstedt No. 1

Prospects, Probably inactive

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Commodities and mineralogy

Main commodities Sb
Other commodities Au
Ore minerals arsenopyrite; jarosite; kermesite; pyrite; stibiconite; stibnite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale NM
Quadrangle map, 1:63,360-scale C-1
Latitude 64.5797
Longitude -165.3914
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Widstedt No. 1 prospect is on the southeast side of Anvil Creek, approximately at the Snake River road crossing. The map location is in the west-central part of section 36, T. 10 S., R. 34 W., Kateel River Meridian. This is locality 48 of Cobb (1972 [MF 463], 1978 [OFR 78-93]) and locality 19 of Hummel (1962 [MF 247]).

Geologic setting

Geologic description

The Widstedt No. 1 (Widstedt tunnel) prospect is in the Anvil Creek fault zone (Mertie, 1918 [B 662-I, p. 430]; Cathcart, 1922, p. 238-239; Hummel, 1962 [MF 247]). At the prospect, graphitic schist is contorted, broken, and commonly stained with jarosite, probably after very fine grained pyrite. Locally a bright yellow mineral and a red mineral are associated with veinlets of stibnite. The yellow and red minerals are herein inferred, respectively, to be stibiconite and kermesite, minerals formed by the oxidation of stibnite. A 70-foot crosscut was driven by J.C. Widstedt in 1899, and several tons of stibnite ore were produced from the workings. Coarsely crystalline stibnite occurred in kidneys enveloped in pyrite and arsenopyrite-bearing schist. Maximum gold assays reportedly exceeded 3 ounces per ton; silver and some copper were also reported. In general, however, the deposit appears to contain little gold.
Geologic map unit (-165.394004461516, 64.5789347909911)
Mineral deposit model Simple Sb deposits (Cox and Singer, 1986; model 27d).
Mineral deposit model number 27d
Age of mineralization Probably mid-Cretaceous or younger; see NM207.
Alteration of deposit Silicification and sulfidization of graphitic schist.

Production and reserves

Workings or exploration The antimony-bearing shear zone was explored by workings as early as 1899; antimony prospecting continued through World War I.
Indication of production Undetermined

References

MRDS Number A012843; A012846

References

Cathcart, S.H., 1922, Metalliferous lodes in southern Seward Peninsula: U.S. Geological Survey Bulletin 722-F, p. 163-261.
Cobb, E.H., 1972, Metallic mineral resources map of the Nome quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-463, 2 sheets, scale 1:250,000.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Nome quadrangle, Alaska: U.S. Geological Survey Open-File report 78-93, 213 p.
Hummel, C.L., 1962, Preliminary geologic map of the Nome C-1 quadrangle, Seward Peninsula, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-247, 1 sheet, scale 1:63,360.
Mertie, J.B., Jr., 1918, Lode mining and prospecting on Seward Peninsula, in Brooks, A.H., and others, Mineral resources of Alaska, report on progress of investigations in 1916: U.S. Geological Survey Bulletin 662, p. 425-449.
Reporters C.C. Hawley and Travis L. Hudson
Last report date 7/10/2000