Old Glory Occurrence, Fairhaven District, Northwest Arctic Borough, Alaska, USA
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Geology: A ferruginous gossan in dolomitic marble is developed over a 110 by 500 foot area. The gossan is developed along a marble layer that now contains dolomite, quartz, pyrite (?), sericite, chlorite and minor fuchsite. A composite grab sample of ferruginuous marble collected over a distance of 115 feet contained 0.04 ounces/ton Au, 0.24 ounces/ton Ag, and 0.05 % Zn (Herried, 1966, Table 1). Most of the bedrock in the area is a metasedimentary schist and marble sequence of Lower Paleozoic age (Till and others, 1986).
Workings: Small, hand dug prospecting pits may be present.
Age: Epigenetic mineralization in metamorphic rocks of Seward Peninsula is primarily of Cretaceous age. Some lode gold deposits on southern Seward Peninsula are mid-Cretaceous in age (see Midnight Mountain, BN047).
Alteration: The occurrence is oxidized and the dolomitic marble is replaced by sulfides and phyllosilicates.
Commodities (Major) - Au; (Minor) - Ag, Zn
Development Status: No
Deposit Model: Replacement in marble
Mineral List
6 entries listed. 3 valid minerals.
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References
Herried, G.H., 1966, The geology and geochemistry of the Inmachuk River map area, Seward Peninsula, Alaska: Alaska Division of Mines and Minerals Geological Report 23, 25 p., 1 sheet, scale 1:63,360. 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.