Annex Number 1 Prospect, Skagway District, Juneau District, Haines Borough, Alaska, USA
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Geology: The following description is from Still and others (1991). Pyrite-bearing quartz veins are associated with tan to gray altered dikes. Samples of narrow, discontinuous veins in the margins of dikes and in slate contain from 0.2 to 114.1 ppm gold. Samples of dike and slate contain from 0.005 ppm to 0.315 ppm gold. Selected high-grade (vein?) samples also contain up to 9 ppm silver, 840 ppm zinc, 100 ppm tin, and 0.8% arsenic. These quartz-sulfide veins occur within the northwest-trending zone of quartz-sulfide veining in sediments and slates in the Skagway B-4 quadrangle that is described by Wright (1904 [B 225 and B 236], Eakin (1918 and 1919), and MacKevett and others (1974). Other similar occurrences in the area include the McKinley Falls (SK046) and Golden Eagle (SK047) prospects, and the unnamed zone of veining near the mouth of Cahoon Creek (SK042). This prospect may be within the zone of veining referred to in SK042.
Workings: This prospect was discovered by Jerry Fabrizio, a local prospector, in 1983 (Still and others, 1991).
Age: Unknown, but probably Cretaceous or younger based on age of intrusives in area (MacKevett and others, 1974).
Alteration: Based on similarity to the Golden Eagle (SK047) and other prospects in the area, the tan to gray altered dikes are probably mafic dikes that have been altered to silica-carbonate rock.
Commodities (Major) - Ag, Au; (Minor) - Sn, Zn
Development Status: None
Deposit Model: There is little information, but the brief description by Still and others (19
Mineral List
2 entries listed. 2 valid minerals.
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References
Eakin, H.M., 1918, Gold placer mining in the Porcupine district: U.S. Geological Survey Bulletin 662-B, p. 93-100. Eakin, H.M., 1919, The Porcupine gold placer district, Alaska: U.S. Geological Survey Bulletin 699, 29 p. Gilbert, W.G., and Redman, E.C., 1989, Lode deposits, prospects, and occurrences of the Porcupine mining area, southeast Alaska: U.S. Bureau of Mines Open-File Report 17-89, 1 sheet, scale 1:39,600. MacKevett, E.M., Jr., Robertson, E.C., and Winkler, G.R., 1974, Geology of the Skagway B-3 and B-4 quadrangles, southern Alaska: U.S. Geological Survey Professional Paper 832, 33 p., 1 plate. Still, J.C., Hoekzema, R.B., Bundtzen, T.K., Gilbert, W.G., Wier, K.R., Burns, L.E., and Fechner, S.A., 1991, Economic geology of Haines-Klukwan-Porcupine area, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 91-4, 156 p., 5 sheets, scale 1:63,360. Wright, C.W., 1904, The Porcupine placer district, Alaska: U.S. Geological Survey Bulletin 236, 35 p. Wright, C.W., 1904, The Porcupine placer mining district, Alaska in Emmons, S.F., and Hayes, C.W., eds., Contributions to economic geology 1903: U.S. Geological Survey Bulletin 225, p. 60-63.
