Annex Number 1

Prospect in Alaska, United States with commodities Silver, Gold, Tin, Zinc

Geologic information

Identification information

Deposit ID 10308249
Record type Site
Current site name Annex Number 1

Geographic coordinates

Geographic coordinates: -136.26213, 59.38974 (WGS84)
Relative position This prospect is located in the cliffs on the west side of Porcupine Creek approximately 0.7 miles up Porcupine Creek from its junction with McKinley Creek. It is identified as 'Annex Number 1' in Still and others (1991).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Tin Secondary
Zinc Secondary

Materials information

Materials Type of material
Pyrite Ore
Quartz Gangue

Alteration

  • (Local) 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.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Nearby scientific data

(1) -136.26213, 59.38974

Comments on the geologic information

  • Geologic Description = 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.
  • Age = Unknown, but probably Cretaceous or younger based on age of intrusives in area (MacKevett and others, 1974).

Economic information

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Probably inactive

Mining district

District name Juneau (Skagway subdistrict)

Comments on the workings information

  • Workings / Exploration = This prospect was discovered by Jerry Fabrizio, a local prospector, in 1983 (Still and others, 1991).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF SK043

Bibliographic references

  • Deposit

    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.

  • Deposit

    Wright, C.W., 1904, The Porcupine district, Alaska: U.S. Geological Survey Bulletin 236, 35 p.

  • Deposit

    Eakin, H.M., 1919, The Porcupine gold placer district, Alaska: U.S. Geological Survey Bulletin 699, 29 p.

  • Deposit

    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.

  • Deposit

    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.

  • Deposit

    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.

  • Deposit

    Eakin, H.M., 1918, Gold placer mining in the Porcupine district: U.S. Geological Survey Bulletin 662-B, p. 93-100.

Comments on the references

  • Primary Reference = Still and others, 1991

General comments

Subject category Comment text
Deposit Model Name = There is little information, but the brief description by Still and others (1991) mentions polymetallic veins in dikes (Cox and Singer, 1986; model 22c).

Reporter information

Type Date Name Affiliation Comment
Reporter 04-FEB-01 T.C. Crafford T. Crafford & Associates