McKinley Creek Falls

Prospect in Alaska, United States with commodities Gold, Zinc

Geologic information

Identification information

Deposit ID 10308250
Record type Site
Current site name McKinley Creek Falls

Geographic coordinates

Geographic coordinates: -136.23213, 59.36974 (WGS84)
Relative position This prospect is at an elevation of approximately 1,600 feet near the base of a falls in the steep-walled canyon of McKinley Creek . It is on the eastern edge of the NE1/4, section 12, T. 29 S., R. 54 E. of the Copper River Meridian. It is shown as location 20 by Still and others (1991).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Zinc Primary

Materials information

Materials Type of material
Gold Ore
Sphalerite Ore
Quartz Gangue

Alteration

  • (Local) Silica-carbonate units which are cut by or parallel the quartz-sulfide veins are probably altered mafic dikes (Still and others, 1991). Questionable mariposite may be due to alteration of mafic minerals (Bundtzen and Clautice, 1986).

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46
Model code 72
USGS model code 19a
Deposit model name Polymetallic replacement
Mark3 model number 47

Nearby scientific data

(1) -136.23213, 59.36974

Comments on the geologic information

  • Geologic Description = The rocks in the area consist of slate with interbedded limestone that is cut by altered, tan dikes. Narrow, discontinuous quartz-sphalerite veins or silicified bands are in the dikes and, to a lesser extent, in the slate and limestone. Selected high-grade samples of quartz-sphalerite veins in dikes, contained up to 13.4% zinc and 8.9 ppm gold. A 2.5-foot-long chip sample across a limy silicified band in limy slate contained 24.8 ppm gold and 280 ppm zinc (Gilbert and others, 1991; Still and others, 1991). This prospect is similar to the Golden Eagle prospect (SK047). It occurs within a 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) and is considered to be the source of placer gold in this area.
  • 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)

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF SK046

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

    Gilbert, W.G., Still, J.C., Burns, L.E., Wier, K.R., and Redman, E.C., 1991, Geochemistry of Haines-Klukwan-Porcupine area, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 91-5, 1 sheet, scale 1:63,360, 75 p.

  • Deposit

    Still, J.C., 1991, Bureau of Mines mineral investigations in the Juneau mining district, Alaska, 1984 - 1988, v. 2, Detailed mine, prospect, and mineral occurrence descriptions, section A, Haines-Klukwan-Porcupine subarea: U.S. Bureau of Mines of Mines Special Publication, 214 p.

  • 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) who refer to polymetallic veins in dikes and replacement mineralization in adjacent limy sediments (Cox and Singer, 1986; models 22c and 19a).

Reporter information

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