Prospect in Alaska, United States with commodities Gold, Barium-Barite, Copper, Lead, Zinc, Iron

Geologic information

Identification information

Deposit ID 10003505
MRDS ID A106263
Record type Site
Current site name Whistler

Geographic coordinates

Geographic coordinates: -152.64278, 61.96949 (WGS84)
Relative position Alaska Department of Natural Resources claim records show this prospect area located on a low ridge approximately 3 miles west-northwest of the confluence of Protage Creek and the Skwentna River in Sections 19 and 30, T. 22 N., R 18 W. Location is accurate to within 500 feet.
(click for info)

Geographic areas

Country State
United States Alaska


Commodity Importance
Gold Primary
Barium-Barite Primary
Copper Primary
Lead Primary
Zinc Primary
Iron Secondary

Comments on the commodity information

  • Gangue = Carbonate

Materials information

Materials Type of material
Barite Ore
Chalcopyrite Ore
Galena Ore
Gold Ore
Pyrite Ore
Sphalerite Ore
Chlorite Gangue
Magnetite Gangue
Quartz Gangue


  • (Local) Carbonate, sericite, clay and silica. Zonation from propylitic to sericitic to silicic observed in one area.

Host and associated rocks

  • Host or associated Host
    Stratigraphic age (oldest) Late Jurassic

Nearby scientific data

(1) -152.64278, 61.96949

Comments on the geologic information

  • Geologic Description = At this locality fine-grained feldspar-hornblende porphyritic hypabyssal andesite intrudes undifferentiated sedimentary rocks of the Mesozoic Kahiltna terrane and/or the Tertiary Matanuska Formation. Mineralization, contained within the intrusive rocks, includes stockwork chalcopyrite-quartz-magnetite with elevated gold values; vein and joint controlled sulfide-barite-silica mineralization; and chalcopyrite with minor sphalerite in silcified andesite. The prospect is defined by a 500 foot by 800 foot, circular magnetic high (Cominco American Incorporated, unpublished reports, 1987-1990). Bundtzen and others (1989) reported a large, low-grade gold and base metal resource with a 300 foot drill intercept of 0.22% copper and 0.033 oz/ton gold. Unknown age. Tertiary(?) or possibly Cretaceous.
  • Age = Unknown age but cut Tertiary or possibly Cretaceous host rocks.
  • Age = Host rock is Tertiary - Cretaceous.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Both metallic and non-metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Yentna

Comments on the workings information

  • Workings / Exploration = Exploration work included: silt sampling, mapping, rock chip geochemical sampling, grid soil sampling, grid VLF, magnetic and IP geophysical surveys, and diamond drilling (Cominco American Incorporated, unpublished reports, 1987-1990).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A106263
USGS Alaska Resource Data File ARDF TY022

Bibliographic references

  • Deposit

    Reed, B.L., and Nelson, S.W., 1980, Geologic map of the Talkeetna quadrangle: U.S. Geological Survey Miscellaneous Investigations Map I-1174, scale 1:250,000.

  • Deposit

    Bundtzen, T.K., Swainbank, R.C., Deagen, J.R., Moore, J.L., 1990 , Alaska's Mineral Industry 1989: Alaska Division of Geological & Geophysical Surveys, Special Report 44, 100 p.

  • Deposit

    Reed, B.L., and Elliott, R.L., 1970, Reconnaissance geologic map, analyses of bedrock and stream sediment samples, and an aeromagnetic map of parts of the southern Alaska Range: U.S. Geological Survey Open-file Report 70-271, 24 p., 4 sheets, scale 1:250,000.

Comments on the references

  • Primary Reference = Reed and Elliott, 1970; Bundtzen and others, 1989

General comments

Subject category Comment text
Deposit Model Name = Gold-copper porphyry system(?) or feeder to a volcanogenic system(?)
Deposit Other Comments = Volcanic lithologies may be same age as the volcanic rocks mapped by Reed and Nelson (1980) in the Long Lake Hills to the northeast.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1998 Madelyn A. Millholland Millholland & Associates