Frozen Creek

Prospect in Alaska, United States with commodities Gold, Copper, Silver

Geologic information

Identification information

Deposit ID 10307782
Record type Site
Current site name Frozen Creek

Geographic coordinates

Geographic coordinates: -154.51597, 63.53149 (WGS84)
Relative position The Frozen Creek prospect is situated on a south rim of an east-facing cirque valley on the east side of the Mystery Mountains at an elevation of 2,500 feet (762 m) in Section 6, T. 23 S., R. 22 E., of the Kateel River Meridian. Prospect is known to within 250 feet (76 m).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Copper Primary
Silver Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Pyrrhotite Ore
Magnetite Gangue
Tourmaline Gangue

Alteration

  • (Local) Sericite and secondary biotite in pluton.

Mineral occurrence model information

Model code 78
USGS model code 20c
Deposit model name Porphyry Cu-Au
Mark3 model number 34

Nearby scientific data

(1) -154.51597, 63.53149

Comments on the geologic information

  • Geologic Description = The Frozen Creek prospect consists of a large zone of boron metasomatism in the eastern edge of the Mystery Mountains Pluton. It is the eastern-most porphyry-like prospect in a seven mile (11 km) long northeast-trending zone of similar prospects that cut across the central Mystery Mountains. The Frozen Creek prospect is inferred to be Late Cretaceous based on isotopic age of Mystery Mountains intrusive complex (Moll and others, 1981). A strong copper-gold soil anomaly was detected at Frozen Creek (DiMarchi and others, 1997), which is part of the core of Cu-Au anomalies that are surrounded by a lead-zinc mineral zonation. Disseminated chalcopyrite and pyrrhotite are found throughout a tourmaline-enriched monzonitic plutonic rocks; little mineralization is noted in host biotite hornfels. Malachite is locally abundant in hairline fractures in small intrusive bodies. The mineralized zone at Frozen Creek is at least 1,500 feet (457 m) in diameter. Two grab samples of mineralization collected by Clautice and others (1993) averaged 585 ppm copper and 2.1 ppm silver.
  • Age = the Frozen Creek prospect is inferred to be Late Cretaceous based on isotopic age of Mystery Mountains intrusive complex (Moll and others, 1981).

Economic information

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Active

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = The Frozen Creek prospect was found during regional exploration conducted by WGM Inc. in 1977 (Andrews, 1978). ACNC worked on the prospect from 1988 to 1990, and ASA Inc. continued work through 1997 (DiMarchi and others, 1997). During 1989-1991, American Copper and Nickel Inc. explored the area as a porphyry copper-gold target. ASA Inc. continued exploration work with the same target in mind during 1995 and 1996. Two grab samples reported by Clautice and others (1993) averaged 585 ppm copper and 2.1 ppm silver.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF MD032

Bibliographic references

  • Deposit

    Andrews, Tom, 1978, Summary of Progress, Doyon Project, Mystery Mountains, (Block 10): Anchorage, Alaska, WGM Inc., 24 pages (Held by Doyon Ltd., as proprietary report 78-42).

  • Deposit

    Moll, E.J., Silberman, M.L., and Patton, W.W. Jr., 1981, Chemistry, mineralogy, and K-Ar ages of igneous and metamorphic rocks of the Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811C, 15 p., 2 sheets, scale 1:250,000.

  • Deposit

    Clautice, K.H., Bowman, N.D., Clough, J.G., Gilbert, W.G., Kline, J.T., Smith, T.E., and Blodgett, R.B., 1993, Land selection Unit 8 (Kantishna River, Ruby, and Medfra quadrangles): References, lead isotope, geochemical and major oxide data: Alaska Division of Geological and Geophysical Surveys, 42 p., 1 sheet, scale 1:250,000.

  • Deposit

    DiMarchi, J.J., and Frantz, P.S., 1997, Annual Report for 1997-Doyon Option Lands, Block 10: ASA Inc.-Montague Gold Joint Venture Report, Volume II: Unpublished report, 189 p. (Report held by Doyon, Limited, Fairbanks, Alaska.)

Comments on the references

  • Primary Reference = DiMarchi and others, 1997

General comments

Subject category Comment text
Deposit Model Name = Porphyry Cu-Au (Cox and Singer, 1986; model no. 20c)
Deposit Other Comments = See Tarn (MD027), Pork Chop (MD031), Mystery Mt. East (MD028), and Copenhagen Hill (MD030) prospects. The Frozen Creek Prospect is on land selected or owned by Doyon Ltd. For additional information contact Doyon Ltd. at 210 1st Ave., Fairbanks, Alaska, 99701.

Reporter information

Type Date Name Affiliation Comment
Reporter 03-JUN-98 Bundtzen, T.K. Pacific Rim Geological Consulting