Unnamed (headwaters of theYuki River)

Occurrence in Alaska, United States with commodities Copper, Zinc, Silver, Molybdenum

Geologic information

Identification information

Deposit ID 10307891
Record type Site
Current site name Unnamed (headwaters of theYuki River)

Geographic coordinates

Geographic coordinates: -157.37311, 64.21945 (WGS84)
Relative position This occurrence, locally called the Yuki River gossan, is near the headwaters of the Yuki River, in the southern Kaiyuh Mountains. For this record, the site is plotted at an elevation of about 800 feet, in the NW1/4 sec. 6, T. 15 S. R. 8 E., Kateel River Meridian. river. The location is accurate within 2 miles.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Copper Primary
Zinc Primary
Silver Secondary
Molybdenum Secondary


  • (Local) Conspicuous iron-oxide alteration.

Nearby scientific data

(1) -157.37311, 64.21945

Comments on the geologic information

  • Geologic Description = This occurrence is a conspicuous ferricrete deposit 700 meters long and 2 to 5 meters thick along the Yuki River (Flanigan, 1998). The gossan is composed of rounded cobbles and pebbles of quartz-graphite schist, chlorite schist, quartzite, and greenstone in a limonite and manganese oxide matrix. The ferricrete rests unconformably on moderately to steeply dipping muscovite-quartz schist. Twenty-five rock samples contain values up to 180 ppm copper, 208 ppm zinc, 0.9 ppm silver, and 20 ppm molybdenum (Flanigan, 1998). See also NL002, 008, 009, and 011.
  • Age = Flanigan (1998) suggests that the molybdenum content of this occurrence may link it to the Round Top quartz monzonite intrusive complex (NL011), which has been dated at about 75 Ma.

Economic information

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Probably inactive

Mining district

District name Kaiyuh

Comments on the workings information

  • Workings / Exploration = This occurrence was discovered by Anaconda Minerals Company in 1980 (Flanigan, 1998).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF NL010

Bibliographic references

  • Deposit

    Flanigan, B., 1998, Genesis and mineralization of ore deposits in the Illinois Creek region, West Central Alaska: University of Alaska, Fairbanks, M.Sc. thesis, 125 p., 2 plates.

Comments on the references

  • Primary Reference = Flanigan, 1998

General comments

Subject category Comment text
Deposit Model Name = Plutonic-related Cu-Zn

Reporter information

Type Date Name Affiliation Comment
Reporter 07-AUG-01 Cameron, C.E. Northern Associates Inc.