Unnamed (east tributary of Wortmanns Glacier)

Occurrence in Alaska, United States with commodities Copper, Zinc, Silver
Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Mineral occurrence model information
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10307371
Record type Site
Current site name Unnamed (east tributary of Wortmanns Glacier)

Geographic coordinates

Geographic coordinates: -145.65252, 60.94961 (WGS84)
Relative position This occurrence is at an elevation of 4000 feet above an east tributary to Wortmanns Glacier and 1.4 miles due south of peak 6145. It is in the NW1/4 sec. 6, T. 11 S., R. 2 W., of the Copper River Meridian. The location of the site is accurate to within 2000 ft. The occurrence is shown as site C-97 in Jansons and others (1984).

Site location context

Political divisions (FIPS codes)

Valdez-Cordova(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Cordova D-5(quadrangle 1:63,360 scale)

Cordova NW(quadrangle 1:100,000 scale)

Cordova C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Copper River(hydrologic unit)

Copper River(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Zinc Critical Primary
Silver Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Sphalerite Ore

Mineral occurrence model information

Model code 90
USGS model code 24a
Deposit model name Massive sulfide, Cyprus
Mark3 model number 11

Nearby scientific data

(1) -145.65252, 60.94961

Economic information

Comments on the geologic information

  • Geologic Description = The country rocks at this occurrence are metavolcanic rocks (greenstone) and metasedimentary rocks of the Upper Cretaceous Valdez Group. These rocks are part of a 65-mile-long belt of volcanic rocks having potential for volcanogenic massive sulfide deposits, extending to the Copper River (Nelson and others, 1984; 1985). The ore minerals at this site presumably are chaclopyrite, pyrite, and sphalerite, but their mode of occurrence has not been made public. One grab sample contained 1.0% Zn, 0.1 to 0.5% Cu, and 0.5 ppm to 3 ppm Ag (Jansons and others, 1984).
  • Age = Late Cretaceous based on the age of the host rocks.

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Copper River

Comments on the workings information

  • Workings / Exploration = Site was sampled as part of a U.S. Bureau of Mines and U.S.G.S. mineral resource assessment of the Chugach National Forest (Jansons and others, 1984; Nelson and others, 1984). One grab sample contained 1.0% Zn, 0.1 to 0.5% Cu, and 0.5 ppm to 3 ppm Ag (Jansons and others, 1984).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Jansons and others, 1984

General comments

Subject category Comment text
Deposit Model Name = Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Deposit Other Comments = Crowe and others (1992; 1993) and Sainsbury (1993) discuss the genesis of the volcanogenic massive sulfide deposits in this area.

Reporter information

Type Date Name Affiliation Comment
Reporter 10-JUN-00 S.W. Nelson U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.