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Unnamed (on hill 4890 east of VABM Keg)

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

Geologic information

Identification information

Deposit ID 10307475
Record type Site
Current site name Unnamed (on hill 4890 east of VABM Keg)

Geographic coordinates

Geographic coordinates: -146.20769, 62.79064 (WGS84)
Relative position The occurrence is near the crest of hill 4890 about 2.5 miles east of VABM Keg. It is in the NE1/4SW1/4, section 29, T. 12 N., R. 5 W., Copper River Meridian. The occurrence is located accurately within 1000 feet.

Site location context

Political divisions (FIPS codes)

Valdez-Cordova(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

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

Gulkana NW(quadrangle 1:100,000 scale)

Gulkana(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Middle Copper River(hydrologic unit)

Copper River(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

BLM(Federal land areas administered by BLM)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Copper Primary

Materials information

Materials Type of material
Azurite Ore
Chalcocite Ore
Malachite Ore

Alteration

  • (Local) Local introduction of epidote.

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) -146.20769, 62.79064
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The occurrence is in schistose, andesitic to basaltic, volcanic rocks, tentatively correlated with the Pennsylvanian to Permian, Tetelna Formation. Numerous occurrences of chalcocite partly oxidized to azurite and malachite occur in the section (Arehart, 1982, p. 3). This locality is Arehart's sample 2308 which contained more than 2 percent copper and 50 ppm silver. The sample was high-grade material; there are also probably numerous additional small copper occurrences in the vicinity.
  • Age = Remobilization of copper may have occurred during green-schist metamorphism in the Jurassic.

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Chistochina

Comments on the workings information

  • Workings / Exploration = The occurrence was found in 1981 during regional reconnaissance by Noranda Inc. on Ahtna Inc., regional Native corporation lands.

Reference information

Bibliographic references

  • Deposit

    Arehart, G.B., 1982, Reconnaissance geology/geochemistry of the Alphabet Hills, Gulkana Quadrangle, Alaska: Noranda Exploration, 4 p., maps and appendices. (Report held by Ahtna Minerals Co., Anchorage, Alaska).

Comments on the references

  • Primary Reference = Arehart, 1982

General comments

Subject category Comment text
Deposit Model Name = Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Deposit Other Comments = Outcrops are mostly limited to ridge crests; hill slopes below about 3,500 feet in elevation are mostly covered with gravel and have thick brush mats. Additional information can be obtained from Ahtna Minerals in Anchorage, Alaska.

Reporter information

Type Date Name Affiliation Comment
Reporter 20-DEC-00 W.T. Ellis Alaska Earth Sciences
Reporter 20-DEC-00 Hawley, C.C. Hawley Resource Group
Reporter 20-DEC-00 W.J. Nokleberg U.S. Geological Survey

Beyond USGS

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

Maps centered on this site

Authoritative Alaska resources

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