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  3. Mineral Resource Data System (MRDS)

Unnamed (east of Stony River)

Occurrence in Alaska, United States with commodities Copper, Silver
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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. Host and associated rocks
  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 10002179
MRDS ID A013076
Record type Site
Current site name Unnamed (east of Stony River)

Geographic coordinates

Geographic coordinates: -153.6683, 61.29863 (WGS84)
Relative position This occurrence is at an elevation of about 5,000 feet on the south flank of a ridge on the east side of Stony River valley. The map site is near the southeast corner of section 13, T 14 N, R 25 W, of the Seward Meridian. This is location 17 of MacKevett and Holloway (1977), location 6 of Resource Associates of Alaska (1976), and location 44 of Gamble and others (1989). It is included as an unnamed occurrence by Cobb and Reed (1981). It is approximately located, perhaps to within one-half mile.

Site location context

Political divisions (FIPS codes)

Bethel(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Lime Hills B-2(quadrangle 1:63,360 scale)

Lime Hills SE(quadrangle 1:100,000 scale)

Lime Hills(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Stony River(hydrologic unit)

Upper Kuskokwim River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Silver Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Pyrrhotite Ore
Epidote Gangue
Quartz Gangue

Alteration

  • (Local) Silicification and epidote replacement.

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Siltstone

Nearby scientific data

(1) Qs
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Cobb and Reed (1981) reported that chalcopyrite, pyrite, and pyrrhotite occur as blebs and disseminations in Cretaceous(?) metasedimentary rocks adjacent to a Tertiary granitic pluton. The mineralization is localized in metasiltstone and metaconglomerate adjacent to and in roof pendants of the quartz diorite to quartz monzonite pluton. The metasedimentary rocks contain blebs and vugs of epidote, quartz, and feldspar. The area is crosscut by a regional northwest-trending fault. A 1,500-foot-diameter gossan containing 20 percent pyrite lies to the north of the occurrence. Rock samples contain as much as 2,700 ppm coppper and 7 ppm silver (Resource Associates of Alaska, 1976).
  • Age = Tertiary. Mineralization is in the altered zone around a Tertiary pluton.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Aniak

Comments on the workings information

  • Workings / Exploration = Reconnaissance sampling has been completed in this area.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Resource Associates of Alaska, 1976

General comments

Subject category Comment text
Deposit Model Name = Disseminated sulfides in contact zone of granitic pluton

Reporter information

Type Date Name Affiliation Comment
Reporter 10-JUN-2001 Travis L. Hudson Applied Geology
Reporter 10-JUN-2001 Travis L. Hudson Applied Geology

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.