1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Unnamed (northeast of the head of Quartz Creek)

Occurrence in Alaska, United States with commodities Gold, Silver, Lead, Zinc
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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. 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 10307481
Record type Site
Current site name Unnamed (northeast of the head of Quartz Creek)

Geographic coordinates

Geographic coordinates: -144.02263, 62.79968 (WGS84)
Relative position This occurrence is an altered-sulfidized area more than one-mile long and about one-quarter mile across. It trends east-northeast across the ridge that divides Ahtell and Porcupine Creeks, northeast of the head of Quartz Creek. The center of the area is about 1,000 feet west of the center of section 24, T. 12 N., R. 7 E., Copper River Meridian.

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-1(quadrangle 1:63,360 scale)

Gulkana NE(quadrangle 1:100,000 scale)

Gulkana(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper 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
Gold Primary
Silver Secondary
Lead Secondary
Zinc Critical Secondary

Comments on the commodity information

  • Gangue = Carbonate minerals

Materials information

Materials Type of material
Galena Ore
Gold Ore
Pyrite Ore
Sphalerite Ore
Quartz Gangue

Alteration

  • (Local) Silicification; formation of silica-carbonate rock in intermediate volcanics; local sulfidation.

Nearby scientific data

(1) -144.02263, 62.79968
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rocks are mainly Pennsylvanian to Permian volcanic rocks with lesser sedimentary rocks (Richter, 1966; Richter and Matson, 1968). They have been silicified, converted to silica-carbonate rocks, and locally sulfidized along a east-northeast to northeast trending zone more than one mile long (WGM Inc., 1980). A soil sample collected in approximately the center of the zone contained more than 500 ppb gold. Rock samples collected from the altered zone locally contained more than 2,000 ppb gold, 20 ppm silver, and 5,000 ppm lead and zinc (Bull, Freeman, and Schneider, 1999).
  • Age = Possibly related to a nearby Jurassic diorite intrusion.

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 = Only reconnaissance mapping and sampling of natural exposures.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = WGM Inc., 1980, and Bull, Freeman and Schneider, 1999

General comments

Subject category Comment text
Deposit Model Name = Gold porphyry
Deposit Other Comments = Additional information can be obtained from Ahtna Minerals in Anchorage, Alaska.

Reporter information

Type Date Name Affiliation Comment
Reporter 08-DEC-00 W.T. Ellis Alaska Earth Sciences
Reporter 08-DEC-00 Hawley, C.C. Hawley Resource Group
Reporter 08-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.