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  3. Mineral Resource Data System (MRDS)

Unnamed (in the headwaters of an east fork of Ahtell Creek)

Occurrence in Alaska, United States with commodity Gold
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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 10307496
Record type Site
Current site name Unnamed (in the headwaters of an east fork of Ahtell Creek)

Geographic coordinates

Geographic coordinates: -144.01464, 62.87268 (WGS84)
Relative position The occurrence is at an elevation of about 4,800 feet on the northeast- facing slope of a ridge more than 6,000 foot high that separates two unnamed forks of upper Ahtell Creek. It is in the SW1/4SW1/4, section 25, T. 13 N., R. 7 E., Copper River Meridian. It is a generalized occurrence accurate to within 1,000 feet that includes several mineralized outcrops.

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)

Federal lands

Ahtna, Incorporated(ANCSA Region)

ANCSA Region NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary

Comments on the commodity information

  • Gangue = Carbonate minerals

Materials information

Materials Type of material
Gold Ore
Magnetite Ore
Pyrite Ore
Quartz Gangue

Alteration

  • (Local) Extensive silica-carbonate alteration of dioritic rocks.

Nearby scientific data

(1) -144.01464, 62.87268
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The occurrence is in the Jurassic 'tectonic, diorite to quartz diorite complex' of Richter that underlies the eastern part of the Ahtell Creek area (Richter, 1966; Richter and Matson, 1968; Richter, Lanphere, and Matson, 1975). It was discovered in 1979 following up a 1978 stream sediment survey of the area for the Ahtna Native corporation (WGM Inc., 1979). It is within a several-mile-long, gold-bearing trend aligned northwest that was called area 1 by WGM Inc. WGM found six streams in the belt with gold values from 200 to 850 ppb gold. During the follow up at this location, WGM Inc.(1980) identified a 50-foot- wide silica-carbonate-altered diorite that contained 205 ppb gold. Up hill from the diorite, a 2-foot-thick hanging wall of a quartz-pyrite vein contained 335 ppb gold. A float cobble of magnetite from the same area contained 3,260 ppb gold (0.095 ounce of gold per ton). It is not known if further work has been done in the area.
  • Age = Possibly related to a Jurassic diorite complex.

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 = Stream sediments collected by WGM in 1978 were followed up in 1979 by outcrop sampling.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = WGM Inc., 1979

General comments

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

Reporter information

Type Date Name Affiliation Comment
Reporter 07-DEC-00 W.T. Ellis Alaska Earth Sciences
Reporter 07-DEC-00 Hawley, C.C. Hawley Resource Group
Reporter 07-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.