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Kelly Creek

Prospect 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. 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 10308739
Record type Site
Current site name Kelly Creek

Geographic coordinates

Geographic coordinates: -165.89943, 65.7713 (WGS84)
Relative position Kelly Creek, unofficially named in 1982 (the year actress Grace Kelly died), is a north tributary to the American River. The American River, a major drainage in the east-central Teller quadrangle, is itself a north tributary to the Agiapuk River whose mouth is on the intertidal Imuruk Basin. Kelly Creek is the largest tributary entering from the north in the area where the direction of flow of the American River changes from north to south. Kelley Creek splits into north and west headwater drainages about 7 miles upstream from its mouth. The Kelly Creek prospect is located in the headwaters of the west headwater drainage, 1.1 miles southeast of the continental divide at elevations of 800 to 950 feet. This prospect was discovered in 1982 and therefore not included as a locality by Cobb and Sainsbury (1972) or Cobb (1975).

Site location context

Political divisions (FIPS codes)

Nome(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Teller D-2(quadrangle 1:63,360 scale)

Bendeleben NW(quadrangle 1:100,000 scale)

Teller(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Shishmaref(hydrologic unit)

Northern Seward Peninsula(hydrologic accounting unit)

Northwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary

Comments on the commodity information

  • Gangue = carbonate

Materials information

Materials Type of material
Gold Ore
Arsenopyrite Gangue
Clay Gangue
Pyrite Gangue
Quartz Gangue

Alteration

  • Brecciation, silicification, and quartz stockwork veining is common in pelitic schist. Quartz veins may contain some carbonate minerals. Clay and limonite are present in some mineralized rocks.

Mineral occurrence model information

Model code 172
USGS model code 26a
Deposit model name Carbonate-hosted Au-Ag
Mark3 model number 15

Nearby scientific data

(1) -165.89943, 65.7713
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The Kelly Creek prospect is in metapelitic rocks - mica-quartz shist and graphitic quartz schist - intercalated in a metasedimentary sequence that includes schistose, micaceous, parly dolomitic marble, mica-calcite schist, and minor micaceous quartzite. The metasedimentary sequence is interpreted to represent a limestone-shale assemblage with related facies variations. It is now highly deformed and perhaps isoclinally folded. Schistosity now dips moderately in various directions in the prospect area; steep-dipping marble-schist contacts and other strong linear features may indicate the location of normal faults. A mafic to intermediate (?) metavolcanic and metasedimentary assemblage consisting of various greenschist and amphibolite lithologies intercalated regionally with some calcareous quartzite and marble is present in the headwaters of Fox Creek, 3 miles north of the Kelly Creek prospect. The relation of the metavolcanic assemblage to the pelitic schist/marble assemblage that hosts the Kelly Creek prospect is not known. All of the metavolcanic and metasedimentary rocks in the Kelly Creek and Fox Creek area are of unknown but probable Paleozoic age although Sainsbury (1972) mapped them as Precambrian. The Kelly Creek prospect is primarily within tundra-mantled metapelitic rocks in saddles and slopes between rubble uplands of schistose marble; bedrock outcrops are only locally present within the marble uplands. The metapelitic rocks have lineated quartz segregations along their foliation and disseminated euhedral pyrite crystals are common.Soil geochemical surveys following up gold and arsenic anomalies in stream sediments from the west headwater drainage of Kelly Creek led to discovery of the prospect (Hudson and Wyman, 1983; Hudson, 1984). The soil geochemical surveys defined an irregular but large area (3,000 x 4,000 feet) containing anomalous gold to 1.4 ppm, arsenic to greater than 1,000 ppm, antimony to 62 ppm, mercury to 5,000 ppb, and silver to 0.9 ppm. The gold, arsenic, and antimony values define strong, coherent, multielement anomalies. Mercury is commonly elevated along with these elements but its distribution and concentration is more erratic; it is more widely dispersed at anomalous levels than the other three elements.Rock samples from frost boils and surface pits 3 to 4 feet deep show that the stronger anomalies are associated with silicified breccia and quartz-stockwork veined, sooty, black carbonaceous quartz schist. Quartz stockwork veins are thin, less than 0.5 inches wide, and locally broken and recemented by a fine-grained, dark siliceous matrix. Two small diameter diamond drill holes encountered mineralization at shallow depths (Marrs and Ivey, 1984). These holes were oriented N 45 E, they were inclined 45 and 60 degrees, and they reached 140 and 154 feet total depth. One encountered 77 feet of 0.032 opt gold and the other 44 feet of 0.035 opt gold. The higher gold concentrations seem to be in a zone that dips shallowly west although all the rocks in these two holes had highly anomalous metal contents; gold is commonly present in the several hundred ppb range. Clay is locally present in fractures and as part of the matrix in breccia. Dolomite and calcite are reported to be in veins with quartz in some drill core (Marrs and Ivey, 1984). Pyrite is disseminated in pelitic schist and is present in all mineralized rocks and a part is probably sedimentary in origin. Quartz segregations along the foliation in pelitic shist are recrystallized, sugary textured, and vuggy in mineralized rocks. Arsenopyrite has not been conclusively identified but it is probably present. The controls on mineralization have not been defined, the distribution of grade has not been determined, and large areas of anomalous soil geochemistry have not been evaluated by the previous work.
  • Age = Unknown; probably mid-to Late Cretaceous; mineralization postdates regional deformation.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Active

Mining district

District name Port Clarence

Comments on the reserve resource information

  • Reserves = Not defined

Comments on the workings information

  • Workings / Exploration = Exploration includes: regional stream sediment geochemistry; a soil geochemical survey on a grid covering a 3,000 x 6,000 foot area; several shallow surface pits; and four small-diameter diamond drill holes (Cook Inlet Region, Inc., 1985).

Reference information

Bibliographic references

  • Deposit

    Hudson, T.L., and Wyman, W. F., 1983, Interim report on areas of Seward Peninsula warranting further prospecting and evaluation: Anchorage, Anaconda Minerals Company internal report, 84 p., 7 plates. (Report held by Cook Inlet Region Inc., Anchorage, Alaska.)

  • Deposit

    Marrs, C.D., and Ivey, J.A., 1984, 1984 Prospect evaluation project; Kelly Creek (Fox claims): Anchorage, Alaska, Anaconda Minerals Company internal report (Report held by Cook Inlet Region, Inc., Anchorage, Alaska).

  • Deposit

    Hudson, T.L., 1984, 1983 Seward Peninsula reconnaissance project: Anchorage, Alaska, Anaconda Minerals Company internal report (Report held by Cook Inlet Region, Inc., Anchorage, Alaska).

Comments on the references

  • Primary Reference = Hudson, 1984; Marrs and Ivey, 1984

General comments

Subject category Comment text
Deposit Model Name = Disseminated and stockwork quartz and gold mineralization in metapelitic rocks. Possibly carbonate-hosted Au-Ag (26a) and/or low sulfide Au-quartz vein (36a) models after Cox and Singer (1986)
Deposit Model Number = 26a, 36a

Reporter information

Type Date Name Affiliation Comment
Reporter 10-MAY-1998 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

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