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Ozzna Creek

Prospect in Alaska, United States with commodities Silver, Gold, Copper, Lead, Zinc, Molybdenum
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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. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10002590
MRDS ID A015027
Record type Site
Current site name Ozzna Creek
Related records 10185955

Geographic coordinates

Geographic coordinates: -153.94895, 62.29447 (WGS84)
Relative position The Ozzna Creek prospect is located on the north facing slopes of Ozzna Creek, a westerly flowing tributary of the Windy Fork, Kuskokwim River; it is at an elevation of 4,750 feet (1,448 m) in the SE1/4 sec. 32, T. 26 N., R. 25 W., of the Seward Meridian. Location corresponds to locality number 3 of Cobb (1972). Location is accurate; the reporter investigated the prospect in 1981.

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

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

McGrath SE(quadrangle 1:100,000 scale)

McGrath(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Kuskokwim River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary
Lead Primary
Zinc Critical Primary
Molybdenum Secondary

Comments on the commodity information

  • Gangue = Carbonate

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Molybdenite Ore
Pyrite Ore
Sphalerite Ore
Epidote Gangue
Quartz Gangue
Sericite Gangue

Alteration

  • (Local) Pyritic and sericitic alteration in breccia pipe.

Mineral occurrence model information

Model code 79
USGS model code 21a
Deposit model name Porphyry Cu-Mo
Mark3 model number 2

Host and associated rocks

  • Host or associated Associated
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Pyroclastic Rock > Volcanic Breccia (Agglomerate)

Nearby scientific data

(1) -153.94895, 62.29447
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The Ozzna creek prospect consists of base metal sulfide veins and replacement deposits within an extensive quartz-sericite-pyrite halo rimming a 450 meter wide, rugged, quartz monzonite breccia pipe, which forms the core of a distinctive, precipitous, 7,205-foot -high (2,197 m) peak. A biotite separate from the quartz monzonite breccia pipe yielded a K-Ar age of 58 Ma. (Solie and others, 1991). A pronounced magnetic high rims the edge of the breccia pipe (Rob Kell, written communication, 1983).? the vein and replacement deposits consist of small pods and lenses of pyrrhotite, sphalerite, argentiferous galena, and pyrite in a gangue of carbonate, epidote, and quartz along shear zones in felsic dikes and igneous breccia. Most massive sulfide pods range from 0.2 to 1.5 meters in width and 0.5 to 6.0 meters in length. Selected samples yielded 1,623.0 to 2,189.0 grams/tonne silver (Reed and Elliott, 1968, C 596).? An extensive quartz-sericite-pyrite halo that surrounds the quartz monzonite breccia pipe ranges from 15 to 60 meters wide, and can be traced along strike for about 450 meters. Disseminated chalcopyrite and traces of molybdenite occur in pyrite-rich igneous breccia. Selected samples from the quartz-sericite-pyrite halo contain up to 0.08 percent copper, 150 ppm molybdenum, 1.50 percent lead, 1.00 percent zinc, 14.6 grams/tonne silver, and 2.48 grams/tonne gold (Bundtzen, Kline, and Clough, 1982; Bundtzen, Harris, and Gilbert, 1997).
  • Age = Early Tertiary (58 Ma) , based on K-Ar biotite age of intrusion.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = Only surface sampling has been completed at the prospect. Selected samples from the quartz-pyrite-sericite halo contain up to 0.08 percent copper, 150 ppm molybdenum, 1.50 percent lead, 1.00 percent zinc, 14.6 grams/tonne silver, and 2.48 grams/tonne gold (Bundtzen, Kline, and Clough, 1982).

Reference information

Comments on the references

  • Primary Reference = Reed and Elliott, 1968 (C 596)

General comments

Subject category Comment text
Deposit Model Name = Porphyry copper molybdenum (?) (Cox and Singer, 1986; model 21a).
Deposit Other Comments = the magnetic anomaly that rims the quartz monzonite breccia pipe is similar to a geophysical feature found in porphyry copper systems throughout the North American Cordillera.

Reporter information

Type Date Name Affiliation Comment
Reporter 30-OCT-1998 T.K. Bundtzen Pacific Rim Geological Consulting

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.