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  3. Mineral Resource Data System (MRDS)

Jim Creek

Occurrence in Alaska, United States with commodities Silver, Copper, Zinc, 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 10000975
MRDS ID A011646
Record type Site
Current site name Jim Creek
Related records 10258799

Geographic coordinates

Geographic coordinates: -148.80265, 61.56956 (WGS84)
Relative position Prospect is located 1.5 mile downstream from the headwaters of Jim Creek at a point roughly 1,500 ft north of the creek . Location accurate within 1 mile. Locality 45 of Cobb (1972), and locality 34 of MacKevett and Holloway (1977).

Site location context

Political divisions (FIPS codes)

Matanuska-Susitna(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Anchorage C-5(quadrangle 1:63,360 scale)

Anchorage NW(quadrangle 1:100,000 scale)

Anchorage C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Matanuska(hydrologic unit)

Knik Arm(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

BLM(Federal land areas administered by BLM)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Copper Primary
Zinc Critical Primary
Gold Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
Chalcopyrite Ore
Pyrrhotite Ore
Sphalerite Ore
Calcite Gangue
Quartz Gangue

Alteration

  • (Local) Calcite and quartz replacement of greenstone at periphery of sulfide vein.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Nearby scientific data

(1) -148.80265, 61.56956
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Heavily silicified greenstone is cut by a vein that averages 1 ft thick. The vein strikes N 80 W, and is approximately vertical. The vein is composed of 40 percent chalcopyrite, 40 percent pyrrhotite, 15 percent sphalerite, and 5 percent calcite; and assays show 15.08 percent Cu, 2.95 percent Zn, 1.75 oz/ton Ag, and trace Au. The greenstone on both sides of the sulfide vein has been replaced by quartz and calcite, and cut by very thin arsenopyrite veins. Assays of replaced wall rock show 0.41 oz/ton Ag and 0.04 percent Cu. An alaskite dike runs approximately 500 ft upslope the sulfide vein prospect and slate outcrops 50 ft downhill from prospect (Landes, 1927).
  • Age = Mesozoic or younger

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Anchorage

Comments on the workings information

  • Workings / Exploration = The vein is composed of 40 percent chalcopyrite, 40 percent pyrrhotite, 15 percent sphalerite, and 5 percent calcite; and assays show 15.08 percent Cu, 2.95 percent Zn, 1.75 oz/ton Ag, and trace amounts of Au. Assays of replaced wall rock show 0.41 oz/ton Ag and 0.04 percent Cu (Landes, 1927).

Reference information

Bibliographic references

  • Deposit

    Landes, K.K., 1927, Geology of the Knik-Matanuska District, Alaska: U.S. Geological Survey Bulletin 792-B, p. 51-72.

  • Deposit

    Berg, H.C., and Cobb, E.H., 1967, Metalliferous Lode Deposits of Alaska. U.S. Geological Survey Bulletin 1246, 254 p.

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Anchorage quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-409, 1 sheet, scale 1:250,000.

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.

  • Deposit

    Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials in the Anchorage quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1095, 184 p.

Comments on the references

  • Primary Reference = Landes, 1927

General comments

Subject category Comment text
Deposit Model Name = Polymetallic vein (Cox and Singer, 1986; model 22c)

Reporter information

Type Date Name Affiliation Comment
Reporter 30-JUL-1998 D.P. Bickerstaff U.S. Geological Survey
Reporter 30-JUL-1998 S.W. Huss 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.