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Silver Creek

Prospect in Park county in Wyoming, United States with commodities Copper, 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. Nearby scientific data
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Ownership information
  12. Reserves and resources
  13. Bibliographic references
  14. General comments

Geologic information

Identification information

Deposit ID 10400368
Record type Deposit
Current site name Silver Creek

Comments on the site identification

  • Record in Metals Economics Group database (www.metalseconomics.com, subscription only access) suggests that the Ned Claims are in this area and are likely included in this record.

Geographic coordinates

Geographic coordinates: -109.6748, 44.0283 (WGS84)

Site location context

Political divisions (FIPS codes)

Park(county)

Wyoming(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Fall Creek(quadrangle 1:24,000 scale)

Carter Mountain(quadrangle 1:100,000 scale)

Cody(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

South Fork Shoshone(hydrologic unit)

Big Horn(hydrologic accounting unit)

Big Horn(hydrologic subregion)

Missouri(hydrologic region)

Federal lands

Shoshone National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Washakie Wilderness(Wilderness)

Wilderness FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Wyoming Park

Comments on the location information

  • Located within the Washakie Wilderness Area of the Shoshone National Forest

Commodities

Commodity Importance
Copper Primary
Molybdenum Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Molybdenite Ore
Bornite Ore
Galena Ore
Pyrite Ore
Sphalerite Ore
Quartz Gangue
Biotite Gangue
Feldspar Gangue
Calcite Gangue
Chlorite Gangue
Epidote Gangue
Muscovite Gangue

Alteration

  • (Local) PHYLLIC, POTASSIC, PROPYLITIC
  • (Local) MAGNETITE

Analytical data

Result MAXIMUM CONCENTRATIONS IN PPM, 20000 CU, 150 MO, 440 PB, 2000 ZN, 20 AG, 0.8 AU ( FISHER AND OTHERS, 1977.)

Nearby scientific data

(1) -109.6748, 44.0283
ListMap

Economic information

Ore body information

  • General form HYDROTHERMAL STOCK, DISSEMINATED AND VEINS
    Strike E-W
    Length 600M
    Width 300M

Comments on the geologic information

  • TWO PORPHYRITIC INTRUSIVE PHASE, DACITE-RHYOLITE (MOST MINERALIZED) AND A DACITE. WELL DEVELOPED ALTERATION AND METAL ZONING. METALLIZATION OCCURRED AFTER ALTERATION.
  • The following is summarized from Hausel, (1997)
    In the Silver Creek area two intrusive phases are emplaced in Tertiary extrusive volcanic rocks of the Wapiti, Trout Peak Trachyandesite, and Wiggins Formations. These consist of basalt flows, volcanic breccias, and flow breccisa. The intrusive complex is mainly dacites and rhyodacites in composition. The volcanic host rocks and the intrusive are intensely hydrothermally altered. The intrusive complex consists of two phases. The larger and more mineralized stock is a dacite-rhyodacite porphyry that contains copper and molybdenum mineralization with high amounts of magnetite. The other smaller and less mineralized stock is a dacite porphyry. Alteration in the outer zone is perdominantly propylitic which grades inward to localized phyllic and potassic alteration and sericitic at the intrusive center. The major sulfides (chalcopyrite, bornite, molybdenite) are localized within the phyllic, potassic and sericitic zones.

Economic information about the deposit and operations

Development status Prospect
Significant Yes

Ownership information

  • Type Owner
    Owner U.S. Forest Service

Comments on the ownership information

  • Possible ownership incorrectly mentioned in the References section of deleted record 10303561 (0560070173)

Reserves and resources

  • Type In-situ
    Estimate year 1982
    Total resources 27000000mt ore
    Remarks Estimate from limited drilling\nJ. Wells (Hausel,1997)
    Commodity Subtype Grade units Group Importance Year
    Copper 0.5 wt-pct Copper Primary 1982

Reference information

Bibliographic references

  • Geology

    Hausel, 1997, Copper, Lead, Zinc, Molybdenum, and Associated Metal Deposits Of Wyoming: WYoming State Geological Survey Bull 70, P. 23-34.

  • Deposit

    Fisher, F., Antweiler, J., and Welsch, E. 1977, Preliminary geological and geochemical results from the Silver Creek and Yellow Ridge mineralized areas in the Washakie Wilderness, Wyoming, USGS OF77-225

  • Deposit

    Hanbury, J., 1982 Hydrothermal alteration and mineralization of the Silver Creek porphyry copper deposit, Park County, Wyoming: M.S. thesis Washington State Univ. Pullman, 44 p.

General comments

Subject category Comment text
Deposit MOSTLY DISSEMINATED PYRITE AND CHALCOPYRITE. WELL DEVELOPED ZONING, PYRITE IN CENTER WITH CHALCOPYRITE INCREASING OUTWARDS. GALENA AND SPHALERITE ALSO ON THE PERIPHYRY. ALTERATION IS PROPYLITIC (CHLORITE, EPIDOTE, CALCITE) ON MARGINS WITH PHYLLIC ALTERATION (QUARTZ, SERICITE, PYRITE) IN CENTER. PATCHY QUARTZ K-SPAR, AND SECONDARY BIOTITE AND MAGNETITE IN IRREGULAR ZONES IN CENTER. CENTRAL ZONE CONTAINS HIGHEST COPPER AND MO.
Deposit The following is summarized from Hausel, (1997) and Fisher and others (1977)
At the Silver Creek Porphyry a well developed pyrite halo is localized in the phyllic zone and encloses a highly mineralized 2000 by 1000 ft. stockwork complex near the center of the intrusive complex. This mineralized zone contains disseminated malachite, chalcopyrite, bornite, and minor molybdenite, along with chalcopyrite-pyrite-magnetite-quartz veinlets. Fractures in the stockwork trend N35W to N80W and dip steeply. The total sulfide content is as high 2% in the phyllic zone and as much as .5% in the potassium-silicate zone. The highest copper grades occur in the potassium-silicate zone. Analytical results of surface samples (Fisher and others, 19770 show highy anomalous concentrations of copper, smaller but anomalous concentrations of lead, zinc, molybdenum, silver, and gold. Surface values of molybdenum do not exceed .01% (Hanbury, 1982). Drillhole data from a 280 ft hole show molybdenite and chalcopyrite throughout the entire length of the hole.
Estimates of resources of the Silver Creek porphyry from sparse drilling suggest an orebody of at least 27 million tons of .5% Cu.

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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