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  3. Mineral Resource Data System (MRDS)

Grays Peak Opal Deposit

Occurrence in Valley county in Idaho, United States with commodity Gemstone
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Ore body information
  12. Economic information about the deposit and operations
  13. Mining district
  14. Land status
  15. Links to other databases
  16. Bibliographic references
  17. Reporter information

Geologic information

Identification information

Deposit ID 10070888
MRDS ID W014015
Record type Site
Current site name Grays Peak Opal Deposit
Related records 10193836

Geographic coordinates

Geographic coordinates: -115.06815, 44.83568 (WGS84)
Elevation 2316
Relative position 5 MI N OF MIDDLE FORK GUARD STATION

Site location context

Political divisions (FIPS codes)

Valley(county)

Idaho(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Pungo Mountain(quadrangle 1:24,000 scale)

Pistol Creek(quadrangle 1:100,000 scale)

Challis(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Middle Fork Salmon(hydrologic unit)

Salmon(hydrologic accounting unit)

Lower Snake(hydrologic subregion)

Pacific Northwest(hydrologic region)

Federal lands

Salmon-Challis National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Frank Church-River of No Return Wilderness(Wilderness)

Wilderness FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Idaho Valley

Public Land Survey System information

Meridian Township Range Section Fraction State
Boise 017N 011E 01 Idaho

Comments on the location information

  • ON RIDGE AT HEAD OF COUGAR CREEK LAND STATUS VALUE CALCULATED 7-94 USING GIS OVERLAY ANALYSIS WITH USFS LAND OWNERSHIP BOUNDARIES, 1:126,720 SCALE.

Commodities

Commodity Importance
Gemstone Tertiary

Materials information

Materials Type of material
Opal Ore
Limonite Gangue

Alteration

  • (Local) Silicification

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Rock unit name Challis Volcanics-Rhyolite Porphyry;Challis Volcanics-Rhyolite With Obsidian
    Rock description Challis Volcanics-Rhyolite Porphyry;Challis Volcanics-Rhyolite With Obsidian
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite

Nearby scientific data

(1) -115.06815, 44.83568
ListMap

Economic information

Ore body information

  • General form PODS, STRINGERS
    Thickness 30.48M
    Length 1609.3M

Economic information about the deposit and operations

Development status Occurrence
Commodity type Non-metallic
Deposit size Small
Significant No

Mining district

District name Marble Creek District

Land status

Ownership category National Forest
Area name Boise National Forest
Ownership category National Primitive Area
Area name Idaho Primitive Area

Comments on development

  • ECON.COM: OPAL OF POOR GEM QUALITY

Reference information

Bibliographic references

  • Deposit

    CATER, F. W., AND OTHERS, 1973, MINERAL RESOURCES OF THE IDAHO PRIMITIVE AREA AND VICINITY, IDAHO: USGS BULL. 1304, 431 P

  • Deposit

    1973 RECON CATER, F. W., AND OTHERS, BULL. 130

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1974 Miller, Pat J. U.S. Geological Survey

Beyond USGS

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

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