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Grasshopper Prospect

Occurrence in Beaverhead county in Montana, United States with commodities Copper, Zinc, Molybdenum, Gold, Silver
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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. Economic information about the deposit and operations
  12. Mining district
  13. Land status
  14. Ownership information
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10013905
MRDS ID D010457
Record type Site
Current site name Grasshopper Prospect

Geographic coordinates

Geographic coordinates: -112.91756, 45.15546 (WGS84)
Elevation 2042
Location accuracy 2000(meters)
Relative position 3.8 MI S 85 E OF BANNACK

Site location context

Political divisions (FIPS codes)

Beaverhead(county)

Montana(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Bannack(quadrangle 1:24,000 scale)

Dillon(quadrangle 1:100,000 scale)

Dillon(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Beaverhead(hydrologic unit)

Missouri Headwaters(hydrologic accounting unit)

Missouri Headwaters(hydrologic subregion)

Missouri(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management MT)

Bureau of Land Management MT BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States Montana Beaverhead

Public Land Survey System information

Meridian Township Range Section Fraction State
Montana Principal 008S 011W 01,02,03,10,11,12,13,14,15 Montana

Comments on the location information

  • 2 MI DIA PLUTON CENTERED ON C OF N2, SECT 11. ; INFO FROM LAND.ST :(1978)

Commodities

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

Materials information

Materials Type of material
Chalcopyrite Ore
Gold Ore
Molybdenite Ore
Silver Ore
Limonite Gangue
Magnetite Gangue
Pyrite Gangue

Alteration

  • (Local) 2 Mi Diameter Alteration System

Analytical data

Result SAMPLE VALUES RANGE UP TO 620 PPM CU, 55 PPM MO, 0.23 PPM AU, 0.80 PPM AG, 680 PPM ZN

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Dacite
    Rock unit name Grasshopper Stock
    Rock description Grasshopper Stock
    Stratigraphic age (youngest) Cretaceous
    Chronological age 73.4
    Dating method K-Ar
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Dacite
    Stratigraphic age (youngest) Cretaceous
    Chronological age 73.4
    Dating method K-Ar

Nearby scientific data

(1) Intrusive rock
ListMap

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1977
Discoverer Cities Service Corp.

Mining district

District name Bannack District

Land status

Ownership category National Forest

Ownership information

  • Type Owner
    Owner Molycorp
    First year 1982

Comments on the workings information

  • AFEW SMALL PITS, 3 DRILLHOLES

Comments on development

  • 3 ROTARY HOLES DRILLED IN 1978. TOTAL FOOTAGE, 1467 FT, MAX DEPTH, 550 FT.

Reference information

Bibliographic references

  • Deposit

    MEYER, J.W., 1980 M.S. THESIS, U. OF ARIZ

General comments

Subject category Comment text
Deposit CONCENTRICLY ZONED STOCK. COMPOSITION, ALTERATION AND MINERALIZATION FORM CIRCULAR ZONES.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1983 Loen, Jeffrey S. (Pearson, Robert C.) 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