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Grigg Group

Prospect in Madison county in Montana, United States with commodities Tungsten, Silver, Lead, Manganese, Copper, Gold, Molybdenum
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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. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Ownership information
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10022655
MRDS ID FS00047
Record type Site
Current site name Grigg Group
Alternate or previous names Wilson, Roosevelt, Grant, Lincoln, Washington, Granite Mtn 1, 2 and 3 Claims
Related records 10294327

Geographic coordinates

Geographic coordinates: -111.97142, 45.57407 (WGS84)
Elevation 2515
Relative position APPROXIMATELY 12.5 - 13 MILES SW FROM PONY, MONTANA

Site location context

Political divisions (FIPS codes)

Madison(county)

Montana(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Potosi Peak(quadrangle 1:24,000 scale)

Bozeman(quadrangle 1:100,000 scale)

Bozeman(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Jefferson(hydrologic unit)

Missouri Headwaters(hydrologic accounting unit)

Missouri Headwaters(hydrologic subregion)

Missouri(hydrologic region)

Federal lands

Beaverhead-Deerlodge National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Montana Madison

Public Land Survey System information

Meridian Township Range Section Fraction State
Montana Principal 003S 003W 17,16 Montana

Comments on the location information

  • LOCATED ALONG SOUTH WILLOW CREEK BETWEEN POTOSI PEAK AND MINE PEAK.

Commodities

Commodity Importance
Tungsten Critical Primary
Silver Primary
Lead Tertiary
Manganese Critical Tertiary
Copper Tertiary
Gold Tertiary
Molybdenum Tertiary

Comments on the commodity information

  • SAMPLES FROM DISCOVERY CUT NO. 1 AND DEVELOPMENT CUT NO. 2.

Materials information

Materials Type of material
Huebnerite Ore
Tetrahedrite Ore
Fluorite Gangue
Galena Gangue
Pyrite Gangue

Analytical data

Result ASSAYS AVAILABLE FROM FOREST SERVICE

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Quartz Monzonite
    Rock unit name Pre-Belt Pony-Cherry Creek Gneiss
    Rock description Pre-Belt Pony-Cherry Creek Gneiss
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Neoproterozoic

Nearby scientific data

(1) -111.97142, 45.57407
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Tobacco Root Batholith
Type of structure Local
Structure description Nw-Trending Bismark Fault

Ore body information

  • General form IRREGULAR

Controls for ore emplacement

  • Tobacco Root Batholith Intrusion Into Prec Pre-Belt Gneiss

Comments on the geologic information

  • TOBACCO ROOT BATHOLITH: THIS BATHOLITH HAS INTRUDED THE PRE - BELTIAN, PRECAMBRIAN METAMORPHIC ROCKS AND PALEOZOIC SEDIMENTARY ROCKS DURING LARAMIDE OROGENY. WHICH OCCURED IN THIS AREA DURING LATE CRETACEOUS OR EARLY EOCENE TIME. {{ SEDIMENTARY FORMATIONS: PLEISTOCENE MORAINE AND RECENT STREAM ALLUVIUM WHICH COVER THE CANYON FLOOR. {{ METAMORPHIC ROCKS: MADE UP OF THOUSANDS OF FEET OF DARK - COLORED GNEISSES AND SCHISTS BELONGING TO THE PONY SERIES OF PRECAMBRIAN AGE. {{ IGNEOUS ROCKS: THE TYPICAL IGNEOUS ROCKS ARE QUARTZ - MONZONITE COMPOSED OF ABOUT 20% QUARTZ, 30% ORTHOCLASE, 40% PLAGIOCLASE, FLEDSPARS, LESS THAN 3% BIOTITE, AND 1% HORNBLENDE. ACCESSORY MINERALS ARE ABOUT 2% SPHENE, 1% APATITE, AND 2% MAGNETITE AND SULFIDES (PYRITE).

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic
Significant No

Mining district

District name Potosi

Ownership information

  • Type Owner
    Owner E. Roy Grigg

Comments on the workings information

  • CLAIM EXAMINED EARLIER BUT NO REPORT FOUND DISCOVERY CUT NO. 1 - DOZER CUT, 12 FT. W BY 6 - 8 FT. DEEP BY 130 FT. LONG. A HAND - DUG TRENCH CROSSES THE CENTRAL PORTION OF THE TRENCH (D. CUT), IT IS 2 - 4 FT. W. BY 3 FT. D. BY 15 FT. LONG; DEV. CUT NO. 2 5 - 8 FT. W. BY 3 - 15 FT. DEEP BY 30 FEET LONG.

Reference information

Bibliographic references

  • Deposit

    MBMG INF CIRC 21, P. 36.

  • Deposit

    MBMG MEM 9, P. 32.

  • Deposit

    CONSV. COMP DATE, 11-06-1963.

  • Deposit

    1933 RECON MBMG MEM 9

  • Deposit

    1961 DIREXPL USFS - CAN'T FIND REPORT

  • Deposit

    1968 DIREXPL USFS

General comments

Subject category Comment text
Deposit STRIKES RANGE IN THE NORTHWEST N5-10E; AND IN THE SOUTH WEST N70E WITH DIPS 60-80 NW

Reporter information

Type Date Name Affiliation Comment
Reporter 01-SEP-1975 Hunter, Marilyn D. U.S. Geological Survey
Updater 01-MAY-1980 Doyle, Brien (Wells, John) U.S. Geological Survey

Beyond USGS

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

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