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Grant and Hartford Mine

Past Producer in Granite county in Montana, United States with commodities Gold, Silver, Copper, Lead, Antimony, Barium-Barite
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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. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Ownership information
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10071351
MRDS ID W014685
Record type Site
Current site name Grant and Hartford Mine
Related records 10123463

Geographic coordinates

Geographic coordinates: -113.3376, 46.82295 (WGS84)
Elevation 1795
Location accuracy 250(meters)
Relative position ABOUT 0.3 KM SOUTH OF GARNET

Site location context

Political divisions (FIPS codes)

Granite(county)

Montana(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Elevation Mountain(quadrangle 1:24,000 scale)

Missoula East(quadrangle 1:100,000 scale)

Butte(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Blackfoot(hydrologic unit)

Pend Oreille(hydrologic accounting unit)

Kootenai-Pend Oreille-Spokane(hydrologic subregion)

Pacific Northwest(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 Granite

Public Land Survey System information

Meridian Township Range Section Fraction State
Montana Principal 012N 014W 03 Montana

Comments on the location information

  • UTM LOCATION OF GRANT & HARTFORD ADIT

Commodities

Commodity Importance
Gold Primary
Silver Primary
Copper Secondary
Lead Secondary
Antimony Critical Tertiary
Barium-Barite Critical Tertiary

Materials information

Materials Type of material
Chalcopyrite Ore
Gold Ore
Tetrahedrite Ore
Ankerite Gangue
Barite Gangue
Calcite Gangue
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) Oxidation

Analytical data

Result OXIDIZED ORE 1.5-5 OZ/TON AU, 1.5-5 OZ/TON AG,

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Garnet Stock
    Rock description Garnet Stock
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Late Cambrian
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Quartzite
    Rock unit name Silver Hill Formation;Flathead Formation;Garnet Range Formation, Micaceous Quartzite;Missoula Group
    Rock description Silver Hill Formationt;Flathead Formationt;Garnet Range Formation, Micaceous Quartzite;Missoula Group
  • Host or associated Host
    Rock type Metamorphic Rock > Schist

Nearby scientific data

(1) -113.3376, 46.82295
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Bearmouth Overthrust, Deep Creek Anticline, Mount Baldy Synclinorium
Type of structure Local
Structure description Deep Creek Anticline.

Ore body information

  • General form TABULAR VEIN WITH BANDED STRUCTURE THAT FOR THE MOST PART FOLLOWS THE BEDDING PLANE
    Strike N 50 W
    Dip 30 NE
    Width 0.61M

Controls for ore emplacement

  • Deep Creek Anticline, Garnet Stock, Garnet Range Fm.

Comments on the geologic information

  • VEIN LIES ON BEDDING PLANE ON N LIMB AND NEAR CREST OF DEEP CREEK ANTICLINE WHICH HERE TRENDS N 80 W AND PLUNGES AABOUT 30 W.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Both
Deposit size Small
Significant No

Mining district

District name Garnet (First Chance) District

Ownership information

  • Type Operator
    Owner Garnet Butte Gold Mining Co.
  • Type Owner
    Owner Garnet Butte Gold Mining Co.
    Home office Butte, Mt

Comments on the production information

  • ESTIMATES MADE USING DISTRICT PRODUCTION AND PRODUCTION VALUE . $30000 PRE 1910.

Comments on the reserve resource information

  • DOWNWARD PROJECTION OF STRUCTURE INDICATES VEIN WOULD INTERSECT GRANODIORITE ABOUT 1000 FT DOWNDIP FROM SURFACE, AND IT IS ESTIMATED THAT VEIN HAS BEEN MINED TO AT LEAST HALF THIS DEPTH. OXIDIZED ORE RAN ABOUT 3 TOZ/ST AU SO PRIMARY SULFIDE ORE MAY BE EXPECTED TO BE RELATIVELY RICH EVEN AT DEPTH.

Workings at the site

  • Type of workings Underground
    Length 1000M
    Overall depth 100M

Comments on the workings information

  • VEIN DEVELOPED BY GRANT & HARTFORD ADIT ON EAST BANK OF FIRST CHANCE GULCH, TUNNEL NO. 5 DRIVEN SOUTH FROM GARNET STOCK, AND SEVERAL ADITS AT HIGHER LEVELS. HAD TRESSLE OVER ROAD TO CONNECT MAIN ADIT AND DUMP

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit THE VEIN OCCUPIES A BEDDING PLANE OF THE SHIST AND QUARTZITE EXCEPT WHERE IT CROSSES A SMALL GRANODIORITE DIKE. 200 FT FROM PORTAL THE VEIN IS LOST IN A NE FAULT ZONE, IT REAPPEARS E IN THE MAGONE AND ANDERSON ZONE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-SEP-1976 Krohn, Douglas H. U.S. Geological Survey
Updater 01-APR-1981 Wise, Kristine K. (Elliott, James E.) U.S. Geological Survey

Beyond USGS

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

External references

Maps centered on this site