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  3. Mineral Resource Data System (MRDS)

Big Bonanza

Past Producer in Madison county in Montana, United States with commodity Gold
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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. Land status
  17. Ownership information
  18. Workings at the site
  19. Links to other databases
  20. Bibliographic references
  21. General comments
  22. Reporter information

Geologic information

Identification information

Deposit ID 10019955
MRDS ID DC12049
Record type Site
Current site name Big Bonanza

Geographic coordinates

Geographic coordinates: -112.49005, 45.63601 (WGS84)
Elevation 1890
Relative position 1.5 MILES NE OF ROCHESTER

Site location context

Political divisions (FIPS codes)

Madison(county)

Montana(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Table Mountain(quadrangle 1:24,000 scale)

Butte South(quadrangle 1:100,000 scale)

Dillon(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Big Hole(hydrologic unit)

Missouri Headwaters(hydrologic accounting unit)

Missouri Headwaters(hydrologic subregion)

Missouri(hydrologic region)

Geographic areas

Country State County
United States Montana Madison

Public Land Survey System information

Meridian Township Range Section Fraction State
Montana Principal 002S 007W 29 Montana

Comments on the location information

  • CENTER OF NE 1/4, SECTION 29

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Galena Gangue
Limonite Gangue
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) Oxidation

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss
    Rock unit name Pre Belt
    Rock description Pre Belt
    Stratigraphic age (youngest) Neoarchean
    Stratigraphic age (youngest) Neoarchean

Nearby scientific data

(1) -112.49005, 45.63601
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Rochester Fault Zone

Ore body information

  • Strike N 40 W
    Dip 90
    Length 2438.4M
    Width 182.88M
    Depth to top 0M

Controls for ore emplacement

  • Shear Zone

Comments on the geologic information

  • GEOL.DESC: QUARTZ MASS OR ZONE 600 FT. WIDE, 8000 FT. LONG.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Production years INTERMITTENT 1870-1930

Mining district

District name Rochester District

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner J. M. Comfort, M. C. Reyner
    First year 1950

Workings at the site

  • Type of workings Underground
    Overall depth 67.06M

Comments on the workings information

  • 220-FT VERTICAL SHAFT, DRIFTS, TRENCHES

Reference information

Bibliographic references

  • Deposit

    MBMG MEM 19, P. 46-47.

  • Deposit

    REYNER, M.L., 1950, DIRECTORY OF MINING PROPERTIES, 1949: MT. BUREAU OF MINES AND GEOL., MEMOIR 31, P. 63

  • Deposit

    CONSV. DIV. COMP. DATE, 03-31-1961

  • Deposit

    1950 GEOLMAP MBMG MEM. 1

  • Production

    MBMG MEM. 31

General comments

Subject category Comment text
Deposit SEVERAL DISTINCT PARALLEL VEINS.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1974 Unknown U.S. Geological Survey
Updater 01-JUN-1980 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.

External references

Maps centered on this site