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Broadgauge - Tamarack Mines

Producer in Madison county in Montana, United States with commodities 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. Geologic structures
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Ownership information
  17. Production statistics
  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 10070462
MRDS ID W013405
Record type Site
Current site name Broadgauge - Tamarack Mines
Related records 10221744

Geographic coordinates

Geographic coordinates: -112.13115, 45.48101 (WGS84)
Elevation 1865
Relative position APPROXIMATELY 4 1/2 MILES NORTHEAST OF SHERIDAN, MONTANA

Site location context

Political divisions (FIPS codes)

Madison(county)

Montana(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Sheridan(quadrangle 1:24,000 scale)

Dillon(quadrangle 1:100,000 scale)

Dillon(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Ruby(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 004S 004W 17 Montana

Comments on the location information

  • SW/4 OF SW/4 OF SECTION 17.

Commodities

Commodity Importance
Gold Primary
Silver Primary

Materials information

Materials Type of material
Pyrite Gangue

Alteration

  • (Local) Silicification, Ore Is Completely Oxidized

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Quartz Monzonite
    Rock unit name Quartz Monzonite Outlier Of Tobacco Root Batholith
    Rock description Quartz Monzonite Outlier Of Tobacco Root Batholith
    Stratigraphic age (youngest) Neoarchean
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Neoarchean
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Cherry Creek Series, Limestone-Gneiss
    Rock description Cherry Creek Series, Limestone-Gneiss

Nearby scientific data

(1) -112.13115, 45.48101
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Tobacco Root Batholith
Type of structure Local
Structure description Fractures Trending E-W, 30 E, (The Tamarack Vein), Regional Joint System Trends N30e, 45w (Broadgauge Vein)

Controls for ore emplacement

  • Important Vein Structure Lies Along Gneiss - Limestone Contact Or Within Adjacent Limestone; Faults Cut Veins

Comments on the geologic information

  • THE SIGNIFICANT DEPOSITS OCCUR ALONG SHEAR ZONES IN THE MARBLE, PARALLELING FOLIATION.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1875
Discoverer Alfred Cisler

Mining district

District name Sheridan (Mill Creek) District

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Holladay, R. L.
    Home office Box 302, Sheridan, Mt 59749
  • Type Owner
    Owner Broadgauge Mine Inc.
    Home office Box 302, Sheridan, Mt.

Production statistics

  • Year 1935
    Period 1890 - 1935
    Material AG
    Accuracy Estimate
    Description Cp_Grade: ^Approx. 0.05 % Oz/St
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Silver Silver 0wt-pct
  • Year 1935
    Period 1890 - 1935
    Material AU
    Accuracy Estimate
    Description Cp_Grade: ^Approx. 0.8 % Oz/St
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Gold Gold 1wt-pct

Comments on the production information

  • MOST EARLY PRODUCTION FROM BROADGAUGE VEIN, LATER FROM PRIMARILY TAMARACK VEIN

Workings at the site

  • Type of workings Surface/Underground
    Length 1219.2M
    Overall depth 137.16M

Comments on the workings information

  • LAWSON REPORTS PROPERTY AS DEVELOPING IN 1974. MINERALIZED ZONE OPNED BY THREE ADITS LEADING TO AN INCLINED WINZE.

Comments on development

  • ELECTRIC POWER, AMALGOMATION AND CONCENTRATION MILL

Reference information

Bibliographic references

  • Deposit

    MBMG MEM 9.

  • Deposit

    USBM IC 6972.

  • Deposit

    LAWSON, 1974, DIRECTORY OF MINING ENTERPRISES FOR 1974. MT. BUREAU OF MINES & GEOLOGY BULL. 95.

  • Deposit

    MBMG MEM 41, P. 17.

  • Production

    LORAIN, 1937, U. S. B. M. INF. CIRC. 6972.

General comments

Subject category Comment text
Deposit Discovery Year: 1870'S

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-1976 Mlynarczyk, Meg S.; Krohn, D. U.S. Geological Survey
Updater 01-MAY-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.

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