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Broadwater Mine

Past Producer in Cascade county in Montana, United States with commodities Silver, Lead, Zinc, Copper, 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. Mineral occurrence model information
  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. Production statistics
  18. Workings at the site
  19. Links to other databases
  20. Bibliographic references
  21. Reporter information

Geologic information

Identification information

Deposit ID 10071380
MRDS ID W014725
Record type Site
Current site name Broadwater Mine
Related records 10172677

Geographic coordinates

Geographic coordinates: -110.72501, 46.93435 (WGS84)
Elevation 1963
Relative position ABOUT 1/3 MILE NE FROM NEIHART, MONTANA

Site location context

Political divisions (FIPS codes)

Cascade(county)

Montana(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Neihart(quadrangle 1:24,000 scale)

White Sulphur Springs(quadrangle 1:100,000 scale)

White Sulphur Springs(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Belt(hydrologic unit)

Upper Missouri(hydrologic accounting unit)

Missouri-Marias(hydrologic subregion)

Missouri(hydrologic region)

Federal lands

Helena-Lewis and Clark 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 Cascade

Public Land Survey System information

Meridian Township Range Section Fraction State
Montana Principal 014N 008E 32,33 Montana

Comments on the location information

  • DEPOSIT ON UNSURVEYED LAND, SECTION NUMBERS ESTIMATED U.T.M. COORDINATES TAKEN ON UPPER ADIT

Commodities

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

Materials information

Materials Type of material
Chalcopyrite Ore
Polybasite Ore
Proustite Ore
Pyrargyrite Ore
Pyrite Ore
Sphalerite Ore
Galena Ore
Barite Gangue
Quartz Gangue

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Rock unit name Snow Creek Porphyry-Pluton & Dikes Of Rhyolite Porphyry;Pinto Diorite-Large Phenocrysts Of Feldspar & Hornblende
    Rock description Snow Creek Porphyry-Pluton & Dikes Of Rhyolite Porphyry;Pinto Diorite-Large Phenocrysts Of Feldspar & Hornblende
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss
    Rock unit name Belt, Neihart Quartzite;Gneiss And Schist
    Rock description Belt, Neihart Quartzite;Gneiss And Schist

Nearby scientific data

(1) -110.72501, 46.93435
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Zone Of Igneous Intrusions Covering Over 800 Square Km.
Type of structure Local
Structure description Pre-Mineral Moulton Fault, Domal Uplift Caused By Intrusion Of Snow Creek Porphyry

Ore body information

  • General form TABULAR
    Strike ABOUT N 25 E
    Dip NEARLY VERTICAL
    Length 305M
    Width 91M
    Area 5.6HA
    Depth to top 135M

Controls for ore emplacement

  • Ore Confined To Well Defined Veins; Localized In Sheared & Breccia Zones Between Vein Walls.

Comments on the geologic information

  • VEIN REPORTEDLY SHOWS DISTINCT BANDING STRUCTURE BELIEVED DUE TO A SHEETING OF ALTERED COUNTRY ROCK. CRYSTALLINE PRECAMBRIAN ROCKS ARE PRE-BELT.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant Yes
Discovery year 1881
Year of first production 1886

Mining district

District name Neihart District

Ownership information

  • Type Owner-Operator
    Owner Peter S. Antonioli And Son
    Home office 1001 West Gold, Butte, Mt 59701

Production statistics

  • Year 1947
    Period 1940 - 1947
    Accuracy Accurate
    Description Cp_Grade: ^Approx. 0.03 %
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Copper Copper 0wt-pct
  • Year 1947
    Period 1940 - 1947
    Accuracy Accurate
    Description Cp_Grade: ^Approx. 0.007 Toz/St
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Gold Gold 0g/mt
  • Year 1947
    Period 1892 - 1947
    Accuracy Estimate
    Description Cp_Grade: ^3 To 60 Toz/St
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major ZN Zinc Zinc 45359.23mt
    Major PB Lead Lead 4535923.7mt
    Minor AU Gold Gold 24882.78g
    Minor CU Copper Copper 28046.52mt
    Major AG Silver Silver 93310443g 889g/mt

Comments on the production information

  • PRODUCTION RECORDS PRIOR TO 1940 SKETCHY. ESTIMATED VALUE OF PRODUCTION PRIOR TO 1940 IS $5,000,000, PRIMARILY IN SILVER. OVER 1,000,000 OZ AG PRODUCED PRIOR TO 1895.

Comments on the reserve resource information

  • LARGE PRODUCTION INDICATES THAT LITTLE OR NO ORE REMAINS ABOVE THE NO. 8 ADIT BUT THERE IS NO INDICATION OF THE VEIN PINCHING OUT AT DEPTH. RESOURCE ESTIMATE MADE BY ASSUMING THAT THE VEIN MAY BE MINED TO THE NO. 10 LEVEL FOR A LENGTH OF 1000 FT AND A WIDTH OF 3 FT. NONE OF THIS GROUND APPEARS TO HAVE BEEN STOPED SO IT IS PROBABLY RELATIVELY LOW GRADE.

Workings at the site

  • Type of workings Underground
    Length 3000M
    Overall depth 300M

Comments on the workings information

  • PROPERTY DEVELOPED BY 3 MAIN ADITS, THE LOWERMOST (NO. 8) BEING AT LEAST 2800 FT. LONG, TWO SHALLOW SHAFTS, A WINZE SUNK ABOUT 125 FT BELOW THE NO. 8 ADIT, AND NUMEROUS RAISES AND LEVELS.

Reference information

Bibliographic references

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1976 Mlynarczyk, Meg S. U.S. Geological Survey

Beyond USGS

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

External references

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