Broadwater Mine

The Broadwater Mine is a silver, lead, and zinc mine located in Cascade county, Montana at an elevation of 6,440 feet.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Broadwater Mine

Commodity

Primary: Silver
Primary: Lead
Primary: Zinc
Secondary: Copper
Secondary: Gold

Location

State: Montana
County: Cascade
District: Neihart District

Land Status

Not available

Holdings

Not available

Workings

Type: Underground

Ownership

Owner Name: Peter S. Antonioli And Son
Home Office: 1001 West Gold, Butte, Mt 59701

Production

Year: 1947
Time Period: 1940 - 1947
Description: Cp_Grade: ^Approx. 0.03 %
Year: 1947
Time Period: 1940 - 1947
Description: Cp_Grade: ^Approx. 0.007 Toz/St
Year: 1947
Time Period: 1892 - 1947
Description: Cp_Grade: ^3 To 60 Toz/St

Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: Polymetallic veins
Operation Type: Unknown
Year First Production: 1886
Discovery Year: 1881
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: Y
Deposit Size: S

Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains
Physiographic Detail: Little Belt Mountains

Mineral Deposit Model

Model Name: Polymetallic veins

Orebody

Form: TABULAR

Structure

Type: R
Description: Zone Of Igneous Intrusions Covering Over 800 Square Km.

Type: L
Description: Pre-Mineral Moulton Fault, Domal Uplift Caused By Intrusion Of Snow Creek Porphyry

Alterations

Not available

Rocks

Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Name: Diorite
Role: Associated
Age Type: Host Rock
Age Young: Neoproterozoic

Analytical Data

Not available

Materials

Ore: Pyrite
Ore: Galena
Ore: Pyrargyrite
Ore: Sphalerite
Ore: Polybasite
Ore: Proustite
Ore: Chalcopyrite
Gangue: Barite
Gangue: Quartz

Comments

Comment (Location): DEPOSIT ON UNSURVEYED LAND, SECTION NUMBERS ESTIMATED U.T.M. COORDINATES TAKEN ON UPPER ADIT

Comment (Reserve-Resource): 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.

Comment (Workings): 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.

Comment (Geology): VEIN REPORTEDLY SHOWS DISTINCT BANDING STRUCTURE BELIEVED DUE TO A SHEETING OF ALTERED COUNTRY ROCK. CRYSTALLINE PRECAMBRIAN ROCKS ARE PRE-BELT.

Comment (Production): 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.

References

Reference (Deposit): SCHAFER, 1935, GEOLOGY & ORE DEPOSITS - NEIHART MINING DISTRICT, CASCADE COUNTY, MONTANA, MT BUREAU MINES & GEOL. MEM. 13.

Reference (Deposit): LAWSON, 1976, DIRECTORY OF MINING ENTERPRISES FOR 1975, MONTANA BUREAU MINES & GEOLOGY BULL. 100.

Reference (Deposit): ROBERTSON, A. F., 1951, MINES & MINERAL DEPOSITS - CASCADE COUNTY, U.S. BUREAU MINES INF. CIRC. 7589.

Reference (Deposit): KLEINKOPF, M. D., WITKIND, I. J., AND KEEFER, W. R., 1972, AEROMAGNETIC, BOUGUER GRAVITY, AND GENERALIZED GEOLOGIC MAPS OF THE CENTRAL PART OF THE LITTLE BELT MOUNTAINS, MONTANA: U.S. GEOLOGICAL SURVEY MAP GP-837.

Reference (Production): ROBERTSON, 1951, U.S.B.M. INF. CIRC. 7589.

Principal Gold Districts of Montana

In Montana, 54 mining districts have each have produced more than 10,000 ounces of gold. The largest producers are Butte, Helena, Marysville, and Virginia City, each having produced more than one million ounces. Twenty seven other districts are each credited with between 100,000 and one million ounces of gold production. Read more: Principal Gold Districts of Montana.