Broadgauge - Tamarack Mines

The Broadgauge - Tamarack Mines is a gold and silver mine located in Madison county, Montana at an elevation of 6,119 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: Broadgauge - Tamarack Mines

Commodity

Primary: Gold
Primary: Silver

Location

State: Montana
County: Madison
District: Sheridan (Mill Creek) District

Land Status

Land ownership: Private
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Type: Surface/Underground

Ownership

Owner Name: Broadgauge Mine Inc.
Home Office: Box 302, Sheridan, Mt.

Owner Name: Holladay, R. L.
Home Office: Box 302, Sheridan, Mt 59749

Production

Year: 1935
Time Period: 1890 - 1935
Material type: AG
Description: Cp_Grade: ^Approx. 0.05 % Oz/St
Year: 1935
Time Period: 1890 - 1935
Material type: AU
Description: Cp_Grade: ^Approx. 0.8 % Oz/St

Deposit

Record Type: Site
Operation Category: Producer
Operation Type: Unknown
Discovery Year: 1875
Discovery Method: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains
Physiographic Detail: Tobacco Root Mountains

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Type: R
Description: Tobacco Root Batholith

Type: L
Description: Fractures Trending E-W, 30 E, (The Tamarack Vein), Regional Joint System Trends N30e, 45w (Broadgauge Vein)

Alterations

Alteration Type: L
Alteration Text: Silicification, Ore Is Completely Oxidized

Rocks

Name: Quartz Monzonite
Role: Associated
Age Type: Host Rock Unit
Age Young: Neoarchean

Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Late Cretaceous

Name: Quartz Monzonite
Role: Associated
Age Type: Host Rock
Age Young: Neoarchean

Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous

Analytical Data

Not available

Materials

Gangue: Pyrite

Comments

Comment (Development): ELECTRIC POWER, AMALGOMATION AND CONCENTRATION MILL

Comment (Workings): LAWSON REPORTS PROPERTY AS DEVELOPING IN 1974. MINERALIZED ZONE OPNED BY THREE ADITS LEADING TO AN INCLINED WINZE.

Comment (Geology): THE SIGNIFICANT DEPOSITS OCCUR ALONG SHEAR ZONES IN THE MARBLE, PARALLELING FOLIATION.

Comment (Location): SW/4 OF SW/4 OF SECTION 17.

Comment (Production): MOST EARLY PRODUCTION FROM BROADGAUGE VEIN, LATER FROM PRIMARILY TAMARACK VEIN

Comment (Deposit): Discovery Year: 1870'S

References

Reference (Deposit): MBMG MEM 9.

Reference (Deposit): USBM IC 6972.

Reference (Deposit): LAWSON, 1974, DIRECTORY OF MINING ENTERPRISES FOR 1974. MT. BUREAU OF MINES & GEOLOGY BULL. 95.

Reference (Deposit): MBMG MEM 41, P. 17.

Reference (Production): LORAIN, 1937, U. S. B. M. INF. CIRC. 6972.

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.