Nellie-Mascot Group

The Nellie-Mascot Group is a gold, silver, and lead mine located in Jefferson county, Montana at an elevation of 7,201 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: Nellie-Mascot Group

Commodity

Primary: Gold
Primary: Silver
Primary: Lead

Location

State: Montana
County: Jefferson
District: Homestake District

Land Status

Land ownership: National Forest
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: Underground

Ownership

Owner Name: Brown, Bill, Homestake

Owner Name: Templeton, J.L.
Home Office: Butte, Mt.

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: Vein
Operation Type: Unknown
Year First Production: 1911
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Type: R
Description: Boulder Batholith

Alterations

Not available

Rocks

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

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: Late Cretaceous

Analytical Data

Not available

Materials

Ore: Silver
Gangue: Quartz

Comments

Comment (Commodity): QUARTZ VEIN HIGH IN SILVER

Comment (Location): SW/4 OF NW/4 OF SECT. 5

Comment (Production): 8 PRODUCTION YEARS. MAIN PRODUCTION IN 1911-1916. OWNER REPORTS $15,000 PRODUCTION AS OF 1935.

Comment (Development): GASOLINE-DRIVEN COMPRESSOR.

Comment (Workings): 2 50 FT SHAFTS AND 6 ADITS; 150, 100, 1000, 700, 300, AND 700 FT. 2000 FT OF DRIFTS, 400 FT OF CROSSCUTS AND 300 FT OF RAISES

Comment (Geology): QUARTZ VEIN CUTS AN APLITE FACIES OF THE BOULDER BATHOLITH.

References

Reference (Deposit): 1960 RECON MONT. BUREAU OF MINES AND GEOL. BULL. 1

Reference (Production): MBMG BULLETIN 16.

Reference (Deposit): GILBERT, F.C., 1935, DIRECTORY OF MINING PROPERTIES: MONTANA BUREAU OF MINES AND GEOLOGY MEMOIR 15, P. 30.

Reference (Deposit): MBMG BULL 16.

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.