Ermont Mines

The Ermont Mines is a gold and copper mine located in Beaverhead county, Montana at an elevation of 6,381 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: Ermont Mines
Secondary: Ermont No. 2 Ermont No. 19

Commodity

Primary: Gold
Primary: Copper
Secondary: Silver
Tertiary: Antimony

Location

State: Montana
County: Beaverhead
District: Argenta District

Land Status

Land ownership: BLM Administrative Area
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: R. A. Wellborn Grant, Montana

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1932
Discovery Year: 1926
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

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

Mineral Deposit Model

Not available

Orebody

Form: IRREGULAR

Structure

Type: R
Description: East Flank Of Humbolt Mountain Anticline

Type: L
Description: Fracture Zone Containing Ore Of No. 19 Mine

Alterations

Alteration Type: L
Alteration Text: Strong Alteration Of Dolomite No. 2 Mine, See N85

Rocks

Name: Andesite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Pliocene

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

Name: Andesite
Role: Associated
Age Type: Host Rock
Age Young: Late Devonian

Analytical Data

Not available

Materials

Not available

Comments

Comment (Workings): NO LENGTH OF UNDERGROUND WORKINGS. QUOTED DEPTH BELOW SURFACE FOR NO. 2 MINE APPROXIMATED DEPTH OF 300 FEET AND NO. 19 MINE DEPTH OF 500 FEET. THE NO. 2 MINE IS LOCATED AT THE SITE OF THE SURFACE MINE

Comment (Geology): ALTERATION IS PRESENT IN THE ANDESITE AT THE NO. 19 MINE

Comment (Location): ERMONT #2 ADIT USED FOR LOCATION - SEE GENERAL COMMENTS

Comment (Commodity): STIBNITE IS ASSOCIATED WITH ORE BODIES OF NO. 2 MINE STATED AS NOT COMMERCIALLY IMPORTANT (KELLEY, 1942), THERE MUST EXIST AN UNIDENTIFIED COPPER CONTAINING MINERAL RESPONSIBLE FOR PRODUCTION OF COPPER RECLAIMED FROM ORE IN THESE MINES.

Comment (Production): PRODUCTION RECORDED IN FOLLOWING YEARS; 1932 - 33 , 1935 - 42 , 1949 - 50 , 1963 , THOSE VALUES LISTED IN CUMULATIVE PRODUCTION INDICATE THESE YEARS OF PRODUCTION

Comment (Deposit): THE DESCRIPTIONS ABOVE PERTAIN TO THE FRACTURE ZONE NOT TO THE DISSEMINATED AREA. THE DISSEMINATED ORE WAS MINED BY BOTH SURFACE AND UNDERGROUND WORKINGS

Comment (Deposit): THE NO. 2 MINE CONTAINS DISSEMINATED ORE WITHIN ALTERED DOLOMITE. THE NO. 2 MINE IS ALSO THE SITE OF THE OPEN PIT THE NO. 19 MINE CONTAINS DISSEMINATED ORE AND VEINLETS, BOTH ONLY WITHIN THE ALTERED ANDESITE FRACTURE ZONE.

References

Reference (Deposit): KELLY, J.L., 1941 M.S. THESIS, MT SCHOOL OF MINES.

Reference (Deposit): MBMG BULL 85, P. 48.

Reference (Deposit): MBMG BULL 6, P. 69-70.

Reference (Production): GEACH, RD, 1972 , MINES AND MINERAL DEPOSITS (EXCEPT FUELS) BEAVERHEAD CO., MONT.

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.