Mount Washington Mine

The Mount Washington Mine is a gold, lead, copper, and silver mine located in Jefferson county, Montana at an elevation of 6,719 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: Mount Washington Mine

Commodity

Primary: Gold
Primary: Lead
Primary: Copper
Primary: Silver
Secondary: Zinc
Tertiary: Arsenic
Tertiary: Bismuth
Tertiary: Antimony

Location

State: Montana
County: Jefferson
District: Colorado (Corbin-Wickes) 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: L. H. And L. Mining Co.,
Home Office: Grand Junction, Co.

Production

Year: 1951
Time Period: 1902-1951 0.15%
Material type: CU
Description: Cp_Grade: ^3.1 %

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Discovery Year: 1891
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

Mineral Deposit Model

Not available

Orebody

Form: IRREGULAR LENS-LIKE SHOOTS

Structure

Type: R
Description: Boulder Batholith, South - Trending Syncline In Elkhorn Mountains Volcanics

Type: L
Description: Quartz Latite Dikes And Plugs, Strong Fault Zone Called Big Fault Cuts Both Veins And Dike, Strike Faults Border Both Veins And Cross Them

Alterations

Alteration Type: L
Alteration Text: Extensive Alteration To Sericite

Rocks

Name: Tuff
Role: Associated
Age Type: Host Rock
Age Young: Late Cretaceous

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

Analytical Data

Analytical Data: 0.06 OZ/TON AU, 7.4 OZ/TON AG, 4% PB, 0.15 % CU, 3.1% ZN. ORE FROM FROM CLARK WINZE BETWEEN 800 AND 1000 FT LEVEL AVG. 20 OZ/TON AG, 6% ZN, LESS PB.

Materials

Ore: Galena
Ore: Tetrahedrite
Ore: Gold
Ore: Bismuth
Ore: Sphalerite
Ore: Chalcopyrite
Gangue: Tourmaline
Gangue: Pyrite
Gangue: Quartz
Gangue: Chalcedony

Comments

Comment (Deposit): ORE OCCURS IN A STRONG VEIN WHICH FOR MOST OF ITS LENGTH IS SPLIT BY A POST ORE QUARTZ LATITE DIKE. THE PART OF THE VEIN N OF THE DIKE HAS YIELDED THE MOST ORE. THE N VEIN IS AS MUCH AS 25 FT WIDE AND DIPS STEEPLY TO THE N, EXCEPT BETWEEN THE 200 AND 300 FT LEVEL WHERE IT DIPS STEEPY S, BELOW THE 500 FT LEVEL IT IS NEARLY VERTICAL. THE S VEIN AVERAGES 7 FT IN WIDTH BUT AT W END OF 800 LEVEL IT IS 45 FT WIDE

Comment (Reserve-Resource): TOTAL STOPED AREAS SHOWN ON MINE MAP TOTAL 180,000 ST ASSUMING AVERAGE VEIN THICKNESS OF 7 FT. TOTAL MINERALIZED ROCK ABOVE 1000 LEVEL IS 800,000 ST FOR AN AREA 1400 FT LONG BY 1000 FT DEEP BY 7 FT WIDE. ASSUMING 200,000 ST OF WASTE HAS BEEN REMOVED, AT LEAST 400,000 ST MINERALIZED GROUND SHOULD BE PRESENT. CUTOFF GRADE APPEARS TO HAVE BEEN ABOUT 4 TOZ/ST AG AND 3% PB. ASSUMED GRADE IS HALF THIS. DEEPER EXPLORATION, PARTICULARLY ON THE SHOOT ABOUT 400 FT. WEST OF THE HOMESTAKE SHAFT, MAY DISCOVER ADDITIONAL ORE BODIES.

Comment (Location): UTM LOCATION OF MOUNT WASHINGTON SHAFT ; INFO FROM LAND.ST :(1950)

Comment (Development): 6 CLAIMS: KEYSTONE, MOUNT WASHINGTON, MONONGAHELA, IRON MASK, HOMESTAKE, HANDY ANDY, 1 PLACER.

Comment (Deposit): DEER TUNNEL IS PART OF THE BLIZZARD MINE CLAIMS

Comment (Geology): QUARTZ LATITE DIKE THAT SPLITS VEIN PROBABLY CONNECTS AT EITHER END WITH TWO PLUGS OF QUARTZ LATITE THAT CUT THE SHEAR ZONE. DIKE AVERAGES 25 FT. THICK.

Comment (Workings): MINE IS DEVELOPED BY 1000 FT SHAFT (HOMESTAKE) AND 10 LEVELS, ALL ABOUT 100 FT APART. THE 8TH LEVEL IS OPENED TO THE SURFACE BY A 1900 FT CROSSCUT (DEER TUNNEL) IN A CANYON TO THE NE. (CAVED). IT WAS THE MAIN HAULAGEWAY FOR THE MINE. ANOTHER SHAFT TO EXPLORE S VEIN AND AN ADIT.

References

Reference (Deposit): USGS PP 428, P. 20, 40, 49, 69, 73, PL. 1.

Reference (Production): MBMG BULL. 16

Reference (Deposit): MBMG BULL 16, P. 52, 109.

Reference (Deposit): USGS BULL 842, P. 236-37.

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.