Jahnke Mine

The Jahnke Mine is a silver, lead, and copper mine located in Beaverhead county, Montana at an elevation of 8,780 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: Jahnke Mine
Secondary: Montana Oreway
Secondary: Straight Tip

Commodity

Primary: Silver
Primary: Lead
Primary: Copper
Secondary: Gold
Secondary: Tungsten

Location

State: Montana
County: Beaverhead
District: Beaverhead Range

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: Underground

Ownership

Owner Name: John L. Rankine

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: Vein
Operation Type: Unknown
Discovery Year: 1892
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: Beaverhead Mountains

Mineral Deposit Model

Not available

Orebody

Form: QUARTZ STRINGERS

Structure

Type: L
Description: Sill, As Much As 100-Ft. Wide

Alterations

Not available

Rocks

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

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

Analytical Data

Not available

Materials

Ore: Gold
Ore: Scheelite
Ore: Copper
Ore: Malachite
Ore: Bornite
Ore: Chalcopyrite
Ore: Cuprite
Ore: Galena
Gangue: Chlorite
Gangue: Epidote
Gangue: Quartz
Gangue: Magnetite
Gangue: Tourmaline
Gangue: Hematite
Gangue: Calcite

Comments

Comment (Production): FIGURES REFER TO A MINE CALLED STRAIGHT TIP. GEACH ASSUMES STRAIGHT TIP MINE IS THE JANKE.

Comment (Deposit): BEST ORE EXPOSURES OCCUR NEAR MOUNTAIN CREST, WHERE SEVERAL VEINS PARALLEL BEDDING AND INTERSECT VERTICAL VEINS.

Comment (Workings): 3064-FT ADIT DRIVEN IN 1909 FAILED TO INTERSECT VEIN. TWO INCLINED SHAFTS, 50 AND 150-FT. LONG, EXPLORED VEINS IN 1940-41.

Comment (Deposit): Discovery Year: EARLY 1890'S

Comment (Geology): DEPOSIT IN DIORITE SILL IN QUARTZITE.

Comment (Deposit): PROPERTY CONSISTS OF 5 PATENTED CLAIMS; THE GOOD HOPE, WABASH, MT. VERNON, RANGER, AND POTOMAC. ; INFO.SRC : 1 PUB LIT

References

Reference (Deposit): MBMG BULL 85.

Reference (Deposit): USBM RI 6334

Reference (Deposit): USGS BULL 574, P. 77.

Reference (Deposit): SASSMAN, O., 1941 MA THESIS, MT STATE UNIV., P. 280

Reference (Deposit): 1914 RECON WINCHELL, A.N., U.S.G.S. BULL. 574

Reference (Deposit): 1972 COMPILE M.B.M.G. BULL. 85

Reference (Production): GEACH, 1972, MBMG BULL. 85.

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.