Spokane Mine

The Spokane Mine is a silver and gold mine located in Custer county, South Dakota at an elevation of 4,554 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: Spokane Mine

Commodity

Primary: Silver
Primary: Gold
Secondary: Zinc
Secondary: Lead

Location

State: South Dakota
County: Custer
District: Unorganized 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.
Administrative Organization: Black Hills National Forest

Holdings

Not available

Workings

Type: Underground

Ownership

Owner Name: Iron Mountain Development Co.

Production

Not available

Deposit

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

Physiography

General Physiographic Area: Interior Plains
Physiographic Province: Great Plains Province
Physiographic Section: Black Hills

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Name: Pegmatite
Role: Associated
Age Type: Associated Rock
Age Young: Neoproterozoic

Name: Pegmatite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Neoproterozoic

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

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

Analytical Data

Analytical Data: TWO CARLOADS WERE ASSAYED AT $23.00 A TON IN 1898.

Materials

Ore: Chalcopyrite
Ore: Argentite
Ore: Galena
Gangue: Pyrite
Gangue: Anglesite
Gangue: Quartz
Gangue: Vanadinite

Comments

Comment (Deposit): THREE ORE SHOOTS ARE PRESENT ALONG THE FISSURE VEIN WHICH IS CONFORMABLE WITH THE ENCLOSING SCHIST, EXCEPT WHERE IT CUTS A SMALL PEGMATITE.

Comment (Workings): THE MAIN ORE SHOOT IS DEVELOPED BY A SHAFT AND DRIFTS AT THE 60, 100, 200, AND 300 FOOT LEVELS. A SECOND SHOOT IS DEVELOPED BY A 41 FOOT RAISE AND A 50 FOOT WINCE. THE THIRD SHOOT IS UNDEVELOPED.

Comment (Geology): SILVER AND GOLD ARE ASSOCIATED WITH THE GALENA, SOME GOLD IS ALSO ASSOCIATED WITH THE PYRITE.

Comment (Location): SW 1/4, SW 1/4, SW 1/4

Comment (Development): SPOKANE GROUP IS 15 CLAIMS COVERING 100 ACRES IN SECS. 26, 27 AND 35.

References

Reference (Deposit): U. S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707

Reference (Deposit): FUERSTENAU, R.K., 1954, THE GEOLOGIC STRUCTURE OF THE SPOKANE MINING AREA, B.S. THESIS, SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY

Reference (Deposit): ROBERTS, W.L., AND RAPP, GEORGE, 1965, MINERALOGY OF THE BLACK HILLS, SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY BULLETIN 18

Reference (Production): U.S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707

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