Crown Mine

The Crown Mine is a mica and beryllium mine located in Custer county, South Dakota at an elevation of 5,741 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: Crown Mine
Secondary: Mcmackin Mine

Commodity

Primary: Mica
Primary: Beryllium
Tertiary: Feldspar
Tertiary: Tantalum

Location

State: South Dakota
County: Custer
District: Custer 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: Surface/Underground

Ownership

Owner Name: New York Holding Co.

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1879
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

Form: DIKE

Structure

Type: L
Description: Anticlinal Fold That Strikes Northwest And Dips South

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
Age Young: Neoproterozoic

Analytical Data

Not available

Materials

Ore: Feldspar
Ore: Muscovite
Ore: Beryl
Gangue: Triphylite
Gangue: Quartz
Gangue: Tourmaline
Gangue: Siderite

Comments

Comment (Geology): MICA IS IN PART AIR STAINED AND SOME OF IT SHOWS RULING AND 'A' STRUCTURE

Comment (Deposit): SAME DIKE AS THE BALLARD MINE

Comment (Workings): AN OPENCUT, SEVERAL OLD INCLINES, A SHAFT, AND NUMEROUS DRIFTS AND STOPES.

Comment (Commodity): MICA IS PALE TO RUBY MICA

Comment (Location): NE 1/4, ON THE NORTHERN TRIBUTARY OF RUBY CREEK.

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): FISHER, D.J., 1945, PRELIMINARY REPORT ON SOME OF THE PEGMATITES NEAR CUSTER, SOUTH DAKOTA GEOLOGICAL SURVEY REPORT OF INVESTIGATIONS 50

Reference (Deposit): STERRET, D.B., 1923, MICA DEPOSITS OF THE UNITED STATES, U.S. GEOLOGICAL SURVEY BULLETIN 740

Reference (Deposit): U.S. GEOLOGICAL SURVEY, U.S. BUREAU OF RECLAMATION, AND SOUTH DAKOTA GEOLOGICAL SURVEY, 1975, MINERAL AND WATER RESOURCES OF SOUTH DAKOTA, SOUTH DAKOTA GEOLOGICAL SURVEY BULLETIN 16 / ROBERTS, W.L., AND RAPP, GEORGE, 1965, MINERALOGY OF THE BLACK HILLS, SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY BULLETIN 18

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