Terry & Terry No. 1 Claims

The Terry & Terry No. 1 Claims is a mica mine located in Custer county, South Dakota at an elevation of 5,240 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: Terry & Terry No. 1 Claims
Secondary: Thom Carroll Property

Commodity

Primary: Mica
Secondary: 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: Phillip Demming

Owner Name: John Ross And Kenneth Spring

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
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

Form: DIKE

Structure

Type: L
Description: Flat Fault 8 Feet Below Surface.

Alterations

Not available

Rocks

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

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

Analytical Data

Analytical Data: MICA COMPOSES AS MUCH AS 20 TO 25 PERCENT OF THE PEGMATITE

Materials

Ore: Mica

Comments

Comment (Production): LESS THAN 10 PERCENT WAS NO. 1 GRADE

Comment (Deposit): COMPOSITE OF TWO PEGMATITE DIKES

Comment (Workings): TWO SHAFTS AND ONE SMALL OPEN PIT. ONE SHAFT IS 50 FT DEEP BUT IS BACKFILLED TO 22 FEET BELOW THE SURFACE. THE OTHER SHAFT IS AN INCLINED SHAFT OF 18 FEET. SHORT DRIFTS WERE DRIVEN FROM THE DEEPER SHAFT, BUT ARE INACCESSIBLE.

References

Reference (Deposit): U.S. BUREAU OF MINES, 1954, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707

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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