Silver Glen Ranch Pegmatite

The Silver Glen Ranch Pegmatite is a feldspar and mica mine located in Jefferson county, Colorado at an elevation of 7,139 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: Silver Glen Ranch Pegmatite

Commodity

Primary: Feldspar
Primary: Mica
Secondary: Niobium (Columbium)
Secondary: Tantalum
Secondary: Beryllium
Tertiary: REE
Tertiary: Thorium

Location

State: Colorado
County: Jefferson
District: Clear Creek Pegmatite Province

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

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1945
Year Last Production: 1956
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains

Mineral Deposit Model

Not available

Orebody

Form: TABULAR

Structure

Type: R
Description: Front Range Uplift, Denver Basin

Type: L
Description: Floyd Hill Fault Zone, Unnamed Overturned Anticline

Alterations

Not available

Rocks

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

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

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

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

Analytical Data

Not available

Materials

Ore: Microcline
Ore: Thorite
Ore: Monazite
Ore: Columbite
Ore: Microlite
Ore: Beryl
Ore: Cleavelandite
Ore: Bertrandite
Gangue: Garnet
Gangue: Topaz

Comments

Comment (Location): ON SE SIDE OF SWEDE GULCH ONE MILE ABOVE CONFLUENCE WITH BEAR CREEK ; INFO FROM LAND.ST :(1975)

Comment (Production): PRESUMED CUMULATIVE PRODUCTION

Comment (Development): OPENED ABOUT 1945 AND MINED FOR FELDSPAR AND MICA; NO MINING SINCE 1947, BUT USBM (?) REPORTS CUMULATIVE PRODUCTION THROUGH 1956.

Comment (Deposit): WELL-ZONED PEGMATITE HAS WALL ZONE OF DULL PLAGIOCLASE AND MICROCLINE WITH FESTOONED HERRINGBONE MICA FANNING INTO QUARTZ CORE

Comment (Workings): OPEN CUT

References

Reference (Deposit): BOOS, M.F., 1954, GENESIS OF PRECAMBRIAN PEGMATITES IN THE DENVER MOUNTAIN PARKS AREA, COLORADO: GSA BULL., V. 65, P. 115-142

Reference (Deposit): SHERIDAN, D.M., AND OTHERS, 1972, GEOLOGIC MAP OF THE EVERGREEN QUADRANGLE, JEFFERSON COUNTY, COLORADO: USGS MAP I-786-A

Reference (Deposit): MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 29.

Reference (Deposit): USBM MIN. EXAM. FILE, REPT. OF 6/1/59 (FROM ORIGINAL CRIB RECORD)

Reference (Production): ORIGINAL CRIB RECORD (PROBABLY USBM REFERENCE)

Colorado Mining Photos

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