Ladwig-Grosso Pegmatite

The Ladwig-Grosso Pegmatite is a mica and beryllium mine located in Jefferson county, Colorado at an elevation of 8,848 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

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Site Name

Primary: Ladwig-Grosso Pegmatite

Commodity

Primary: Mica
Primary: Beryllium
Tertiary: Feldspar
Tertiary: Quartz

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
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: Junction Ranch Fault Zone

Alterations

Not available

Rocks

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

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

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

Analytical Data

Not available

Materials

Ore: Beryl
Ore: Quartz
Ore: Muscovite

Comments

Comment (Location): NORTH OF ROBINSON GULCH. ELEV AND LAT-LONG GIVEN ARE FOR CENTER NE NE SEC. 18 ; INFO FROM LAND.ST :(1975)

Comment (Development): ORIGINAL CRIB RECORD CITES PRODUCTION OF FEW HUNDRED LB OF BE AND FEW TONS SCRAP MICA

Comment (Deposit): POORLY ZONED PEGMATITE PROBABLY TRENDS SUBPARALLEL TO ENE FOLIATION OF BIOTITE GNEISS, HORNBLENDE GNEISS, AND AMPHIBOLITE

Comment (Workings): SHALLOW OPEN CUT

References

Reference (Deposit): USBM MIN. EXAM. FILE, REPT. OF 1/26/59 (FROM ORIGINAL CRIB RECORD)

Reference (Deposit): MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 28

Reference (Deposit): SHERIDAN, D.M., AND OTHERS, 1967, GEOLOGY AND URANIUM DEPOSITS OF THE RALSTON BUTTES DISTRICT, JEFFERSON COUNTY, COLORADO: USGS PROF. PAPER 520 (INCL. GEOLOGIC MAP OF RALSTON BUTTES QUAD)

Colorado Mining Photos

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