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
Elevation: 8,848 Feet (2,697 Meters)
Commodity: Mica, Beryllium
Lat, Long: 39.79639, -105.27056
Map: View on Google Maps
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.
Ladwig-Grosso Pegmatite MRDS details
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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