The Jefferyes Group is a tungsten mine located in Park county, Colorado at an elevation of 8,301 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: 8,301 Feet (2,530 Meters)
Commodity: Tungsten
Lat, Long: 39.04111, -105.39389
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.
Jefferyes Group MRDS details
Site Name
Primary: Jefferyes Group
Commodity
Primary: Tungsten
Location
State: Colorado
County: Park
District: Tarryall Springs District (Puma City)
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.
Holdings
Not available
Workings
Not available
Ownership
Owner Name: Lynn Jefferyes
Years: 1956 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Deposit Type: Vein
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: LENSOID, TABULAR, PODS
Structure
Type: R
Description: Front Range, Tarryall Mountains, Puma Hills
Type: L
Description: Lake George Ring Dike Complex, Nw-Trending Faults
Alterations
Not available
Rocks
Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock
Age Young: Neoproterozoic
Name: Quartz Monzonite
Role: Associated
Age Type: Host Rock
Age Young: Neoproterozoic
Name: Quartz Monzonite
Role: Associated
Age Type: Host Rock Unit
Age Young: Neoproterozoic
Analytical Data
Not available
Materials
Ore: Scheelite
Gangue: Epidote
Gangue: Wollastonite
Gangue: Garnet
Gangue: Quartz
Gangue: Clinozoisite
Gangue: Chlorite
Gangue: Vesuvianite
Comments
Comment (Location): ONE MILE WEST OF STATE HWY 77, 6 MILES NW OF LAKE GEORGE (BELSER, 1956) ; INFO FROM LAND.ST :1976
Comment (Commodity): SCHEELITE OCCURS AS CRYSTALS, GRAINS, FLAKES, COATINGS
Comment (Workings): CUTS, PITS, SHORT ADITS, SHALLOW SHAFTS
References
Reference (Deposit): BELSER, CARL, 1956, TUNGSTEN POTENTIAL IN CHAFFEE, FREMONT; GUNNISON, LAKE, LARIMER, PARK, AND SUMMIT COUNTIES, COLORADO: USBM INFORMATION CIRCULAR 7748, P. 19-26
Reference (Deposit): HEINRICH, E.W., 1981, PRECAMBRIAN TUNGSTEN AND COPPER-ZINC SKARN DEPOSITS OF SOUTH-CENTRAL COLORADO: CGS RESOURCE SERIES 21, 115 P.
Reference (Deposit): BRYANT, BRUCE, MCGREW, L.W. AND WOBUS, R.A., 1981, GEOLOGIC MAP OF THE DENVER 1 DEGREE X 2 DEGREES QUADRANGLE, NORTH-CENTRAL COLORADO: USGS MAP I-1163, 1:250,000
Colorado Mining Photos
Check out this collection of Colorado's best historic mining photos: Incredible Photos of Colorado Mining Scenes.
