Unnamed Pegmatite

The Unnamed Pegmatite is a mine located in Gunnison county, Colorado at an elevation of 8,176 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: Unnamed Pegmatite

Commodity

Tertiary: Molybdenum
Tertiary: Iron

Location

State: Colorado
County: Gunnison
District: Wolf Creek Area

Land Status

Land ownership: BLM Administrative Area
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: Occurrence
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

Not available

Structure

Type: R
Description: Gunnison Uplift, San Juan Volcanic Field

Type: L
Description: Gunnison Gold Belt, Unnamed Fault, Tolvar Peak Stock

Alterations

Not available

Rocks

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

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

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

Analytical Data

Not available

Materials

Ore: Molybdenite
Gangue: Quartz
Gangue: Microcline
Gangue: Hornblende
Gangue: Sphene

Comments

Comment (Deposit): SMALL STOCK OF PORPHYRITIC AUGITE SYENITE INTRUDES COMPLEX OF SCHIST AND GNEISS CONTAINING LAYERS OF AMPHIBOLITE AND HORNBLENDE SCHIST WITH BEDDING AND FOLIATION TRENDING GENERALLY EAST-WEST, DIPPING SOUTH. SYENITE INTRUDED BY GRANITE DIKES, QUARTZ VEINS, AND LEUCOSYENITE. ON PERIPHERY OF MAIN MASS ARE SMALL BODIES OF APPARENTLY OLDER MELASYENITE. NW OF STOCK IS SWARM OF NE-TRENDING GRANITE-QUARTZ MONZONITE DIKES. NORTH END OF STOCK IS OFFSET BY FAULT TRENDING GENERALLY N 35 E AND WITH APPARENT RIGHT LATERAL MOVEMENT. ALTHOUGH NO PEGMATITES WERE MAPPED IN IMMEDIATE AREA (HEDLUND AND OLSON, 1973) HUNTER (1925) DESCRIBED A 2-FT-WIDE DIKE ON WEST BORDER OF STOCK CONSISTING OF QUARTZ, MICROCLINE, AND LONG SLENDER HORNBLENDE CRYSTALS, WITH ABUNDANT SPECULAR HEMATITE. MOLYBDENITE IS ASSOCIATED WITH HORNBLENDE AND OCCURS ALONG CRACKS AND JOINTS IN QUARTZ.

Comment (Location): EXACT LOCATION UNCERTAIN, HUNTER (1925) GIVES LOCATION AS ABOVE STREAM CROSSING ON WILDCAT GULCH ON WEST BORDER OF AUGITE SYENITE BODY. NEW BASE MAP SHOWS WOLF CREEK AND WILDCAT GULCH REVERSED FROM THAT ON HUNTER'S MAP. SYENITE BODY LIES ON WOLF CREEK ABOUT 1.7 MILES EAST OF CONFLUENCE WITH CEBOLLA CREEK. GEOLOGIC MAP SHOWS NO PEGMATITE IN IMMEDIATE AREA. ELEV AND LAT-LONG GIVEN ARE FOR POINT ABOVE (SOUTH OF) TRAIL ACROSS WOLF CREEK AND NEAR CONTACT OF MAIN SYENITE MASS WITH SMALL PERIPHERAL BODY OF MELASYENITE IN SE SW SE SEC. 19. ; INFO FROM LAND.ST :1975

References

Reference (Deposit): HUNTER, J.F., 1925, PRE-CAMBRIAN ROCKS OF GUNNISON RIVER, COLORADO: USGS BULL. 777, P. 79.

Reference (Deposit): HEDLUND, D.C., AND OLSON, J.C., 1973, GEOLOGIC MAP OF THE CARPENTER RIDGE QUADRANGLE, GUNNISON COUNTY, COLORADO: USGS MAP GQ-1070.

Colorado Mining Photos

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