Dewey Group

The Dewey Group is a gold and silver mine located in Grand county, Utah at an elevation of 11,401 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: Dewey Group

Commodity

Primary: Gold
Primary: Silver
Secondary: Copper
Tertiary: Fluorine-Fluorite

Location

State: Utah
County: Grand
District: La Sal Mtn.

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

Type: Unknown

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Discovery Year: 1898
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Intermontane Plateaus
Physiographic Province: Colorado Plateaus
Physiographic Section: Canyon Lands
Physiographic Detail: La Sal Mountains

Mineral Deposit Model

Not available

Orebody

Form: TABULAR

Structure

Not available

Alterations

Not available

Rocks

Name: Syenite
Role: Host
Age Type: Host Rock
Age Young: Pliocene

Name: Syenite
Role: Host
Age Type: Host Rock Unit
Age Young: Pliocene

Analytical Data

Not available

Materials

Ore: Chrysocolla
Ore: Malachite
Ore: Fluorite
Ore: Chalcopyrite
Gangue: Hedenbergite
Gangue: Quartz
Gangue: Hematite
Gangue: Pyrite
Gangue: Chalcedony
Gangue: Calcite

Comments

Comment (Location): SECTION SUBDIVISION: NE 1/4 NW 1/4 OF SEC. 25

Comment (Workings): THREE ADITS, THE MAIN ADIT IS PARTLY CAVED AND INACCESSIBLE. THE OTHER TWO ARE CAVED AT PORTAL

References

Reference (Reserve-Resource): MC CARTHY, B.M., 1977

Reference (Deposit): 1976 RECON UTAH GEOL. & MIN SURVEY - BULLETIN 11

Reference (Deposit): HUNT, C.B., 1958 , STRUCTURE AND IGNEOUS ROCKS OF THE LA SAL MTNS., UT.: USGS PROF PAPER 294-I

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