Dean Mine

The Dean Mine is a gold and silver mine located in Lander county, Nevada at an elevation of 8,202 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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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: Dean Mine
Secondary: Cumberland Mine

Commodity

Primary: Gold
Primary: Silver
Tertiary: Lead
Tertiary: Zinc
Tertiary: Iron
Tertiary: Copper

Location

State: Nevada
County: Lander
District: Lewis District

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

Owner Name: St. George Metals, Inc.
Info Year: 1997

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: vein
Operation Type: Surface-Underground
Years of Production:
Organization:
Significant: Y
Deposit Size: S

Physiography

Not available

Mineral Deposit Model

Model Name: Distal disseminated Ag-Au

Orebody

Form: tabular

Structure

Type: L
Description: Laramide faulting; Dean Mine fault

Type: R
Description: Roberts Mountains Thrust at depth

Alterations

Alteration Type: L
Alteration Text: sericitic, pyritic, propylitic

Rocks

Name: Granodiorite
Role: Associated
Age Type: Associated Rock
Age Young: Tertiary

Name: Granodiorite
Role: Host
Age Type: Host Rock
Age Young: Tertiary

Name: Quartzite
Role: Host
Age Type: Host Rock
Age Young: Ordovician

Name: Shale
Role: Host
Age Type: Host Rock
Age Young: Ordovician

Analytical Data

Not available

Materials

Ore: Gold
Ore: Galena
Ore: Sphalerite
Ore: Pyrite
Ore: Arsenopyrite
Ore: Chalcopyrite
Gangue: Quartz
Gangue: Calcite
Gangue: Barite

Comments

Comment (Commodity): Ore Materials: free gold, galena, sphalerite, pyrite, arsenopyrite, chalcopyrite

Comment (Commodity): Gangue Materials: quartz, calcite, barite

Comment (Deposit): The mineralization occurs in three veins: the Cumberland, the Morning Star and the Pittsburg.

Comment (Development): The history of the Dean Mine parallels that of the adjacent Hilltop District whose mines follow the same veins. The mine has been developed by numerous adits, shafts and other workings since the 1890s. Lessee C. B. Lancaster was mining ore here in 1938. In 1994, St. George Metals did exploration and development drifting at the Dean mine and stoping to mine about 5,000 tons of high-grade ore that had been blocked out earlier. The vein segment mined was 3 to 3.5 feet wide and 165 feet long with a 52? dip. The vein averaged in excess of 1 ounce of gold per ton . In 1995, Idaho Consolidated Metals Corp. optioned the Dean Mine and mill site and intended to establish sufficient high-grade reserves to justify the construction of a facility utilizing the Swisher-bromine hydrometallurgical process for refractory sulfide ores. In 2004, St. George held the reclamation permit for the Dean Mine.

Comment (Economic Factors): The Dean Mine property contains a possible to probable gold resource of 246,000 ounces of gold, with 11,000 ounces proven, part of which has already been mined.

Comment (Geology): Silver is subodinate to gold in the ore.

Comment (Identification): All material from earlier record M231413 for the historic Dean mine has been incorporated into the current record.

Comment (Location): The mine is located in Dean Canyon

Comment (Workings): The mine has been developed by numerous adits, shafts, and other workings since the 1890s.

References

Reference (Deposit): Stager, H.K., 1977, Geology and Mineral Deposits of Lander Co., Nev.; Nev. Bur. Mines & Geol. Bull. 88 Pt 2

Reference (Deposit): Vanderburg, W.O., 1939, Reconnaissance of Mining Districts in Lander Co., Nev.; USBM Info Circ. 7043

Reference (Deposit): Lemmons, W.H., A Reconnaissance of some Mining Camps in Elko, Lander, and Eureka Counties, Nevada 1910, USGS Bull 408.

Reference (Deposit): Gilluly, J., and Gates, O., 1965, Tectonic and Igneous Geology of the Northern Shoshone Range, Nevada: Section on Econ Geol by K.B. Ketner; USGS Prof Paper 465

Reference (Deposit): Long, K.R., DeYoung, J.H., Jr., and Ludington, S.D., 1998, Database of significant deposits of gold, silver, copper, lead, and zinc in the United States; Part A, Database description and analysis; part B, Digital database: U.S. Geological Survey Open-File Report 98-206, 33 p., one 3.5 inch diskette.

Reference (Deposit): Prihar, D.W., Peters, S.G., Bourns, F.T., McKee, E.H., 1996, Geology and Gold Potential of the Goat Ridge Window, Shoshone Range, Lander County, Nevada in Coyner, A.R. and Fahey, P.L., eds., Geology and Ore Deposits of the American Cordillera: Geological Society of Nevada Symposium Proceedings, Reno/Sparks, Nevada, April, 1995, p. 485-504.

Reference (Deposit): Denver Mining Record, 9/7/94; 9/13/95.

Nevada Gold

Nevada has a total of 368 distinct gold districts. Of the of those, just 36 are major producers with production and/or reserves of over 1,000,000 ounces, 49 have production and/or reserves of over 100,000 ounces, with the rest having less than 100,000 ounces. Read more: Gold Districts of Nevada.