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Dean Mine

Past Producer in Lander county in Nevada, United States with commodities Gold, Silver, Lead, Zinc, Iron, Copper
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Geologic information

Identification information

Deposit ID 10310310
MRDS ID M231413
Record type Site
Current site name Dean Mine
Alternate or previous names Cumberland Mine
Related records 10044087

Comments on the site identification

  • All material from earlier record M231413 for the historic Dean mine has been incorporated into the current record.

Geographic coordinates

Geographic coordinates: -116.84761, 40.42907 (WGS84)
Elevation 2500
Relative position The Dean Mine is located about 17miles south of the town of Battle Mountain.
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Geographic areas

Country State County
United States Nevada Lander

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 030N 045E 36 Nevada
Mount Diablo 030N 046E 31 Nevada

Comments on the location information

  • The mine is located in Dean Canyon

Commodities

Commodity Importance
Gold Primary
Silver Primary
Lead Tertiary
Zinc Tertiary
Iron Tertiary
Copper Tertiary

Comments on the commodity information

  • Ore Materials: free gold, galena, sphalerite, pyrite, arsenopyrite, chalcopyrite
  • Gangue Materials: quartz, calcite, barite

Materials information

Materials Type of material
Gold Ore
Galena Ore
Sphalerite Ore
Pyrite Ore
Arsenopyrite Ore
Chalcopyrite Ore
Quartz Gangue
Calcite Gangue
Barite Gangue

Alteration

  • (Local) sericitic, pyritic, propylitic

Mineral occurrence model information

Model code 75
USGS model code 19c
BC deposit profile E03
Deposit model name Distal disseminated Ag-Au
Mark3 model number 18

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Shale
    Stratigraphic age (youngest) Ordovician
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Quartzite
    Stratigraphic age (youngest) Ordovician
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granodiorite
    Stratigraphic age (youngest) Tertiary
  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granodiorite
    Stratigraphic age (youngest) Tertiary

Nearby scientific data

(1) -116.84761, 40.42907
ListMap

Geologic structures

Type Description Terms
Local Laramide faulting; Dean Mine fault
Regional Roberts Mountains Thrust at depth

Ore body information

  • General form tabular

Controls for ore emplacement

  • fractures, shears

Comments on the geologic information

  • Silver is subodinate to gold in the ore.

Economic information

Economic information about the deposit and operations

Operation type Surface-Underground
Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant Yes

Mining district

District name Lewis District

Land status

Ownership category Private
Ownership category BLM Administrative Area
Area name Battle Mountain BLM Administrative District

Ownership information

  • Type Owner-Operator
    Owner St. George Metals, Inc.
    Year 1997

Comments on the workings information

  • The mine has been developed by numerous adits, shafts, and other workings since the 1890s.

Comments on other 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.

Comments on 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.

Reference information

Bibliographic references

  • Deposit

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

  • Deposit

    Vanderburg, W.O., 1939, Reconnaissance of Mining Districts in Lander Co., Nev.; USBM Info Circ. 7043

  • Deposit

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

  • 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

  • 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.

  • 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.

  • Deposit

    Denver Mining Record, 9/7/94; 9/13/95.

General comments

Subject category Comment text
Deposit The mineralization occurs in three veins: the Cumberland, the Morning Star and the Pittsburg.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-SEP-2005 LaPointe, D.D.. Nevada Bureau of Mines and Geology
Editor 01-SEP-2007 Schruben, Paul G. U.S. Geological Survey Converted from S&A FileMaker format to Oracle. Edit checks on rocks, units, and ages with Geolex search, and other fields.