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Ramshorn Mine

Past Producer in Custer county in Idaho, United States with commodities Silver, Lead, Copper, Gold, Zinc
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Mineral rights holdings
  17. Land status
  18. Ownership information
  19. Production statistics
  20. Workings at the site
  21. Links to other databases
  22. Bibliographic references
  23. General comments
  24. Reporter information

Geologic information

Identification information

Deposit ID 10071079
MRDS ID W014288
MAS/MILS ID 160370279
Record type Site
Current site name Ramshorn Mine
Alternate or previous names Utah Boy, Post Boy, Aetna

Geographic coordinates

Geographic coordinates: -114.3614, 44.4103 (WGS84)
Elevation 2195
Relative position NINE MI SW CHALLIS

Site location context

Political divisions (FIPS codes)

Custer(county)

Idaho(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Bayhorse(quadrangle 1:24,000 scale)

White Cloud Peaks(quadrangle 1:100,000 scale)

Challis(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Salmon(hydrologic unit)

Salmon(hydrologic accounting unit)

Lower Snake(hydrologic subregion)

Pacific Northwest(hydrologic region)

Federal lands

Salmon-Challis National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Idaho Custer

Public Land Survey System information

Meridian Township Range Section Fraction State
Boise 013N 018E 32 SENWSE Idaho

Commodities

Commodity Importance
Silver Primary
Lead Primary
Copper Secondary
Gold Tertiary
Zinc Critical Tertiary

Comments on the commodity information

  • Fluorite Is Too Low Grade For Economical Production, Metals Are Mined Out Or Are Too Low Grade

Materials information

Materials Type of material
Argentite Ore
Chalcopyrite Ore
Galena Ore
Sphalerite Ore
Tetrahedrite Ore
Cerargyrite Ore
Fluorite Ore
Malachite Ore
Pyrite Gangue
Quartz Gangue
Siderite Gangue
Calcite Gangue

Alteration

  • (Local) Silicification
  • (Local) Recrystallization

Analytical data

Result ASSAYS UNOXIDIZED ORE AVG: \n100.1 OZ AG/TON, \n0.6% PB, \n2.2% CU
Result OXIDIZED ORE AVG: \n179.9 OZ AG/TON, \n6.7% PB, \n2.8% CU, \nTRACE AU.

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate
    Rock type qualifier Conglomerate Facies & Tan Argillaceous Slate
    Rock unit name Ramshorn Slate
  • Host or associated Host
    Rock type Metamorphic Rock > Phyllite
    Rock type qualifier Dark-Gray Sericite Phyllite
    Rock unit name Garden Creek Phyllite
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Dolomite
    Rock type qualifier Dolomite With Few Beds Of Slate
    Rock unit name Bayhorse Dolomite
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Quartzite
    Rock type qualifier Lavender Fine-Grained Quartzites
    Rock unit name Kinnikinic Quartzite
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Conglomerate
    Rock type qualifier Pebble Conglomerate
    Rock unit name Kinnikinic Quartzite
  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Quartz Monzonite
    Rock type qualifier Calcic Quartz Monzonite
    Rock unit name Idaho Batholith
    Stratigraphic age (youngest) Miocene
    Stratigraphic age (oldest) Oligocene
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Rock type qualifier Latite Andesites
    Rock unit name Challis Volcanics
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Pyroclastic Rock > Tuff
    Rock type qualifier Bedded Tuffs
    Rock unit name Challis Volcanics
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Jurassic

Economic information

Geologic structures

Type of structure Local
Structure name Faults
Structure description 2 Faults
Type of structure Regional
Structure name Bayhorse Anticline
Structure description Bayhorse Anticline

Ore body information

  • General form TABULAR
    Strike N 15 DEG W
    Dip 80 DEG SW
    Length 121.92M
    Width 1.83M
    Depth to bottom 518.16M

Controls for ore emplacement

  • Fissures
  • Faults
  • Shear Zone
  • Anticlinal Crests

Comments on the geologic information

  • Ross Believed Mineralization To Be Late Mesozoic, Chambers and Others Felt Mineralization Was Early Tertiary

Economic information about the deposit and operations

Operation type Underground
Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1877
Year of first production 1877

Mining district

District name Bayhorse District

Mineral rights holdings

Type of mineral rights Patented

Land status

Ownership category National Forest
Area name Challis National Forest

Ownership information

  • Type Operator
    Owner Ramshorn Mines Co.
  • Type Owner
    Owner Chambers, Arthur Edwin

Production statistics

  • Year 1926
    Period 1902-1926
    Material Shipping Ore
    Accuracy Accurate
    Description Cp_Grade: ^1926 Shipping Ore: 700 - 3000 Oz Ag/T, 4.8 - 49.7 % Pb, 4.35 - 8.3 % Cu
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Lead Lead 27wt-pct
    Major Ore Copper Copper 6wt-pct
    Major Ore Silver Silver 52230g/mt
  • Year 1926
    Period 1902-1926
    Material Milling Ore
    Accuracy Accurate
    Description Cp_Grade: ^ 1926 Milling Ore: 37.4 - 56.8 Oz Ag/T, 1 - 9.8 % Pb, 0.97 - 1.6 % Cu
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Lead Lead 5wt-pct
    Major Copper Copper 1wt-pct
    Major Silver Silver 1330g/mt
  • Year 1943
    Material ORE
    Accuracy Accurate
    Description Ap_Grade: ^6. % Cu, 9. % Pb, 166 Oz/Ton Ag
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Lead Lead 9wt-pct
    Major Ore Copper Copper 6wt-pct
    Major Ore Silver Silver 4687g/mt

Comments on the production information

  • Production Figures Are For Years 1902-1926. Production In 1877-1897 Was Near $3,000,000. Early Grade Was Reported To Be 8% Pb and 120 Oz/Ton Ag. Minor Production 1927-1964

Workings at the site

  • Type of workings Underground
    Length 10972.8M
    Overall depth 518.16M

Comments on the workings information

  • 17 Tunnels, 10 Levels. Vertical Distance From Top Level To Bottom Level Is 1700 Ft. Individual Veins Rarely Exceeds 400 Ft In Length, But the Composite Length of the Several Veins Was 3500 Ft.

Comments on development

  • Long Distance To Smelters and Small Size of Lodes Discourage Further Exploration and Development

Reference information

Bibliographic references

  • Deposit

    Umpleby, J. B., 1913, Some Ore Deposits In Northwestern Custer County, Idaho: USGS Bulletin 539, 104 P.

  • Production

    Ross, C.P., 1937 , USGS Bulletin 877 Campbell, A., 1947 , 48th Annual Report, P. 240 Campbell, A., 1945 , 46th Annual Report, P. 202 McDowell, G.A., 1948 , 49th Annual Report, P. 234 Campbell, A., 1946 , 47th Annual Report, P. 245.

  • Deposit

    Ross, C. P., 1937, Geology And Ore Deposits Of The Bayhorse Region, Custer County, Idaho: USGS Bulletin 877, 161 P.

  • Deposit

    Lokken, J. C., 1925, A Metallurgical Investigation Of Ore Of The Ramshorn Mine, Custer County, Idaho: Moscow, Idaho, Univ. Of Idaho Ms Thesis, 46 P.

  • Deposit

    Campbell, A., 1947, Forty-Eighth Annual Report Of The Mining Industry Of Idaho For The Year 1946.

  • Deposit

    Campbell, A., 1945, Forty-Sixth Annual Report Of The Mining Industry Of Idaho For The Year 1944.

  • Deposit

    McDowell, G. A., 1948, Forty-Ninth Annual Report Of The Mining Industry Of Idaho For The Year 1947.

  • Deposit

    Campbell, A., 1946, Forty-Seventh Annual Report Of The Mining Industry Of Idaho For The Year 1945.

  • Deposit

    1913 Geolmap Umpleby, J. B., Bulletin 539

  • Deposit

    1937 Geolmap Ross, C. P., Bulletin 877

  • Deposit

    Bell, R.N. Fourteenth Annual Report Of The Mining Industry Of Idaho For The Year 1912, P. 94

  • Deposit

    Bell, R.N. 1904 Report Of The Mining Districts Of Idaho For The Year 1903, P. 50-51

  • Deposit

    U.S. Bureau Of Mines Open-File Report MLA 6-91, 1991, Table A-3, No. 516, P. 226.

  • Deposit

    Chambers, A. E., 1966, Geology And Mineral Deposits Of Part Of The Bayhorse Mining District: Unpublished Ph.D Dissertation, Univ. Of Arizona

  • Deposit

    Bayshore Smelter, 1902, Ramshorn Mines Company Production For 1902-1906: Bayhorse Smelter Records.

General comments

Subject category Comment text
Deposit 3 Veins Named. East Utah Boy, West Utah Boy, Post Boy.

Reporter information

Type Date Name Affiliation Comment
Reporter 1974-04-01 Petersen, David W. U.S. Geological Survey
Reporter 1976-07-01 Siefken, Robert R. (Miller, Pat) U.S. Geological Survey
Reporter 1992-11-06 Western Field Operations Center (WFOC) U.S. Bureau of Mines

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

External references

Maps centered on this site