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Old Democrat Mine

Past Producer in Lincoln county in Nevada, United States with commodities Zinc, Lead, Silver, Copper, Manganese, Iron, Cadmium, Arsenic, Antimony, Zirconium, Tin
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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. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Ore body information
  14. Controls for ore emplacement
  15. Economic information about the deposit and operations
  16. Mining district
  17. Ownership information
  18. Production statistics
  19. Links to other databases
  20. Bibliographic references
  21. General comments
  22. Reporter information

Geologic information

Identification information

Deposit ID 10037356
MRDS ID M032039
Record type Site
Current site name Old Democrat Mine
Alternate or previous names NBMG Sample Site 1443, Part of Comet Coalition Mines, Co, In 1949.

Geographic coordinates

Geographic coordinates: -114.5239, 37.69386 (WGS84)
Elevation 1768
Relative position ABOUT 0.8 AIRMILE N10E FROM COMET MINE

Site location context

Political divisions (FIPS codes)

Lincoln(county)

Nevada(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Chief Mountain(quadrangle 1:24,000 scale)

Caliente(quadrangle 1:100,000 scale)

Caliente(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Meadow Valley Wash(hydrologic unit)

Lower Colorado-Lake Mead(hydrologic accounting unit)

Lower Colorado-Lake Mead(hydrologic subregion)

Lower Colorado(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management NV)

Bureau of Land Management NV BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States Nevada Lincoln

Public Land Survey System information

Meridian Township Range Section Fraction State
03S 67E 18 NW OF NW OF SW Nevada

Comments on the location information

  • AT MOUTH OF PEASLEE CANYON

Commodities

Commodity Importance
Zinc Critical Primary
Lead Primary
Silver Primary
Copper Secondary
Manganese Critical Tertiary
Iron Tertiary
Cadmium Tertiary
Arsenic Critical Tertiary
Antimony Critical Tertiary
Zirconium Critical Tertiary
Tin Critical Tertiary

Comments on the commodity information

  • BACKGROUND RADIOACTIVITY= 0.01 MR/HR; HIGH= 0.03 MR/HR.

Materials information

Materials Type of material
Galena Ore
Manganite Ore
Psilomelane Ore
Pyrolusite Ore
Sphalerite Ore
Clay Gangue
Goethite Gangue
Lepidocrocite Gangue
Pyrite Gangue

Alteration

  • (Local) Intense Silicification

Analytical data

Result ASSAY AT PORTAL: 1.5 OZ/T AG, 0.5% PB, 1.5% ZN, 13-18% MN. SAMPLE 1443 CONTAINS 20% FE, GREATER THAN 5000 PPM MN, 100 PPM AG, 500 PPM AS, 1000 PPM BA, 500 PPM CD, 200 PPM CU, 10000 PPM PB, 100 PPM SN, 300 PPM SR, 10000 PPM ZN, 100 PPM ZR.

Mineral occurrence model information

Model code 72
USGS model code 19a
Deposit model name Polymetallic replacement
Mark3 model number 47

Host and associated rocks

  • Host or associated Associated
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Shale
    Stratigraphic age (youngest) Late Cambrian
    Stratigraphic age (youngest) Late Cambrian
  • Host or associated Associated
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Siltstone
  • Host or associated Associated
    Rock type Plutonic Rock > Porphyry > Lamprophyre
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Combined Metals Member Of Pioche Shale
    Rock description Combined Metals Member Of Pioche Shale

Nearby scientific data

(1) -114.5239, 37.69386
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description N18w Fault Zone At 400 Ft From Portal.

Ore body information

  • General form TABULAR TO IRREGULAR
    Strike (1) SLOW (2)S25E
    Dip (1) 72W (2) 90
    Depth to top 0M

Controls for ore emplacement

  • Fractures; Gouge Zones

Comments on the geologic information

  • MUDDY BROWN MICACEOUS SILTSTONES AND SHALES OVERLIE THE LIMESTONE LOCALLY. THESE ROCKS SHOW SOME FE-MN VEINING AND BLEACHING EFFECTS. LIMESTONE STRIKING N-S, DIP 8-15E.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1892

Mining district

District name Chief Districtdistrict

Ownership information

  • Type Operator
    Owner Nerco
    First year 1983

Production statistics

  • Year 1932
    Material ORE
    Accuracy Accurate
    Description Ap_Grade: ^.89 Oz Au, 8 Oz Ag Per Ton, 1% Pb
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Ore Lead Lead 1wt-pct
    Major Ore Silver Silver 226g/mt
    Major Ore Gold Gold 25g/mt

Comments on the workings information

  • INCLINED SHAFT TRENDING N75W-N82E, CAVED IN 1983. SEVERAL OLD STRUCTURES ON PROPERTY; MODERATE DUMP, BUT NOT AS LARGE AS THOSE OF THE COMET AND PANAMERICAN MINES.

Comments on development

  • INCLINE WAS DRIVEN AS AN EXPLORATION PROSPECT BY INTERNATIONAL SMELTING AND REFINING CO. NERCO WAS DOING ASSESSMENT WORK IN THE AREA IN 1983.

Reference information

Bibliographic references

  • Deposit

    TSCHANTZ CM & PAMPEYAN EH, 1970, GEOLOGY & MINERAL DEPOSITS OF LINCOLN CO., NEV BUR MINES BULL 73

  • Deposit

    BENTZ, J. AND SMITH, P., 1983, FIELD EXAMINATION REPORT, AUG 27, 1983.

  • Deposit

    FITCH, D. C., 1964, GEOLOGY AND ORE DEPOSITS OF THE COMET DISTRICT, LINCOLN CO., NEVADA; UNIV OF NEW MEXICO MS THESIS, P. 77-78, FIG. 21.

  • Deposit

    USAEC PRELIM RECONN REPT 3653.

General comments

Subject category Comment text
Deposit AT PORTAL, LIMESTONE IS ALTERED TO (OR REPLACED BY) GOSSANY FE AND MN OXIDES AND SILICA. 2 OR 3 GOSSANY BEDS AVERAGING 2-4 FT THICK ARE EXPOSED AT PORTAL. REPLACED BEDS ARE DARK GREY TO BLACK AND CHARACTERIZED BY SILICIC FE-MN BOXWORKS, POCKETS OF FE-MN OXIDES AND VUGS OF CLEAR VITREOUS QUARTZ. PORTIONS OF THE ALTERED ROCK ARE VERY STRONGLY SILICIFIED. REPLACED BEDS ARE DARKER IN COLOR THAN THE ORIGINAL HOST WHICH IS A DARK GREY FINELY CRYSTALLINE LIMESTONE DISPLAYING GIRVANELLA ALGAL FOSSIL CASTS. SAMPLE 1443 FROM THE DUMP CONSISTS OF BLACK SILICEOUS FE-MN RICH REPLACEMENT ORE (GOSSAN) WHICH IS QUITE HEAVY. THE ORE SHOWS PSILOMELANE ON SURFACES AND CONTAINS FINELY CRYSTALLINE GALENA, SPHALERITE AND MINOR PYRITE. BRIGHT YELLOW OXIDES ARE PRESENT ON SOME SURFACES OF SAMPLES. THE GOSSAN CONTAINS VUGS FILLED WITH LATE CALCITE AND QUARTZ AND SHOWS SOME BOXWORK STRUCTURES.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1980 Harner, Joy L. (Roberts, Ralph J.) U.S. Geological Survey
Updater 01-AUG-1984 La Pointe, D.D. (Tingley, J.V.) U.S. Geological Survey

Beyond USGS

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

External references

Maps centered on this site

Authoritative Nevada resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.