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Eldorado Claim

Occurrence in San Juan county in Colorado, United States with commodities Copper, Lead, 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. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10014091
MRDS ID D010717
Record type Site
Current site name Eldorado Claim
Alternate or previous names Patented Claim: El Dorado, Ms 16686

Geographic coordinates

Geographic coordinates: -107.56813, 37.7389 (WGS84)
Elevation 3755
Relative position 7 MILES S 48 E FROM SILVERTON

Site location context

Political divisions (FIPS codes)

San Juan(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Storm King Peak(quadrangle 1:24,000 scale)

Silverton(quadrangle 1:100,000 scale)

Durango(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Animas(hydrologic unit)

Upper San Juan(hydrologic accounting unit)

San Juan(hydrologic subregion)

Upper Colorado(hydrologic region)

Federal lands

San Juan National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Weminuche Wilderness(Wilderness)

Wilderness FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Colorado San Juan

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 040N 006W 18 NW Colorado

Comments on the location information

  • (LAND STATUS AND ADMINISTRATIVE AREA LOCATIONS CALCULATED USING GIS OVERLAY ANALYSIS FOR SAN JUAN N. F.). ON RIDGE WEST OF CONTINENTAL DIVIDE ABOVE UNNAMED TRIBUTARIES OF ELK CREEK 3.45 MILES WNW OF BEARTOWN SITE (UNSURVEYED SECTION). ; INFO FROM LAND.ST :1977

Commodities

Commodity Importance
Copper Primary
Lead Primary
Zinc Critical Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Pyrite Ore
Sphalerite Ore
Barite Gangue
Calcite Gangue
Chlorite Gangue
Limonite Gangue
Magnetite Gangue
Quartz Gangue

Analytical data

Result STEVEN AND OTHERS' (1969) CHEMICAL ANALYSES OF THREE SAMPLES FROM SIMILAR PYRITE-BEARING CHLORITIC SHEARED ZONES SHOWED 0.02 PPM AU, 610 TO 960 PPM CU, 25 TO 36 PPM PB, 40 TO 70 PPM ZN, LT 2 TO 16 PPM MO, 10 PPM AS, 1 PPM SB, 0.15 PPM HG, 5.6 PPM TE, 1.2 PPM AG.

Mineral occurrence model information

Model code 84
USGS model code 22b
Deposit model name Alkaline Au-Te (Au-Ag-Te veins)
Mark3 model number 80

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyodacite
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Oligocene
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Quartz Latite
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Rock unit name San Juan Formation;Early Intermediate Lavas And Breccias--Near-Source Facies
    Rock description San Juan Formation;Early Intermediate Lavas And Breccias--Near-Source Facies
  • Host or associated Host
    Rock type Metamorphic Rock > Schist
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss
    Rock unit name Irving Formation
    Rock description Irving Formation

Nearby scientific data

(1) -107.56813, 37.7389
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description San Juan Uplift, San Juan Volcanic Field
Type of structure Local
Structure description San Juan Uplift, San Juan Caldera, Unnamed Faults

Controls for ore emplacement

  • Se-Trending Fissure In Precambrian Schist

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Beartown (Bear Creek) District

Land status

Ownership category National Forest
Area name San Juan N. F.

Comments on the workings information

  • ONE TUNNEL OF UNKNOWN EXTENT DRIVEN GENERALLY SE

Reference information

Bibliographic references

  • Deposit

    STEVEN, T.A., AND OTHERS, 1969, MINERAL RESOURCES OF THE SAN JUAN PRIMITIVE AREA, COLORADO: USGS BULL. 1261-F, P. 67-71, 89-90, 168-171.

  • Deposit

    PROSSER, W.C., 1911, THE BEAR CREEK SYLVANITE CAMP, COLORADO: ENG. MINING JOUR., V. 91, P. 712.

  • Deposit

    CROSS, WHITMAN, AND OTHERS, 1905, DESCRIPTION OF THE NEEDLE MOUNTAINS QUADRANGLE, COLORADO: USGS FOLIO 131.

  • Deposit

    STEVEN, T.A., AND OTHERS, 1974, GEOLOGIC MAP OF THE DURANGO QUADRANGLE, SOUTHWESTERN COLORADO: USGS MAP I-764.

  • Deposit

    BLM MINERAL SURVEY MS 16686

General comments

Subject category Comment text
Deposit SITE LIES NE OF CONTACT BETWEEN OLDER METAMORPHICS OF IRVING FM AND YOUNGER QUARTZITES AND SLATES OF UNCOMPAHGRE FM. TUNNEL WAS DRIVEN TOINTERSECT FISSURE TRENDING S 46 E AND COMPOSED OF MICACEOUS CHLORITIC SCHIST. CROSS AND OTHERS (1905) NOTE THAT, IN CONTRAST TO OTHER MINES IN DISTRICT, ELDORADO SHOWED NO TETRAHEDRITE OR TELLURIDES. AU AND AG MAY BE CONTAINED IN SMALL AMOUNTS IN PYRITE AND/OR CHALCOPYRITE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1983 Schwochow, Stephen D. Colorado Geological Survey

Beyond USGS

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

Maps centered on this site

Authoritative Colorado resources

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