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Lexington Tunnel

Past Producer in Dolores county in Colorado, United States with commodities Silver, Lead, Zinc, Copper, Gold, Manganese
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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. Ownership information
  17. Production statistics
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10014130
MRDS ID D010774
Record type Site
Current site name Lexington Tunnel
Related records 10166579

Geographic coordinates

Geographic coordinates: -108.03037, 37.68307 (WGS84)
Elevation 2716
Relative position 0.65 MILES S 1 E FROM RICO

Site location context

Political divisions (FIPS codes)

Dolores(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Rico(quadrangle 1:24,000 scale)

Dove Creek(quadrangle 1:100,000 scale)

Cortez(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Dolores(hydrologic unit)

Upper Colorado-Dolores(hydrologic accounting unit)

Upper Colorado-Dolores(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)

Geographic areas

Country State County
United States Colorado Dolores

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 039N;040N 011W;011W 01;36 Colorado

Comments on the location information

  • (LAND STATUS AND ADMINISTRATIVE AREA LOCATIONS CALCULATED USING GIS OVERLAY ANALYSIS FOR SAN JUAN N. F.). ON WEST SLOPE OF NEWMAN HILL BENEATH NEWMAN AND ENTERPRISE MINES WORKINGS (UNSURVEYED SECTIONS). ELEV AND LAT-LONG GIVEN ARE FROM MCKNITHT, 1974, PL. 1 (1930 BASE). ; INFO FROM LAND.ST :1975

Commodities

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

Comments on the commodity information

  • MINERALOGIES BASED ON DESCRIPTION OF EUREKA VEIN IN ENTERPRISE MINE

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Sphalerite Ore
Quartz Gangue
Rhodochrosite Gangue

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 Plutonic Rock > Mafic Intrusive Rock > Diorite > Diabase
    Stratigraphic age (youngest) Pennsylvanian
    Stratigraphic age (youngest) Paleocene
    Stratigraphic age (youngest) Pennsylvanian
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Latite
    Rock unit name Hornblende Latite Porphyry;Diabase (Basalt)
    Rock description Hornblende Latite Porphyry;Diabase (Basalt)
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Shale
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone
    Rock unit name Hermosa Formation
    Rock description Hermosa Formation

Nearby scientific data

(1) -108.03037, 37.68307
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description San Juan Uplift, Paradox Basin
Type of structure Local
Structure description Rico Dome

Controls for ore emplacement

  • Nw-Trending Near-Vertical Fissure

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of last production 1940

Mining district

District name Pioneer (Rico) District

Land status

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

Ownership information

  • Type Owner-Operator
    Owner Pelleyre Mining And Milling Co.
    Home office Salt Lake City, Ut.
    First year 1940

Production statistics

  • Year 1939
    Description Ap_Grade: ^26.0480 Oz/Ton Ag, 10.776% Pb, 27.525% Zn, 10.95 Cu, 0.4411 Oz/Ton Au
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Zinc Zinc 28g/mt
    Major Ore Lead Lead 11wt-pct
    Major Ore Silver Silver 736g/mt
    Minor Gold Gold 12wt-pct
    Minor Copper Copper 11wt-pct
  • Year 1940
    Description Ap_Grade: ^7.061 Oz/Ton Ag, 8.652% Pb, 44.708% Zn, 1.575% Cu, 0.5909 Oz/Ton Au
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Minor Gold Gold 17g/mt
    Minor Copper Copper 2wt-pct
    Major Zinc Zinc 45wt-pct
    Major Ore Lead Lead 9wt-pct
    Major Ore Silver Silver 199g/mt

Comments on the production information

  • PARTIAL PRODUCTION RECORD. FIGURES UNAVAILABLE FOR ALL PREVIOUS YEARS. ORE PRODUCED FROM DRIFT ON EUREKA VEIN.

Comments on the workings information

  • LEXINGTON TUNNEL DRIVEN S 75 E FOR 3000 FT; AT APPROX 1900 FT FROM PORTAL, DRIFT DRIVEN GENERALLY N 65 E FOR APPROX 800 FT ALONG EUREKA VEIN.

Reference information

Bibliographic references

  • Deposit

    MCKNIGHT, E.T., 1974, GEOLOGY AND ORE DEPOSITS OF THE RICO DISTRICT, COLORADO: USGS PROF. PAPER 723, P. 73-75.

  • Deposit

    PRATT, W.P., AND OTHERS, 1969, GEOLOGIC MAP OF THE RICO QUADRANGLE, DOLORES AND MONTEZUMA COUNTIES, COLORADO: USGS MAP GQ-797.

  • Deposit

    RANSOME, F.L., 1901, THE ORE DEPOSITS OF THE RICO MOUNTAINS, COLORADO: USGS 22D ANN. REPT., PT. 2, P. 339-340.

  • Deposit

    CROSS, WHITMAN, AND RANSOME, F.L., 1905, DESCRIPTION OF THE RICO QUADRANGLE: USGS FOLIO 130.

  • Deposit

    COLORADO DIV. MINES INF. REPT. AND ANNUAL OPERATOR REPTS.

  • Production

    COLORADO DIV. MINES ANNUAL OPERATOR REPTS.

General comments

Subject category Comment text
Deposit LOWER HERMOSA SANDSTONE AND SHALE DIP GENERALLY SW AND ARE CUT BY SEVERAL NE- AND NW-TRENDING VEINS BUT AT THAT DEPTH RANSOME (1901) NOTED THEM TO BE SMALL AND RELATIVELY BARREN. DRIFT ON EUREKA VEIN PROBABLY DEVELOPS DEEPER EUREKA FISSURE VEIN.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-SEP-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.