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Muldoon Mine

Past Producer in La Plata county in Colorado, United States with commodities Silver, Gold, Antimony, Arsenic
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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. Ore body information
  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 10087918
MRDS ID D010844
Record type Site
Current site name Muldoon Mine
Alternate or previous names Patented Claim: Muldoon, MS 2356, Unpatented Claims: Independence, Cumberland
Related records 10118532

Geographic coordinates

Geographic coordinates: -108.00008, 37.44501 (WGS84)
Elevation 3606
Relative position 13.1 MILES N 31 W FROM DURANGO

Site location context

Political divisions (FIPS codes)

La Plata(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

La Plata(quadrangle 1:24,000 scale)

Cortez(quadrangle 1:100,000 scale)

Cortez(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)

Geographic areas

Country State County
United States Colorado La Plata

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 037N 010W 19,20 E2 OF SE (19); NW OF SW (20) Colorado

Comments on the location information

  • (LAND STATUS AND ADMINISTRATIVE AREA LOCATIONS CALCULATED USING GIS OVERLAY ANALYSIS FOR SAN JUAN N. F.). ON EAST RIDGE OF CUMBERLAND MTN IN HEADWATERS OF JUNCTION CREEK, 4.65 MILES NE OF LA PLATA TOWNSITE (UNSURVEYED SECTION). ; INFO FROM LAND.ST :1974

Commodities

Commodity Importance
Silver Primary
Gold Secondary
Antimony Critical Tertiary
Arsenic Critical Tertiary

Materials information

Materials Type of material
Gold Ore
Proustite Ore
Pyrargyrite Ore
Barite Gangue
Quartz Gangue

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Porphyritic Rocks--Diorite-Monzonite Porphyry
    Rock description Porphyritic Rocks--Diorite-Monzonite Porphyry
    Stratigraphic age (youngest) Paleocene
    Stratigraphic age (youngest) Late Permian
    Stratigraphic age (youngest) Late Permian
    Stratigraphic age (youngest) Paleocene
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Mudstone
    Rock unit name Cutler Formation
    Rock description Cutler Formation

Nearby scientific data

(1) -108.00008, 37.44501
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description San Juan Uplift, Four Corners Platform
Type of structure Local
Structure description La Plata Dome

Ore body information

  • Thickness 0.74M

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of last production 1949

Mining district

District name California (La Plata) District

Land status

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

Ownership information

  • Type Operator
    Owner Todeski, Herman
    Home office Durango, Co.
    First year 1960
  • Type Owner
    Owner Mrs. Herman Dalla
    Home office Durango, Co.
    First year 1960

Production statistics

  • Year 1918
    Material AG ACC
    Description Ap_Grade: ^158.5 Oz/Ton Ag, 0.06 Oz/Ton Au
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Minor Gold Gold 2g/mt
    Major Silver Silver 4475g/mt
  • Year 1919
    Material AG ACC
    Description Ap_Grade: ^514.33 Oz/Ton Ag, 0.253 Oz/Ton Au
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Minor Gold Gold 7g/mt
    Major Silver Silver 14520g/mt

Comments on the production information

  • PARTIAL PRODUCTION RECORD. FIGURES UNAVAILABLE PRIOR TO 1917; NO PRODUCTION FROM 1920-1935, FROM 1936-1948, AND AFTER 1949, ORE TONNAGES AND GRADES FOR 1935 AND 1949 FROM COLO. DIV. MINES ANN. OPERATOR REPTS.

Comments on the workings information

  • OLDER WORKINGS CONSIST OF LOWER TUNNEL DRIVEN S 8 W FOR 80 FT TO VEIN WITH 40 FT OF DRIFT, UPPER TUNNEL DRIVEN DUE SOUTH FOR 40 FT TO VEIN WITH 40-FT SW DRIFT AND 65-FT NE DRIFT. LATER DEVELOPMENTS INCLUDE AT LEAST SEVERAL HUNDRED FEET OF CROSSCUT TUNNEL AND DRIFTS.

Comments on development

  • EARLY HISTORY UNCERTAIN, WORKED BY P.W. PITTMAN FROM 1917 TO 1919, THEN LEASED TO HERMAN DALLA AND DAVID BIANCHI. ALTHOUGH LAST PRODUCTION WAS 1949, DEVELOPMENT WORK (NEW TUNNELS AND DRIFTS) CONTINUED FROM 1956-1959.

Reference information

Bibliographic references

  • Deposit

    ECKEL, E.B., AND OTHERS, 1949, GEOLOGY AND ORE DEPOSITS OF THE LA PLATA DISTRICT, COLORADO: USGS PROF. PAPER 219, P. 73-74, 155-156.

  • Deposit

    BLM MINERAL SURVEY MS 2356

  • Deposit

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

  • Production

    ECKEL AND OTHERS, 1949, P. 156 (AS COMPILED FROM USGS AND USBM RECORDS); COLORADO DIV. MINES ANN. OPERATOR REPTS.

General comments

Subject category Comment text
Deposit COUNTRY ROCK CONSISTS OF UPPER CUTLER FM RED BEDS INTRUDED BY DIORITE-MONZONITE PORPHYRY SILLS AND DIKES AND IS TRAVERSED BY QUARTZ-BARITE VEIN TRENDING N 71 E. IN UPPER LEVEL OF MINE, VEIN IS VERTICAL, BUT DIPS NORTHERLY IN LOWER LEVEL.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1983 Schwochow, Stephen D. Colorado 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 Colorado resources

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