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Shamrock Mine

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

Geologic information

Identification information

Deposit ID 10014141
MRDS ID D010788
Record type Site
Current site name Shamrock Mine
Alternate or previous names Patented Claim: Shamrock, Ms 5832
Related records 10214725

Geographic coordinates

Geographic coordinates: -108.03426, 37.69307 (WGS84)
Elevation 2667
Relative position 0.25 MILES N 76 W 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 040N 011W 35 N2 OF NE Colorado

Comments on the location information

  • (LAND STATUS AND ADMINISTRATIVE AREA LOCATIONS CALCULATED USING GIS OVERLAY ANALYSIS FOR SAN JUAN N. F.). AT BASE OF HILL ON WEST SIDE OF DOLORES RIVER (UNSURVEYED SECTION). ELEV AND LAT-LONG GIVEN ARE FROM MCKNIGHT, 1974, PL. 1 (1930 BASE). ; INFO FROM LAND.ST :1975

Commodities

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

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Sphalerite Ore
Andalusite Gangue
Chlorite Gangue
Cordierite Gangue
Magnetite Gangue

Alteration

  • (Local) Marbleization Of Limestone

Analytical data

Result 1925 ORE RESERVE ESTIMATED CITED 5.72 OZ/TON AG, 6% PB, 10.23% ZN. ORE PRODUCED IN 1926-1927 CONTAINED 2.743 TO 5.75 OZ/TON AG, 8.042 TO 9.9% PB, 12.39 TO 15.85% ZN, 0.359 TO 0.57% CU, 0.005 TO 0.009 OZ/TON AU

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Monzonite
    Stratigraphic age (youngest) Paleocene
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Latite
    Rock unit name Hornblende Latite Porphyry;Augite Monzonite
    Rock description Hornblende Latite Porphyry;Augite Monzonite
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Leadville Limestone;Ouray Limestone
    Rock description Leadville Limestone;Ouray Limestone

Nearby scientific data

(1) Rico and Hermosa Fms
ListMap

Economic information

Geologic structures

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

Ore body information

  • General form IRREGULAR

Controls for ore emplacement

  • Chemically Favorable Limestone Near Intrusive Source

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1878
Year of last production 1927

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 Rico-Argentine Mining Co.
    Home office Salt Lake City, Ut.
    First year 1948

Comments on the production information

  • COMPLETE PRODUCTION RECORD UNKNOWN. PRODUCTION REPORTED FROM SHAMROCK IN 1925 COMBINED WITH ATLANTIC CABLE. OTHER PRODUCTION REPORTED FROM SHAMROCK IN 1926 AND 1927. SEE ATLANTIC CABLE MINE RECORD FOR REPORTED PRODUCTION.

Comments on the workings information

  • TUNNEL DRIVEN GENERALLY WEST FOR 600 FT, INTERSECTING 70-FT LEVEL OFF 170-FT SHAFT. SECOND LEVEL AT 170 FT IN SHAFT.

Reference information

Bibliographic references

  • Deposit

    MCKNIGHT, E.T., 1974 GEOLOGY AND ORE DEPOSITS OF THE RICO DISTRICT, COLORADO: USGS PROF. PAPER 723, P.75-76,95.

  • Deposit

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

  • Deposit

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

  • Deposit

    BLM MINERAL SURVEY MS 5832

General comments

Subject category Comment text
Deposit MCKNIGHT (1974) DESCRIBES GENERAL CONTACT-METAMORPHIC DEPOSIT AS BASE-METAL SULFIDES IN IRREGULAR PODS SCATTERED THROUGH MASS OF SPECULARITE, MAGNETITE, AND CHLORITE REPLACING LEADVILLE AND OURAY MARBLEIZED LIMESTONES, WITH ABUNDANT PYRITE AND QUARTZ SILICIFICATTION. SHAMROCK ORE IS LOCALIZED ON EAST-WEST-TRENDING FRACTURES AND CONTAINS MANGANIFEROUS SIDERITE AND MANGANIFEROUS CALCITE GANGUE.

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.