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May Rose Mine

Past Producer in La Plata county in Colorado, United States with commodities Gold, Silver, Tellurium, 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. Alteration
  9. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  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 10014178
MRDS ID D010839
Record type Site
Current site name May Rose Mine
Alternate or previous names Uncle Sam Mine, Saxon Mine, Unpatented Claims: Acropolis, Acropolis Extension, Big Bertha, Cresson, Ideal, Protection, Mayflower, Mayflower No. 1, May Rose, Mammoth, Model, Silver King, Tennie, Uncle Sam, Uncle Sam No. 1, Yuletide
Related records 10288538

Geographic coordinates

Geographic coordinates: -108.05871, 37.3814 (WGS84)
Elevation 3231
Location accuracy 250(meters)
Relative position 12.1 MILES N 56 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)

Middle San Juan(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 036N 011W 09,10,11,15 Colorado

Comments on the location information

  • (LAND STATUS AND ADMINISTRATIVE AREA LOCATIONS CALCULATED USING GIS OVERLAY ANALYSIS FOR SAN JUAN N. F.). CLAIMS LIE ALONG NEPTUNE CREEK FROM LA PLATA RIVER CONFLUENCE SE ONTO BRAGDON RIDGE AND INTO BURNT CREEK DRAINAGE, 0.5 TO 1.7 MILES SOUTH OF LA PLATA TOWNSITE (UNSURVEYED SECTION). ; INFO FROM LAND.ST :1974

Commodities

Commodity Importance
Gold Primary
Silver Primary
Tellurium Critical Tertiary
Copper Tertiary
Lead Tertiary
Zinc Critical Tertiary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Sphalerite Ore
Quartz Gangue

Alteration

  • (Local) Oxidation Of Pyrite To Limonite

Analytical data

Result CARAMOUZIS TABULATED ASSAYS FROM VARIOUS PROPERTIES. MAY ROSE VEIN ALONG TUNNEL AND RAISE CONTAINED 0.3 TO 1.2 OZ/TON AU WITH HIGHS OF 6.24 TO 6.80 OZ/TON AU, AND 0.2 TO 0.4 OZ/TON AG WITH HIGH OF 2.2 OZ/TON AG
Result WINZE CONTAINED 0.28 TO 4.8 OZ/TON AU WITH HIGHS OF 18.00, 61.72, AND 106.78 OZ/TON AU, AND 1.0 TO 7.0 OZ/TON AG WITH HIGHS OF 95.24 AND 312.3 OZ/TON AG
Result OTHER MAY ROSE ASSAYS RANGED FROM 0.04 TO 0.76 OZ/TON AU WITH HIGHS OF 3.7 AND 681 OZ/TON AU, AND TRACE TO 7 OZ/TON AG WITH HIGHS OF 69 AND 88.8 OZ/TON AG, 1.5% CU, AND SOME PB
Result MAY ROSE DUMP SAMPLES CONTAINED 2.04 TO 2.08 OZ/TON AU. UNCLE SAM VEIN ASSAYED 0.4 TO 5.75 OZ/TON AU AND 0.02 TO 1.9 OZ/TON AG. SILVER KING VEIN ASSAYED 0.16 TO 1.0 OZ/TON AU AND TRACE TO 0.12 OZ/TON AG. ACROPOLIS VEIN ASSAYED 0.66 TO 4.92 OZ/TON AU, 0.09 TO 15.3 OZ/TON AG, 2.6 TO 2.8% CU, 8.5% PB. SMELTER RETURNS FROM ACROPOLIS ORE GAVE 0.44 TO 0.56 OZ/TON AU, 5.8 TO 6.2 OZ/TON AG, 0.07 TO 1.2% CU, 0.06 TO 0.08% PB, 2.4 TO 3.2% ZN.

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 > Granitoid > Syenite
    Stratigraphic age (youngest) Late Permian
    Stratigraphic age (youngest) Late Permian
    Stratigraphic age (youngest) Eocene
  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Porphyritic Rocks--Diorite-Monzonite Porphyry;Nonporphyritic Rocks--Syenite
    Rock description Porphyritic Rocks--Diorite-Monzonite Porphyry;Nonporphyritic Rocks--Syenite
  • 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 Cutler Formation
    Rock description Cutler Formation

Nearby scientific data

(1) -108.05871, 37.3814
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

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1885
Year of first production 1887
Year of last production 1921

Mining district

District name California (La Plata) District

Land status

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

Ownership information

  • Type Owner-Operator
    Owner Amparo Mining Co.
    Home office Philadelphia, Pa.
    First year 1937

Production statistics

  • Year 1911
    Description Ap_Grade: ^3.10 Oz/Ton Au, 1.5 Oz/Ton Ag
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Silver Silver 42g/mt
    Major Ore Gold Gold 88g/mt
  • Year 1917
    Description Ap_Grade: ^12.1 Oz/Ton Au, 14.4 Oz/Ton Ag
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Silver Silver 407g/mt
    Major Ore Gold Gold 342g/mt
  • Year 1917
    Description Ap_Grade: ^0.84 Oz/Ton Au
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 24g/mt
  • Year 1921
    Description Ap_Grade: ^1.1 Oz/Ton Au, 2823.08 Oz/Ton Ag
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Silver Silver 79710g/mt
    Major Ore Gold Gold 31g/mt
  • Year 1921
    Description Ap_Grade: ^1.59 Oz/Ton Au, 2.2 Oz/Ton Ag
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Silver Silver 62g/mt
    Major Ore Gold Gold 45g/mt

Comments on the production information

  • PARTIAL PRODUCTION RECORD. FIGURES UNAVAILABLE FOR EARLY PRODUCTION FROM UNCLE SAM MINE. FIGURES ABOVE ARE INDIVIDUAL SMELTER SHIPMENTS FOR MAY ROSE ORE.

Comments on the workings information

  • PROPERTIES DEVELOPED BY NUMEROUS OPEN CUTS, SHORT TUNNELS, AND SEVERAL SHAFTS. ACROPOLIS CLAIM: 25-, 30-, 40-, 40-, AND 75-FT TUNNELS; ACROPOLIS EXTENSION CLAIM: 20-, 35-, AND 75-FT TUNNELS AND SHAFT OF UNKNOWN DEPTH; CRESSON CLAIM: 130-FT TUNNEL; IDEAL CLAIM: 65- AND 90-FT TUNNELS; MAYFLOWER CLAIM: 25-FT TUNNEL; MAYFLOWER NO. 1 CLAIM: 10-, 15-, AND 15-FT TUNNELS; MAY ROSE CLAIM: 40- AND 150-FT TUNNELS, 60-FT SHAFT, ONE SHAFT OF UNKOWN DEPTH; MAMMOTH CLAIM: 200-FT TUNNEL; MODEL CLAIM: 40-FT TUNNEL; SILVER KING CLAIM: 15-FT TUNNEL; TENNIE CLAIM: 50-FT TUNNEL; UNCLE SAM CLAIM: 154- AND 237-FT TUNNELS AND 175-FT TUNNEL WITH 280FT OF DRIFT; YLETIDE CLAIM: 15-FT TUNNEL, AMPARO ADIT DRIVEN GENERALLY S 30 W FOR 700 FT TO FACE, WITH WINZES AT 160 AND 360 FT FROM PORTAL.

Comments on development

  • UNCLE SAM CLAIM PRODUCED AU ORE FROM 1887 TO 1890 AND 1912-1917. PRODUCTION IN OTHER YEARS FROM OTHER CLAIMS UNKNOWN. LAST REPORTED PRODUCTION IN 1921. EXPLORATORY WORK DONE IN 1936-1937 BY AMPARO MINING CO, BUT NO ORE PRODUCED.

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. 67-68, 149-151.

  • Deposit

    CARAMOUZIS, BASIL, (N.D.), REPORT ON THE MAY ROSE MINES, LA PLATA COUNTY, COLORADO: UNPUB. ENG. REPT., 4 P.

  • Deposit

    COLORADO DIV. MINES INF. REPTS.

  • Production

    CARAMOUZIS (UNPUB ENG. REPT.)

General comments

Subject category Comment text
Deposit COUNTRY ROCK CONSISTS OF METAMORPHOSED CUTLER FM RED BEDS INTRUDED BY DIORITE-MONZONITE PORPHYRY SILLS GRADING INTO SYENITE. STEEPLY DIPPING VEINS STRIKE PREDOMINANTLY NW WITH A FEW AT NE AND CONSIST OF FRACTURE ZONES 0.5 TO 5 FT WIDE IN THOROUGHLY BRECCIATED AND SILICIFIED ROCK. ABUNDANT PYRITE FILLS BRECCIA-FRAGMENT INTERSTICES AND FORMS VEINLETS. ORE OXIDIZED TO LIMONITE NEAR SURFACE.
Deposit Discovery Year: 1880S

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-83 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.