Eurydice Mine

The Eurydice Mine is a gold and silver mine located in Conejos county, Colorado at an elevation of 9,859 feet.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Eurydice Mine
Secondary: Patented Claims: Eurydice, MS 7760
Secondary: Orpheus, MS 7760
Secondary: Louisa, MS 7760
Secondary: No. 10, MS 7000

Commodity

Primary: Gold
Primary: Silver
Tertiary: Copper
Tertiary: Lead

Location

State: Colorado
County: Conejos
District: Decatur West (Stunner) District

Land Status

Land ownership: Private
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Type: Underground

Ownership

Owner Name: George L. And Katherine T. Patterson
Home Office: New York City, Ny.
Years: 1938 -

Owner Name: Stunner Mines, Inc.
Home Office: Monte Vista
Years: 1938 -

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: Vein
Operation Type: Unknown
Year Last Production: 1938
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains

Mineral Deposit Model

Model Name: Polymetallic veins

Orebody

Not available

Structure

Type: R
Description: San Juan Volcanic Field

Type: L
Description: Platoro Caldera, Summitville Caldera, Alamosa River Stock, Summitville Fault, Platoro Fault Zone

Alterations

Not available

Rocks

Name: Monzonite
Role: Associated
Age Type: Host Rock Unit
Age in Years: 29.100000+-
Dating Method: K-Ar
Age Young: Oligocene

Name: Monzonite
Role: Host
Age Type: Host Rock Unit
Age in Years: 29.100000+-
Dating Method: K-Ar
Age Young: Oligocene

Analytical Data

Analytical Data: SIX MILL RUN ASSAYS FROM JULY-SEPT 1891 SHOWED 0.63 OZ/TON AU AND 29.83 OZ/TON AG, 0.23 OZ/TON AU AND 18.76 OZ/TON AG, 0.25 OZ/TON AU AND 22.67 OZ/TON AG, 0.15 OZ/TON AU AND 14.70 OZ/TON AG, 0.151 OZ/TON AU AND 17.75 OZ/TON AG, 0.24 OZ/TON AU AND 32.65 OZ/TON AG. NINE ASSAYS BY H.E. WOOD FROM MARCH 1891 TO FEB 1892 SHOWED 2.10 OZ/TON AU AND 21 OZ/TON AU AND 1760 OZ/TON AG, 0.10 OZ/TON AU AND 2049 OZ/TON AG, 0.04 OZ/TON AU AND 573.50 OZ/TON AG, 21.50 OZ/TON AU AND 529.50 OZ/TON AG, 0.05 OZ/TON AU AND 500 OZ/TON AG, 26.75 OZ/TON AU AND 25.30 OZ/TON AG, 27.04 OZ/TON AU AND 1138.60 OZ/TON AG, 2.80 OZ/TON AU AND 398.20 OZ/TON AG (ALL SPECIMEN MATERIAL). IN MINE, ALTERED ROCK CONTAINED 0.06 TO 0.5 OZ/TON AU AND 0.26 TO 10 OZ/TON AG. REFERENCE SPECIMENS CONTAINED 0.2 TO 1.33 OZ/TON AU AND 6.25 OZ/TON AG. SELECTED ORE SAMPLES CONTAINED 1 TO 7.3 OZ/TON AU AND 0.32 TO 553.30 OZ/TON AG.

Materials

Ore: Tetrahedrite
Ore: Petzite
Ore: Pyrite
Ore: Galena
Gangue: Quartz

Comments

Comment (Deposit): POST-SUMMITVILLE-COLLAPSE IGNEOUS ACTIVITY INCLUDES EMPLACEMENT OF ALAMOSA RIVER MONZONITE STOCK ALONG SOUTH BOUNDING CORNWALL RING FAULT AND LOCAL VOLCANIC VENTS--SHEEPSHEAD, LOOKOUT MTN, ELEPHANT MTN. POST-INTRUSION EXTENSIONAL FAULTING MANIFESTED IN PLATORO FAULT ZONE TO SE AND SUMMITVILLE FAULT TO NW. EURYDICE VEIN LIES IN N 35 W-TRENDING FAULT THAT COULD BE EITHER SE EXTENSION OF SUMMITVILLE FAULT (AS INTERPRETED BY CALKIN, 1967) OR INTERMEDIATE ZONE BETWEEN SUMMITVILLE FAULT AND PLATORO FAULT ZONE. FAULT PLANES PROBABLY DISPLAY CALKIN'S SELECTIVE ALTERATION SUPERPOSED ACROSS HYDROTHERMAL ALTERATION OF ALAMOSA RIVER STOCK AND ALUM CREEK PORPHYRY.

Comment (Workings): EURYDICE SHAFT SUNK 300 FT ON VEIN WITH SMALL NW-SW DRIFTS AT 20, 65, 110, 120, 230, AND 265 LEVELS. PRINCIPAL, DRIFT AT 190 LEVEL IS 680 FT TO SE WITH CROSSCUT OF UNKNOWN LENGTH AT 600 FT FROM SHAFT AND WITH STOPES AT SHAFT AND AT 500 FT FROM SHAFT. STOPE AT SHAFT ON 230 LEVEL. 350 FT SE OF SHAFT IS 150-FT LOUISA TUNNEL ALSO ON VEIN. 160 FT FARTHER SE IS 50-FT LOUISA SHAFT. 35-TPD FLOTATION MILL AT SHAFT.

Comment (Location): SE OF ALAMOSA RIVER JUST ACROSS FROM ALUM CREEK CONFLUENCE AND AT MOUTH OF EURYDICE CREEK, 1.65 MILES SE OF LOOKOUT MTN. ; INFO FROM LAND.ST :1975

Comment (Production): PARTIAL PRODUCTION RECORD. 1938 IS LAST YEAR OF REPORTED PRODUCTION (DUMP ORE). NO RECORDS AVAILABLE FOR YEARS PRIOR TO 1938.

Comment (Development): MINE INACTIVE SINCE 1893, BUT SOME DUMP ORE MILLED IN 1938 (LAST REPORTED PRODUCTION)

References

Reference (Deposit): PATTON, H.B., 1917, GEOLOGY AND ORE DEPOSITS OF THE PLATORO-SUMMITVILLE MINING DISTRICT, COLORADO: CGS BULL. 13.

Reference (Deposit): LIPMAN, P.W., 1974, GEOLOGIC MAP OF THE PLATORO CALDERA AREA, SOUTHEASTERN SAN JUAN MOUNTAINS, SOUTHWESTERN COLORADO: USGS MAP I-828.

Reference (Deposit): CALKIN, W.S., 1967, GEOLOGY, ALTERATION, AND MINERALIZATION OF THE ALUM CREEK AREA. SAN JUAN VOLCANIC FIELD. COLORADO: COLORADO SCHOOL OF MINES THESIS T-1113.

Reference (Deposit): COLORADO DIV. MINES INF. REPT.

Reference (Deposit): BLM MINERAL SURVEY MS 7760, 7000

Colorado Mining Photos

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