The Eureka Mine is a gold and silver mine located in La Plata county, Colorado at an elevation of 12,480 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
Elevation: 12,480 Feet (3,804 Meters)
Commodity: Gold, Silver
Lat, Long: 37.60056, -107.59806
Map: View on Google Maps
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.
Eureka Mine MRDS details
Site Name
Primary: Eureka Mine
Secondary: Patented Claim: Eureka
Secondary: Ms 5620
Commodity
Primary: Gold
Primary: Silver
Secondary: Copper
Secondary: Lead
Tertiary: Manganese
Tertiary: Zinc
Location
State: Colorado
County: La Plata
District: Needle Mountain (Tacoma, Florida, Vallecito) District
Land Status
Land ownership: National Forest
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.
Administrative Organization: San Juan N. F.
Holdings
Not available
Workings
Type: Underground
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Deposit Type: Vein
Operation Type: Unknown
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 Uplift, San Juan Basin, San Juan Volcanic Field
Type: L
Description: Needle Mtns Uplift, Chicago Basin Stock, Eolus Batholith, Trimble Stock
Alterations
Not available
Rocks
Name: Granite
Role: Host
Age Type: Host Rock Unit
Age in Years: 1460.000000+-70.000000
Dating Method: K-Ar
Age Young: Precambrian
Name: Granite
Role: Host
Age Type: Associated Rock Unit
Age in Years: 9.000000+-0.900000
Material Analyzed: Zircon
Age Young: Miocene
Name: Granite
Role: Host
Age Type: Associated Rock Unit
Age in Years: 1466.000000+-20.000000
Dating Method: U-Pb (zircon)
Material Analyzed: Zircon
Age Young: Precambrian
Name: Granite
Role: Host
Age Type: Associated Rock Unit
Age in Years: 10.100000+-1.100000
Material Analyzed: Zircon
Age Young: Miocene
Name: Granite
Role: Host
Age Type: Associated Rock Unit
Age in Years: 1466.000000+-27.000000
Dating Method: Rb-Sr
Age Young: Precambrian
Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock Unit
Age in Years: 10.100000+-1.100000
Material Analyzed: Zircon
Age Young: Miocene
Name: Quartz Monzonite
Role: Associated
Age Type: Host Rock Unit
Age in Years: 1460.000000+-70.000000
Dating Method: K-Ar
Age Young: Precambrian
Name: Quartz Monzonite
Role: Associated
Age Type: Host Rock Unit
Age in Years: 1466.000000+-20.000000
Dating Method: U-Pb (zircon)
Material Analyzed: Zircon
Age Young: Precambrian
Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock Unit
Age in Years: 9.000000+-0.900000
Material Analyzed: Zircon
Age Young: Miocene
Name: Quartz Monzonite
Role: Associated
Age Type: Host Rock Unit
Age in Years: 1466.000000+-27.000000
Dating Method: Rb-Sr
Age Young: Precambrian
Name: Granite
Role: Associated
Age Type: Host Rock Unit
Age in Years: 1460.000000+-70.000000
Dating Method: K-Ar
Age Young: Precambrian
Name: Granite
Role: Associated
Age Type: Associated Rock Unit
Age in Years: 1466.000000+-20.000000
Dating Method: U-Pb (zircon)
Material Analyzed: Zircon
Age Young: Precambrian
Name: Granite
Role: Associated
Age Type: Associated Rock Unit
Age in Years: 9.000000+-0.900000
Material Analyzed: Zircon
Age Young: Miocene
Name: Granite
Role: Associated
Age Type: Associated Rock Unit
Age in Years: 10.100000+-1.100000
Material Analyzed: Zircon
Age Young: Miocene
Name: Granite
Role: Associated
Age Type: Associated Rock Unit
Age in Years: 1466.000000+-27.000000
Dating Method: Rb-Sr
Age Young: Precambrian
Name: Quartz Monzonite
Role: Host
Age Type: Associated Rock Unit
Age in Years: 9.000000+-0.900000
Material Analyzed: Zircon
Age Young: Miocene
Name: Quartz Monzonite
Role: Host
Age Type: Host Rock Unit
Age in Years: 1460.000000+-70.000000
Dating Method: K-Ar
Age Young: Precambrian
Name: Quartz Monzonite
Role: Host
Age Type: Associated Rock Unit
Age in Years: 10.100000+-1.100000
Material Analyzed: Zircon
Age Young: Miocene
Name: Quartz Monzonite
Role: Host
Age Type: Host Rock Unit
Age in Years: 1466.000000+-20.000000
Dating Method: U-Pb (zircon)
Material Analyzed: Zircon
Age Young: Precambrian
Name: Quartz Monzonite
Role: Host
Age Type: Host Rock Unit
Age in Years: 1466.000000+-27.000000
Dating Method: Rb-Sr
Age Young: Precambrian
Name: Rhyolite
Role: Associated
Age Type: Associated Rock Unit
Age in Years: 10.100000+-1.100000
Material Analyzed: Zircon
Age Young: Miocene
Name: Rhyolite
Role: Associated
Age Type: Associated Rock Unit
Age in Years: 9.000000+-0.900000
Material Analyzed: Zircon
Age Young: Miocene
Analytical Data
Analytical Data: CHEMICAL ANALYSES SHOWED 0.06 TO 0.10 PPM AU, 860 TO 7000 PPM CU, 10000 TO 14000 PPM PB, 120000 TO 250000 PPM ZN, GT 100 PPM SB.
Analytical Data: STEVEN AND OTHERS' (1969) ASSAY OF SELECTED DUMP SAMPLE CONTAINED 0.01 OZ/TON AU, 1.40 OZ/TON AG, 1.04 % CU, 3.40 % CU, 3.40 % PB, 5.98 % ZN. SEMIQUANTITATIVE SPECTROGRAPHIC ANALYSES OF THREE SULFIDE-BEARING QUARTZ VEIN SAMPLES SHOWED 10 TO 200 PPM TI, 1500 TO GT 5000 PPM MN, 30 TO 150 PPM AG, LT 200 TO 700 PPM AS, 70 TO 3000 PPM BA, LT 10 TO 200 PPM BI, LT 500 PPM CD, LT 5 TO 5 PPM CR, 700 TO 5000 PPM CU, 7 TO 15 PPM MO, GT 20000 PPM PB, 150 TO 3000 PPM SB, LT 10 TO 150 PPM SN, LT 100 TO 150 PPM SN, LT 100 TO 150 PPM SR, 10 TO 20 PPM V, LT 50 TO 70 PPM W, GT 10000 PPM ZN
Materials
Ore: Sphalerite
Gangue: Quartz
Gangue: Rhodochrosite
Gangue: Fluorite
Comments
Comment (Deposit): MINE DEVELOPED ON SMALL QUARTZ VEIN TRENDING N 20 W, 45 TO 65 NE, AND LYING IN GENERALLY NNW-SSE-TRENDING REGIONAL RECTANGULAR FRACTURE SYSTEM.
Comment (Workings): 20-FT FLOODED ADIT HEADING N 20 W; MAIN ADIT DRIVEN 395 FT HEADING GENERALLY NNW WITH CROSSCUTS OF 35 AND 50 FT.
Comment (Location): (LAND STATUS AND ADMINISTRATIVE AREA LOCATIONS CALCULATED USING GIS OVERLAY ANALYSIS FOR SAN JUAN N. F.). IN UPPER VALLECITO BASIN JUST NORTH OF COLUMBINE LAKE, 0.3 MILE NE OF COLUMBINE PASS. ; INFO FROM LAND.ST :1974
References
Reference (Deposit): SCHMITT, L.J., AND RAYMOND, W.H., 1977, GEOLOGY AND MINERAL DEPOSITS OF THE NEEDLE MOUNTAINS DISTRICT, SOUTHWESTERN COLORADO: USGS BULL. 1434, 40 P.
Reference (Deposit): STEVEN, T.A., AND OTHERS, 1969, MINERAL RESOURCES OF THE SAN JUAN PRIMITIVE AREA, COLORADO: USGS BULL. 1261-F, P.30-32, 55-67, 102, 162-163.
Reference (Deposit): CROSS, WHITMAN, AND OTHERS, 1905, DESCRIPTION OF THE NEEDLE MOUNTAINS QUADRANGLE, COLORADO: USGS FOLIO 131.
Reference (Deposit): BLM MINERAL SURVEY MS 5620
Colorado Mining Photos
Check out this collection of Colorado's best historic mining photos: Incredible Photos of Colorado Mining Scenes.
