The Sheridan Mine is a gold, silver, and copper mine located in La Plata county, Colorado at an elevation of 10,981 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: 10,981 Feet (3,347 Meters)
Commodity: Gold, Silver, Copper
Lat, Long: 37.60222, -107.62722
Map: View on Google Maps
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Sheridan Mine MRDS details
Site Name
Primary: Sheridan Mine
Secondary: Patented Claim: Sheridan
Secondary: Ms 19258
Commodity
Primary: Gold
Primary: Silver
Primary: Copper
Secondary: Lead
Secondary: 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
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
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, Eolus Batholith, Chicago Basin Stock, Trimble Stock
Alterations
Not available
Rocks
Name: Granite
Role: Host
Age Type: Host Rock Unit
Age in Years: 1466.000000+-27.000000
Dating Method: Rb-Sr
Age Young: Precambrian
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: Host 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: 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: 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: Host Rock
Age Young: Mesoproterozoic
Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock
Age Young: Miocene
Analytical Data
Analytical Data: CHEMICAL ANALYSIS SHOWED 0.4 PPM AU, 7800 PPM CU, 4000 PPM PB, 6000 PPM ZN, GT 100 PPM SB.
Analytical Data: DUMP AT LOWER ADIT CONTAINED 0.01 OZ/TON AU, 3.60 OZ/TON AG, 0.43% CU. SEMIQUANTITATIVE SPECTROGRAPHIC ANALYSIS OF SULFIDE-BEARING QUARTZ VEIN MATERIAL SHOWED 1000 PPM TI, 50 PPM MN, 70 PPM AG, 700 PPM AS, 500 PPM BA, 1000 PPM BI, 50 PPM CD, 5 PPM CR, 3000 PPM CU, 5 PPM MO, 3000 PPM PB, 1500 PPM SB, 150 PPM SN, 200 PPM SR, 20 PPM V, LT 50 PPM W, 5000 PPM ZN
Analytical Data: 5-FT CHIP SAMPLE FROM BACK OF UPPER PORTAL CONTAINED 0.02 OZ/TON AU, 4.86 OZ/TON AG, 0.51% CU, 0.40% PB, 0.76% ZN
Analytical Data: STEVEN AND OTHERS' (1969) ASSAYS OF UPPER DUMP SHOWED 0.02 OZ/TON AU, 2.70 OZ/TON AG, 0.26% CU, 0.52% ZN
Materials
Ore: Chalcopyrite
Ore: Sphalerite
Gangue: Quartz
Comments
Comment (Location): (LAND STATUS AND ADMINISTRATIVE AREA LOCATIONS CALCULATED USING GIS OVERLAY ANALYSIS FOR SAN JUAN N. F.). NORTH OF NEEDLE CREEK AT LOWER END OF CHICAGO BASIN 1.35 MILES WNW OF COLUMBINE PASS. ; INFO FROM LAND.ST :1974
Comment (Commodity): PRINCIPAL ORE MINERALS LISTED ARE BASED ON LIST FOR DISTRICT. OCCURRENCE OF OTHER AG AND CU SULFIDES UNVERIFIED.
Comment (Deposit): SMALL QUARTZ VEIN TRENDS N 10 W, 60 TO 90 NE AND LIES IN NNW-SSE-TRENDING REGIONAL FRACTURE SYSTEM. ZONE IS APPROX 30 FT WIDE AT UPPER PORTAL BUT TAPERS TO 10 FT AT POINT 250 FT NORTHWARD.
Comment (Workings): TWO TUNNELS DRIVEN ALONG VEIN AT N 10 W; CAVED, UNKNOWN EXTENT
References
Reference (Deposit): CROSS, WHITMAN, AND OTHERS, 1905, DESCRIPTION OF THE NEEDLE MOUNTAINS QUADRANGLE, COLORADO: USGS FOLIO 131.
Reference (Deposit): BLM MINERAL SURVEY MS 19258
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, 99, 166-167.
Colorado Mining Photos
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