The Little Jim Mine is a silver and gold mine located in La Plata county, Colorado at an elevation of 11,240 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: 11,240 Feet (3,426 Meters)
Commodity: Silver, Gold
Lat, Long: 37.61083, -107.60778
Map: View on Google Maps
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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.
Little Jim Mine MRDS details
Site Name
Primary: Little Jim Mine
Secondary: Patented Claims: Little Jim, MS 4520
Secondary: Southern Corss, MS 4520
Secondary: E.A.K., MS 4520
Commodity
Primary: Silver
Primary: Gold
Secondary: Lead
Secondary: Copper
Tertiary: Zinc
Tertiary: Manganese
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: 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: 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+-27.000000
Dating Method: Rb-Sr
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: 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+-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: 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+-20.000000
Dating Method: U-Pb (zircon)
Material Analyzed: Zircon
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: 1460.000000+-70.000000
Dating Method: K-Ar
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: 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: Associated Rock Unit
Age in Years: 9.000000+-0.900000
Material Analyzed: Zircon
Age Young: Miocene
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
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+-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: 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+-27.000000
Dating Method: Rb-Sr
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
Analytical Data
Analytical Data: 5-FT-CHIP SAMPLE FROM FACE OF MAIN TUNNEL CONTAINED 2.44 OZ/TON AG, 0.28 % CU, 0.40 % CU, 0.40 % PB, 4.40 % ZN. SEMIQUANTITATIVE SPECTROGRAPHIC ANALYSES OF TWO FOUR QUARTZ VEIN SAMPLES CONTAINED 200 TO 1000 PPM TI, 300 TO GT 5000 PPM MN, 2 TO 1000 PPM AG, LT 200 PPM AS, 100 TO 300 PPM AS, 100 TO 300 PPM BA, LT 10 PPM BI, LT 20 TO 30 PPM CD, LT 5 PPM CR, 5 TO 7000 PPM CU, 20 TO 30 PPM MO, 20 TO GT 20000 PPM PB, LT 100 TO 300/ PPM SB, LT 10 PPM SN, LT 100 PPM SR, 20 TO 50 PPM V, LT 50 PPM W, LT 550 TO GT 10000 PPM ZN. CHEMICAL ANALYSIS SHOWED LT 0.02 TO 0.30 PPM AU, LT 10 TO 4600 PPM CU, 34 TO 2500 PPM PB, LT 25 T/ 5300 PPM ZN, 2 TO 6 PPM SB.
Analytical Data: STEVEN AND OTHERS' (196) ASSAY OF 5-FT CHIP SAMPLE FROM FACE OF STUB DRIFT 390 FT FROM PORTAL CONTAINED 0.04 OZ/TON AU, 1.92 OZ/TON AG
Materials
Ore: Chalcopyrite
Ore: Silver
Ore: Argentite
Ore: Sphalerite
Ore: Tetrahedrite
Gangue: Quartz
Gangue: Rhodochrosite
Gangue: Fluorite
Comments
Comment (Location): (LAND STATUS AND ADMINISTRATIVE AREA LOCATIONS CALCULATED USING GIS OVERLAY ANALYSIS FOR SAN JUAN N. F.). ON SE SIDE OF NEEDLE CREEK AND CHICAGO BASIN 0.9 MILE WSW OF JUPITER MTN AND 0.9 MILE NW OF COLUMBINE PASS. ; INFO FROM LAND.ST :1974
Comment (Deposit): QUARTZ VEIN TRENDS N 75 E, DIPS VERTICAL, AND IS PART OF EAST-WEST-TRENDING REGIONAL RECTANGULAR FRACTURE SYSTEM.
Comment (Workings): ONE TUNNEL HEADING ALONG VEIN AT N 75 E FOR 470 FT
References
Reference (Deposit): SCHMITT, L.J., AND RAYMOND, W.H., 1977, GEOLOGY AND MINERAL DEPOSITS OF THE NEEDLE MOUNTAINS DISTRICT, SOUTH-WESTERN 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, 96. 160-163.
Reference (Deposit): CROSS, WHITMAN, AND OTHERS, 1905, DESCRIPTION OF THE NEEDLE MOUNTAINS QUADRANGLE, COLORADO: USGS FOLIO 131.
Reference (Deposit): BLM MINERAL SURVEY MS 4520
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