| Deposit ID | 10014084 |
|---|---|
| MRDS ID | D010708 |
| Record type | Site |
| Current site name | Little Jim Mine |
| Alternate or previous names | Patented Claims: Little Jim, MS 4520, Southern Corss, MS 4520, E.A.K., MS 4520 |
| Related records | 10142238 |
| Geographic coordinates: | -107.60841, 37.61084 (WGS84) |
|---|---|
| Elevation | 3426 |
| Relative position | 14 MILES S 14 E FROM SILVERTON |
Political divisions (FIPS codes)
La Plata(county)
Colorado(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Columbine Pass(quadrangle 1:24,000 scale)
Silverton(quadrangle 1:100,000 scale)
Durango(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Animas(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)
Weminuche Wilderness(Wilderness)
Wilderness FS(Type of land area)
FS(Federal land areas administered by FS)
| Country | State | County |
|---|---|---|
| United States | Colorado | La Plata |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| New Mexico | 039N | 007W | 26,35 | S2 OF S2 (26); N2 OF N2 (35) | Colorado |
| Commodity | Importance |
|---|---|
| Gold | Primary |
| Silver | Primary |
| Copper | Secondary |
| Lead | Secondary |
| Zinc Critical | Tertiary |
| Manganese Critical | Tertiary |
| Materials | Type of material |
|---|---|
| Argentite | Ore |
| Chalcopyrite | Ore |
| Silver | Ore |
| Sphalerite | Ore |
| Tetrahedrite | Ore |
| Fluorite | Gangue |
| Quartz | Gangue |
| Rhodochrosite | Gangue |
| Result | 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 |
|---|---|
| Result | 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. |
| Model code | 85 |
|---|---|
| USGS model code | 22c |
| Deposit model name | Polymetallic veins |
| Mark3 model number | 46 |
| Host or associated | Associated | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rock type | Plutonic Rock > Granitoid > Quartz Monzonite | ||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||
| Host or associated | Associated | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite | ||||||||||||
| |||||||||||||
| Host or associated | Associated | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rock type | Plutonic Rock > Granitoid > Granite | ||||||||||||||||||||||||||||||||
| Rock unit name | Eolus Granite;Intrusive Bodies And Related Rocks (Younger And Older Bodies Of Chicago Basin Stock) | ||||||||||||||||||||||||||||||||
| Rock description | Eolus Granite;Intrusive Bodies And Related Rocks (Younger And Older Bodies Of Chicago Basin Stock) | ||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||
| Host or associated | Host | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rock type | Plutonic Rock > Granitoid > Quartz Monzonite | ||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||
| Host or associated | Host | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rock type | Plutonic Rock > Granitoid > Granite | ||||||||||||||||||||||||||||||||
| Rock unit name | Eolus Granite | ||||||||||||||||||||||||||||||||
| Rock description | Eolus Granite | ||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||
| (1) | -107.60841, 37.61084 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | San Juan Uplift, San Juan Basin, San Juan Volcanic Field |
| Type of structure | Local |
| Structure description | Needle Mtns Uplift, Chicago Basin Stock, Eolus Batholith, Trimble Stock |
| Thickness | 3.05M |
|---|
| Development status | Past Producer |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| Discoverer | Duncan Mckercher And Others (Claimants) |
| District name | Needle Mountain (Tacoma, Florida, Vallecito) District |
|---|
| Ownership category | National Forest |
|---|---|
| Area name | San Juan N. F. |
| Type of workings | Underground |
|---|---|
| Length | 143.26M |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | D010708 |
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.
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.
CROSS, WHITMAN, AND OTHERS, 1905, DESCRIPTION OF THE NEEDLE MOUNTAINS QUADRANGLE, COLORADO: USGS FOLIO 131.
BLM MINERAL SURVEY MS 4520
| Subject category | Comment text |
|---|---|
| Deposit | QUARTZ VEIN TRENDS N 75 E, DIPS VERTICAL, AND IS PART OF EAST-WEST-TRENDING REGIONAL RECTANGULAR FRACTURE SYSTEM. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-JUL-1983 | Schwochow, Stephen D. | Colorado Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
These are landing pages for further research — the state agencies don't currently expose per-mine deep links.