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  3. Mineral Resource Data System (MRDS)

Little John Mine

Occurrence in Park county in Colorado, United States with commodities Beryllium, Molybdenum, Tungsten, Uranium, Lead, Zinc, Arsenic, Iron, Copper, Tin
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Land status
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10013790
MRDS ID D010279
Record type Site
Current site name Little John Mine
Alternate or previous names Little John No. 1, Little John No. 2

Geographic coordinates

Geographic coordinates: -105.42197, 39.07167 (WGS84)
Elevation 2560
Relative position 7.15 MILES N 27 W OF LAKE GEORGE (TOWN)

Site location context

Political divisions (FIPS codes)

Park(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Tarryall(quadrangle 1:24,000 scale)

Bailey(quadrangle 1:100,000 scale)

Denver(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

South Platte Headwaters(hydrologic unit)

South Platte(hydrologic accounting unit)

South Platte(hydrologic subregion)

Missouri(hydrologic region)

Federal lands

Pike and San Isabel National Forests(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Colorado Park

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 011S 072W 22 W2 OF SE SE Colorado

Comments on the location information

  • MARY LEE MINE AREA ; INFO FROM LAND.ST :(1976)

Commodities

Commodity Importance
Beryllium Critical Primary
Molybdenum Secondary
Tungsten Critical Secondary
Uranium Secondary
Lead Tertiary
Zinc Critical Tertiary
Arsenic Critical Tertiary
Iron Tertiary
Copper Tertiary
Tin Critical Tertiary

Comments on the commodity information

  • NONPEGMATITIC BERYLLIUM DEPOSITS; BERYL OCCURS AS HEXAGONAL CRYSTALS AND MASSIVE POIKILOBLASTIC GRAINS.

Materials information

Materials Type of material
Bertrandite Ore
Beryl Ore
Cassiterite Ore
Chalcopyrite Ore
Covellite Ore
Euclase Ore
Galena Ore
Molybdenite Ore
Pyrite Ore
Sphalerite Ore
Uraninite Ore
Wolframite Ore
Fluorite Gangue
Muscovite Gangue
Quartz Gangue
Siderite Gangue
Topaz Gangue

Alteration

  • (Local) Greisenization

Analytical data

Result MASSES OF GALENA CONTAIN 0.3-0.7% AG, 0.3-1.5% BI, 0.007-0.7% CU
Result 0.0007% BE, 0.015% CU, 0.07% PB, 0.015% SN (FROM LITTLE JOHN NO.1 SHAFT)

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
    Rock unit name Redskin Granite;Boulder Creek Granodiorite (Gneiss)
    Rock description Redskin Granite;Boulder Creek Granodiorite (Gneiss)
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite

Nearby scientific data

(1) -105.42197, 39.07167
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Tarryall Mountains, Front Range, Puma Hills, Badger Flats
Type of structure Local
Structure description Badger Flats Fault, Minor Faults, Round Mountain Syncline

Ore body information

  • General form CUPOLAS, PODS, IRREGULAR LENSES

Controls for ore emplacement

  • Greisenized Rocks; Localized By Fissures, Contacts, Favorable Rock Units

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1955

Mining district

District name Lake George (Badger Flats) Beryllium Area (Mountain Dale District)

Land status

Ownership category National Forest

Comments on the workings information

  • SHAFTS, PITS, TRENCHES

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit THE REDSKIN STOCK IS ZONED, WITH NEARLY ALL OF THE BERYLLIUM DEPOSITS OCCURRING IN THE GRANITE-APLITE OR PORPHYRITIC GRANITE FACIES OF THE GREISENIZED REDSKIN GRANITE. EVEN THOSE DEPOSITS NOT ACTUALLY IN THE REDSKIN GRANITE ARE SPATIALLY AND GENETICALLY RELATED TO IT.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1983 Collins, Donna B. Colorado Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Colorado resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.