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  3. Mineral Resource Data System (MRDS)

Big Bear No. 2 Mine

Past Producer in Jefferson county in Colorado, United States with commodities Feldspar, REE
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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. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Workings at the site
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10087823
MRDS ID D010179
Record type Site
Current site name Big Bear No. 2 Mine
Alternate or previous names Big Bear, Little Bear

Geographic coordinates

Geographic coordinates: -105.21169, 39.37583 (WGS84)
Elevation 2210
Relative position 18.5 MILES S 19 E FROM EVERGREEN

Site location context

Political divisions (FIPS codes)

Jefferson(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Platte Canyon(quadrangle 1:24,000 scale)

Bailey(quadrangle 1:100,000 scale)

Denver(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper South Platte(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 Jefferson

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 008S 070W 03 SW OF SE Colorado

Comments on the location information

  • NEAR HEAD OF UNNAMED TRIBUTARY OF SPRING CREEK 1.9 MILES NNW OF LONG SCRAGGY PEAK ; INFO FROM LAND.ST :(1975)

Commodities

Commodity Importance
Feldspar Primary
REE Critical Primary

Materials information

Materials Type of material
Microcline Ore
Allanite Gangue
Amethyst Gangue
Doverite Gangue
Fluorite Gangue
Gadolinite Gangue
Monazite Gangue
Xenotime Gangue

Alteration

  • (Local) Rae Replacement Of Fluorite

Analytical data

Result HAND-PICKED FLUORITIC ORE FROM BIG BEAR AND OTHER PEGMATITES ASSAYED 1 TO 7.5% Y. RAE CONCENTRATES CONTAINED 47.9% Y, 2.8% GD, 2.3% DY, 3.7% ND, 1 TO 2% ER, SM, AND CE
Result 0 TO 1% HO, LA, TB, PR.

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Pegmatite
    Rock unit name Pegmatite;Pikes Peak Granite
    Rock description Pegmatite;Pikes Peak Granite
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
  • Host or associated Host
    Rock type Plutonic Rock > Pegmatite
    Rock unit name Pegmatite;Pikes Peak Granite
    Rock description Pegmatite;Pikes Peak Granite

Nearby scientific data

(1) -105.21169, 39.37583
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Front Range Uplift, Pikes Peak Batholith
Type of structure Local
Structure description Kennedy Gulch Fault Zone

Ore body information

  • General form ELLIPSOIDAL
    Length 96.01M
    Width 50.29M

Economic information about the deposit and operations

Development status Past Producer
Commodity type Both
Deposit size Small
Significant No

Mining district

District name South Platte Pegmatite District

Land status

Ownership category National Forest

Workings at the site

  • Type of workings Unknown
    Length 82.3M

Comments on the workings information

  • TWO OPEN CUTS

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit LARGER ELLIPSOIDAL PEGMATITE CONTAINS RELATIVELY THICK WALL ZONE OF QUARTZ-MICROCLINE-BIOTITE AND MICROCLINE-QUARTZ CORE THAT IS TRANSECTED BY LARGE REPLACEMENT UNIT OF FLUORITE AND YTTROFLUORITE AND OTHER RAE. TWO QUARTZ SUBCORES MAPPED IN EXTENSION OF BODY TO NW. OTHER SMALL QUARTZ CORES ISOLATED IN GRANITE BETWEEN MAIN DEPOSITS. SMALLER PEGMATITE TO SE CONTAINS SIMILAR REPLACEMENT UNIT AND REPLACEMENT(?) AMETHYST.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1983 Schwochow, Stephen D. 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.