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Tall Timber Group

Past Producer in Jefferson county in Colorado, United States with commodities Feldspar, Mica, Beryllium, Niobium (Columbium), Tantalum
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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. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Economic information about the deposit and operations
  12. Mining district
  13. Land status
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10101837
MRDS ID D010183
Record type Site
Current site name Tall Timber Group
Alternate or previous names Tall Timber Nos. 1, And 3

Geographic coordinates

Geographic coordinates: -105.27252, 39.64582 (WGS84)
Elevation 2195
Relative position 7.6 MILES S 10 W FROM GOLDEN

Site location context

Political divisions (FIPS codes)

Jefferson(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Evergreen(quadrangle 1:24,000 scale)

Denver West(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)

Geographic areas

Country State County
United States Colorado Jefferson

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 005S 070W 06 NW Colorado

Comments on the location information

  • ALONG UNNAMED TRIBUTARIES OF BEAR CREEK 3 TO 3.5 MILES NE OF EVERGREEN. ELEV AND LAT-LONG GIVEN ARE FOR APPROX CENTER NW SEC. 06 ; INFO FROM LAND.ST :(1975)

Commodities

Commodity Importance
Feldspar Primary
Mica Primary
Beryllium Critical Primary
Niobium (Columbium) Critical Tertiary
Tantalum Critical Tertiary

Materials information

Materials Type of material
Beryl Ore
Columbite Ore
Muscovite Ore
Tantalite Ore
Garnet Gangue
Tourmaline Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Pegmatite
    Rock unit name Pegmatite
    Rock description Pegmatite
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss
    Rock unit name Idaho Springs Formation---Feldspar-Rich Gneiss;Idaho Springs Formation---Amphibolite
    Rock description Idaho Springs Formation---Feldspar-Rich Gneiss;Idaho Springs Formation---Amphibolite

Nearby scientific data

(1) -105.27252, 39.64582
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Front Range Uplift, Denver Basin
Type of structure Local
Structure description Floyd Hill Fault Zone

Economic information about the deposit and operations

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

Mining district

District name Clear Creek Pegmatite Province

Land status

Ownership category Private

Comments on the production information

  • ESTIMATED PRODUCTION FROM TALL TIMBERS NOS. 1 AND 3; SMALL PRODUCTION LISTED FOR NO. 3; YEARS UNKNOWN

Comments on the workings information

  • TWO LARGE OPEN CUTS, SEVERAL SMALL OPEN CUTS, ONE TUNNEL

Comments on development

  • OPERATED INTERMITTENTLY FOR FELDSPAR, SCRAP MICA, AND BERYL

Reference information

Bibliographic references

  • Deposit

    SHERIDAN, D.M., AND OTHERS, 1972, GEOLOGIC MAP OF THE EVERGREEN QUADRANGLE, JEFFERSON COUNTY, COLORADO: USGS MAP I-786-A.

  • Deposit

    MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 29

  • Deposit

    USBM MIN. EXAM. FILE, REPTS. OF 4/6/59 AND 2/9/59 (FROM ORIGINAL CRIB RECORD)

  • Production

    ORIGINAL CRIB RECORDS (PROBABLY USBM REFERENCE)

General comments

Subject category Comment text
Deposit ZONED PEGMATITES LIE IN FELDSPAR-RICH GNEISS

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1983 Schwochow, Stephen D. Colorado Geological Survey
Updater 01-MAY-1993 Spanski, Gregory T. U.S. 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.