I and L Prospect 3

Occurrence in Alaska, United States with commodities Uranium, Thorium, REE

Geologic information

Identification information

Deposit ID 10000235
MRDS ID A010272
Record type Site
Current site name I and L Prospect 3
Alternate or previous names I and L Prospect 4, I and L Prospect 1, I and L Prospect 2, Limestone Creek, Bedrock Creek, Kramer Cree, Ptormigan Creek, Russian John Creek
Related records 10282632

Geographic coordinates

Geographic coordinates: -132.13788, 54.91751 (WGS84)
Elevation 366
(click for info)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Uranium Primary
Thorium Primary
REE Tertiary

Materials information

Materials Type of material
Brannerite Ore
Parisite Ore
Uraninite Ore
Xenotime Ore
Albite Gangue
Ilmenite Gangue
Quartz Gangue
Sphene Gangue
Zircon Gangue

Alteration

  • (Local) Feldspars In Pegmatite Are Altered To Clay Minerals

Analytical data

Result CHEMICAL ANALYSIS OF 10 CHIP SAMPLES: MAXIMA 0.95% U
Result AVERAGE 0.18% U. 3 THORIUM SAMPLES AVERAGED 0.16%

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite > Peralkaline Granite
    Chronological age 186
    Dating method K-Ar
    Stratigraphic age (youngest) Middle Jurassic
    Chronological age 181
    Dating method K-Ar
    Stratigraphic age (youngest) Middle Jurassic
    Chronological age 171
    Dating method U-Pb (zircon)
    Type of media Zircon
    Stratigraphic age (youngest) Middle Jurassic
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite > Peralkaline Granite
    Chronological age 186
    Dating method K-Ar
    Stratigraphic age (youngest) Middle Jurassic
    Chronological age 181
    Dating method K-Ar
    Stratigraphic age (youngest) Middle Jurassic
    Chronological age 171
    Dating method U-Pb (zircon)
    Type of media Zircon
    Stratigraphic age (youngest) Middle Jurassic

Nearby scientific data

(1) -132.13788, 54.91751

Ore body information

  • Strike N60-90W
    Dip VERTICAL
    Thickness 0.3M
    Length 30.48M

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1955
Discoverer I And L Hollenbeak

Mining district

District name Ketchikan District

Land status

Ownership category National Forest

Comments on the workings information

  • SEVERAL TRENCHES AND SMALL OPEN PITS

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010272

Bibliographic references

  • Deposit

    USGS BULLETIN 1154, P. 85-88

  • Deposit

    USGS CIRCULAR 751-B, P. B74-B 75

  • Deposit

    USGS OPEN FILE 78-863, P. 6-8

General comments

Subject category Comment text
Deposit SEVERAL SUBPARALLEL DIKES ARE DISCONTINUOUS AND CONTAIN VEINLETS IN FRACTURES

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-1983 Hirschmann, M. M. (Elliott, R. L.) U.S. Geological Survey