Jensen Prospect

Occurrence in Alaska, United States with commodities Copper, Gold, Silver

Geologic information

Identification information

Deposit ID 10093948
MRDS ID A010416
Record type Site
Current site name Jensen Prospect
Alternate or previous names Glacier Island, Claims: Portsmouth, Scotia Bell
Related records 10113036

Geographic coordinates

Geographic coordinates: -147.10172, 60.88764 (WGS84)
Location accuracy 500(meters)
(click for info)

Geographic areas

Country State
United States Alaska

Comments on the location information

  • DEPOSIT NUMBER IS THE MAP LOCATION NUMBER FROM MF-880A. LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Commodities

Commodity Importance
Copper Primary
Gold Secondary
Silver Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Epidote Gangue
Quartz Gangue

Alteration

  • (Local) Basalt Altered To Greenstone

Analytical data

Result ASSAYS SHOW TRACE OF GOLD AND SILVER

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
    Stratigraphic age (youngest) Paleocene
    Stratigraphic age (youngest) Paleocene
    Stratigraphic age (youngest) Paleocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
    Rock unit name Orla Group
    Rock description Orla Group

Nearby scientific data

(1) -147.10172, 60.88764

Ore body information

  • Strike N20E-N5W
    Dip 65-70W

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No
Discoverer Jens Jensen

Workings at the site

  • Type of workings Surface/Underground
    Name of workings TUNNEL
    Length 152.4M
  • Type of workings Surface/Underground
    Name of workings TUNNEL
    Length 76.2M
  • Type of workings Surface/Underground
    Name of workings TUNNEL
    Length 91.44M

Comments on the workings information

  • LOWER TUNNEL AT 250 FT ELEV HAS 225 FEET OF WORKINGS. TWO OTHER TUNNELS, AT 250 FEET ELEV AND 500 FEET ELEV HAVE 30 FEET OF WORKINGS EACH. ALSO SOME SURFACE TRENCHING

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010416

Bibliographic references

  • Deposit

    USGS BULLETIN 692, P. 146-147

  • Deposit

    USGS BULLETIN 963-B, P. 75-76

  • Deposit

    USGS MISCELLANEOUS FIELD STUDIES 880-A, LOCATION 189

  • Deposit

    USGS OPEN FILE 80-621, P. 118

General comments

Subject category Comment text
Deposit SEVERAL SHOWINGS OF WHAT APPEARS TO BE THE SAME SHEAR ZONE IN A PRONOUNCED GULLY. THE ZONE CONSISTS OF SHATTERED GREENSTONE RECEMENTED BY QUARTZ AND SULFIDES. THE ZONE AVERAGES 4 FEET IN WIDTH, THOUGH THE MINERALIZED PORTION AVERAGES 5 TO 12 INCHES. ONE BODY OF SOLID CUPIFEROUS PYRITE IS 10 FEET WIDE AND A STREAK OF SOLID CHALCOPYRITE ALONG THE HANGING WALL IS 3 INCHES THICK.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1984 Hirschmann, M. M. (Elliott, R. L.) U.S. Geological Survey
Editor 30-MAY-1995 Waller, Nichelle (Mosier, Dan) U.S. Geological Survey PARSED DATA INTO ORE BODY MULTIVALUED FIELDS
Editor 30-MAY-1995 Waller, Nichelle (Mosier, Dan) U.S. Geological Survey PARSED DATA INTO WORKINGS MULTIVALUED FIELDS