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Johnson Prospect

Occurrence in Alaska, United States with commodity Gold
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Geologic information

Identification information

Deposit ID 10001360
MRDS ID A012100
Record type Site
Current site name Johnson Prospect
Alternate or previous names Gold King
Related records 10258290

Geographic coordinates

Geographic coordinates: -135.06873, 58.86475 (WGS84)
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Geographic areas

Country State
United States Alaska

Comments on the location information

  • LOCATION OBTAINED FROM UNPUBLISHED MINES AND PROSPECTS MAP. LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Commodities

Commodity Importance
Gold Primary

Comments on the commodity information

  • PYRITE IS THE ONLY SULFIDE MENTIONED

Materials information

Materials Type of material
Pyrite Gangue
Quartz Gangue

Analytical data

Result AVERAGE 0.189 OZ AU/TON, METZ AND WIEBMER, 1977 UNPUB. REPORT

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Jualin Diorite;
    Rock description Jualin Diorite;

Nearby scientific data

(1) -135.06873, 58.86475
ListMap

Ore body information

  • Strike N 15 W
    Dip E, STEEP
    Width 21.34M
    Length 457.2M

Comments on the geologic information

  • DEPOSIT IS ALONG CONTACT OF JUALIN DIORITE WITH AMYGDALOIDAL METABASALTS THAT ARE CONTEMPORANEOUS WITH CRETACEOUS TO JURASSIC BERNERS FORMATION; SEE: JUALIN MINE

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Juneau/Berner'S Bay

Land status

Ownership category National Forest

Reserves and resources

  • Type In-situ
    Estimate year 1977
    Total resources 6,299,275,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 6.98 g/mt Gold Major 1977

Comments on the reserve resource information

  • METZ AND WIEBMER, 1977 UNPUB. REPORT

Workings at the site

  • Type of workings Surface/Underground
    Length 487.68M

Comments on the workings information

  • JOHNSON ORE BODY WAS INTERSECTED BY KENSINGTON ADIT 4800 FT FROM PORTAL; EXPLORED BY 1600 FT OF DRIFTS AND CROSSCUTS BEFORE 1915

Comments on development

  • EXPLORED IN EARLY 1900'S; INTERSECTED BY KENSINGTON ADIT IN 1913 AND EXPLORED UNDERGROUND

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012100

Bibliographic references

  • Deposit

    USGS BULL 287, P. 137

  • Deposit

    USGS BULL 284, P. 33

  • Deposit

    USGS BULL 446, P. 43-44

  • Deposit

    USGS BULL 592, P. 59

  • Deposit

    METZ, PAUL A. AND WIEBMER, JOHN D., 1977, MINERAL INDUSTRY RESEARCH LABORATORY SUMMARY FILE REPORT EUREKA, KENSINGTON, COMET, JOHNSON AND JUALIN MINES, BERNER'S BAY, JUNEAU DISTRICT, ALASKA: UNPUBLISHED REPORT SUBMITTED TO USBM ALASKA FIELD OPERATIONS CENTER, JUNEAU, AK

  • Deposit

    USGS BULL 642, P. 77-78

  • Deposit

    USGS OFR 85-717, NO. J094

  • Other Database

    BAG-OFR-85-717-094

General comments

Subject category Comment text
Deposit STOCKWORK OF PYRITIC QUARTZ STRINGERS IN SHEAR ZONE ALONG CONTACT BETWEEN DIORITE AND METABASALT; SURFACE SAMPLING DONE IN EARLY 1900'S INDICATED AN ORE BODY 1500 FT LONG, 50 TO 70 FT WIDE CARRYING AVERAGE VALUE OF ABOUT 0.189 OZ AU/TON; CLOSE TO WIDE SPACED QUARTZ STRINGERS WITH ABUNDANT PYRITE GRADING INTO WIDELY SPACED VEINS; VERTICAL EXTENT PROBABLY AT LEAST 400-800 FT
Deposit SEE ALSO: KENSINGTON, COMET, JUALIN ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-1985 Leonard, Kenneth R. (Elliott, R. L.) U.S. Geological Survey
Editor 14-APR-1994 Mosier, Dan U.S. Geological Survey