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Jacobson

Past Producer in Alaska, United States with commodities Arsenic, Copper, Gold, Lead, Silver, Zinc
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Geologic information

Identification information

Deposit ID 10282734
MRDS ID A000648
MAS/MILS ID 0020960073
Record type Site
Current site name Jacobson
Alternate or previous names Threeman Mining Company, Alaska Commercial Co.

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -146.54474, 60.85429 (WGS84)
Elevation 61
Location accuracy 100(meters)
(click for info)

Geographic areas

Country State
United States Alaska

Public Land Survey System information

Meridian Township Range Section Fraction State
Copper River 012 S 007 W 06 SWNESW Alaska

Commodities

Commodity Importance
Arsenic Tertiary
Copper Primary
Gold Tertiary
Lead Tertiary
Silver Tertiary
Zinc Tertiary

Materials information

Materials Type of material
Arsenopyrite Unknown
Chalcopyrite Unknown
Galena Unknown
Pyrrhotite Unknown
Sphalerite Unknown

Nearby scientific data

Ore Body (1) -146.54474, 60.85429
ListMap

Ore body information

  • Strike N70E
    Dip 70N
    Width 1M
    Length 30M
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 SHEAR ZONE
    Shape of Orebody #1 LENTICULAR
    Type of Orebody #2 REPLACEMENT
    Shape of Orebody #2 TABULAR
    Type of Orebody #3 DISSEMINATED
    Primary mode of Origin HYDROTHERMAL
    Primary Ore Control FAULTING
    Secondary Ore Control FOLDING
    Degree of Wallrock Alter. UNKNOWN
    Type of Wallrock Alter. #1 UNKNOWN
    Strike And Dip N70E
    Date of Last Modification 881017

Comments on the geologic information

  • COUNTRY ROCK GREENSTONE WITH SLATES AND GREYWACKE. GREENSTONE WITH CHALCOPYRITE,PYRRHOTITE,SPHALERITE,GALENA, AND ARSENOPYRITE. Workings consist of an adit at the 61 m. elev. which contains a 91.4 m. crosscut and 61 m. of drifts. Also two adits at the 137.2 m. elev.; one contains 6.1 m. of working ant the other conatains 30.1 m. of workings. MS 1485

Economic information

Economic information about the deposit and operations

Operation type Underground
Development status Past Producer
Commodity type Metallic
Significant No

Mineral rights holdings

Type of mineral rights Patented
Type of mineral rights Located Claim

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner Thurstonson And Jacobson
    Interest 100
    Home office Alaska
    Year 1978
  • Type Owner
    Owner Threeman Mining Co.
    Interest 100
    Home office Alaska
    Year 1905

Reserves and resources

  • Type In-situ
    Estimate year 1984
    Inferred 992mt ore
    Total resources 992mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 1.1199 wt-pct Copper Major 1984
    Zinc Zn 0.5 wt-pct Zinc Trace 1984
    Gold Au 677.6 g/mt Gold Trace 1984

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
U.S. Bureau of Mines Minerals Availability System MAS 0020960073
USGS Mineral Resources Data System MRDS A000648 MAS references MRDS

Bibliographic references

  • Ownership

    ALASKA KARDEX 096-023

  • Deposit

    B284i pp. 83-84

  • Deposit

    B542g pp. 119-121

  • Deposit

    B592k p. 241

  • Deposit

    B605 pp. 13, 52-56, 70-71, 107-108

  • Deposit

    B622i p. 133

  • Deposit

    BMB142 p. 43

  • Deposit

    BMB153 p. 50

  • Deposit

    RI5320 pp. 2, 6, 18-19

  • Deposit

    I453

  • Deposit

    MF392

  • Deposit

    B1246 pp. 66, 69

  • Deposit

    OF79-973 75 pp.

  • Deposit

    MR32

  • Deposit

    OF82-1029 33 pp.

  • Deposit

    B1139 363 pp.

  • Deposit

    B773e pp. 141-158

  • Deposit

    AR20e pp. 341-424

  • Deposit

    BMOF69-73

  • Deposit

    MLA5-84 218 pp., (Locality C-75)

Reporter information

Type Date Name Affiliation Comment
Reporter 17-OCT-1988 Wlg U.S. Bureau of Mines