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Twins Group

Occurrence in Skagit county in Washington, United States with commodities Chromium, Iron
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Geologic information

Identification information

Deposit ID 10252767
MAS/MILS ID 0530570013
Record type Site
Current site name Twins Group
Alternate or previous names Twins No.1, Pedro, Deer, Cougar, Twins No.2, Sandy, Mona, Floats, Grover, Bear, Antelope

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -121.90264, 48.62671 (WGS84)
Elevation 900
Location accuracy 100(meters)
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Geographic areas

Country State County
United States Washington Skagit

Public Land Survey System information

Meridian Township Range Section Fraction State
Willamette 036 N 007 E 09 NE Washington

Commodities

Commodity Importance
Chromium Tertiary
Iron Tertiary

Materials information

Materials Type of material
Chromite Unknown
Enstatite Unknown
Magnetite Unknown
Olivine Unknown
Serpentine Unknown

Nearby scientific data

Ore Body (1) -121.90264, 48.62671
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Ore body information

  • Thickness 9999M
    Depth to top 99999M
    Width 999999M
    Length 999999M
    Area 92HA
    Field Value
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 LENTICULAR
    Type of Orebody #2 OTHER
    Shape of Orebody #2 OTHER
    Primary mode of Origin MAGMATIC DIFFER
    Primary Ore Control IGNEOUS
    Secondary Ore Control FRACTURING
    Degree of Wallrock Alter. NONE
    Type of Wallrock Alter. #1 UNKNOWN
    Minimum Depth to Top 99999
    Avg. Thick. Unconsol. Mat. 9999
    Min. Thick. Unconsol. Mat. 9999
    Total Surface Area (HA) 92
    Date of Last Modification 830324

Economic information

Economic information about the deposit and operations

Operation type Surface
Development status Occurrence
Commodity type Metallic
Significant No
Discovery year 1940

Mining district

District name Sisters

Mineral rights holdings

Type of mineral rights Located Claim
Type of mineral rights Unknown

Land status

Ownership category National Forest

Ownership information

  • Type Unknown
    Owner Geo Peterson
    Home office Washington
    Year 1975

Comments on the production information

  • PRODUCTION IS ONGOING.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
U.S. Bureau of Mines Minerals Availability System MAS 0530570013

Bibliographic references

  • Deposit

    GAUDETTE, H.E., GEOCHEMISTRY OF THE TWIN SISTERS

  • Deposit

    ULTRAMAFIC BODY, WASHINGTON, UNPUB. THESIS, UNIV. OF

  • Deposit

    ILLINOIS, 1953.

  • Deposit

    WASH, DIV. OF MINES AND GEOL. BULL. 37, 1956.

  • Deposit

    CHROMITE DEPOSITS OF TWIN SISTERS MTS., WASHINGTON.

  • Deposit

    SHINE MING CO CONFIDENTIAL RPT 1942 FILES USBM WFOC

Reporter information

Type Date Name Affiliation Comment
Reporter 27-FEB-84 Lucas, J.M. U.S. Bureau of Mines