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Twin Sisters Mtns

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

Identification information

Deposit ID 10047974
MRDS ID M700347
Record type Site
Current site name Twin Sisters Mtns
Related records 10229059

Geographic coordinates

Geographic coordinates: -121.89957, 48.63981 (WGS84)
Elevation 1219
Location accuracy 500(meters)
Relative position 4.6 MILES WEST OF DOCK BUTTE.
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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 036N 007E 03,04 Washington

Comments on the location information

  • TWIN SISTERS MTNS (SE END), THREE LAKES AREA; ELEVATION IS APPROXIMATE.

Commodities

Commodity Importance
Chromium Primary

Materials information

Materials Type of material
Chromite Ore
Dunite Gangue
Olivine Gangue

Mineral occurrence model information

Model code 15
USGS model code 8a
Deposit model name Podiform chromite (minor)
Mark3 model number none

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite

Nearby scientific data

(1) -121.89957, 48.63981
ListMap

Ore body information

  • General form PODS, BANDS, MASSIVE, DISSEMINATED

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No
Discovery method Ore-Mineral In Place

Mining district

District name Hamilton District

Land status

Ownership category National Forest

Ownership information

  • Type Owner
    Owner Twin Sisters Magnesium And Chrome Corp., Seattle, Wash.
    First year 1955

Comments on the workings information

  • WORKINGS UNKNOWN

Comments on development

  • UNKNOWN DEVELOPMENT

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS M700347

Bibliographic references

  • Deposit

    HUNTTING, M.T., 1956, INVENTORY OF WASHINGTON MINERALS, PART II, METALLIC MINERALS: WASHINGTON DIVISION OF MINES AND GEOLOGY BULLETIN 37, V. 1, P. 40.

  • Deposit

    WASHINGTON DIVISION OF MINES AND GEOLOGY INFORMATION CIRCULAR 24, P. 16

  • Deposit

    WASHINGTON DIVISION OF MINES AND GEOLOGY INFORMATION CIRCULAR 27, P. 18.

General comments

Subject category Comment text
Deposit DEVELOPMENT IN 1955, 1957. ; INFO.SRC : 1 PUB LIT
Deposit MRDS RECORD US53003 HAS BEEN MERGED WITH THIS RECORD AND DELETED
Deposit CHROMITE APPEARS AS SMALL PODS, BANDS, AND DISSEMINATED GRAINS IN DUNITE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1982 Lawson, William A. (Evarts, Russell C.) U.S. Geological Survey
Editor 07-JUN-1995 Peterson, Jocelyn A. U.S. Geological Survey