1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

North Fork

Prospect in King county in Washington, United States with commodity Copper
Map
XML
JSON
KML
B
Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  9. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Ore body information
  14. Controls for ore emplacement
  15. Economic information about the deposit and operations
  16. Mineral rights holdings
  17. Land status
  18. Ownership information
  19. Reserves and resources
  20. Links to other databases
  21. Bibliographic references
  22. Reporter information

Geologic information

Identification information

Deposit ID 10048440
MRDS ID MP00027
MAS/MILS ID 0530330991
Record type Deposit
Current site name North Fork
Alternate or previous names Weyerhaeuser Land Prospect

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -121.662, 47.689 (WGS84)
Elevation 1067
Location accuracy 100(meters)
Relative position ABOUT 1 MI SOUTH OF SOUTH FORK TOLT RESERVOIR, Doug Causey did exploration work on this deposit for Cities Service Minerals in 1975. Location accurate.

Site location context

Political divisions (FIPS codes)

King(county)

Washington(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Devils Slide(quadrangle 1:24,000 scale)

Skykomish River(quadrangle 1:100,000 scale)

Wenatchee(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Snoqualmie(hydrologic unit)

Puget Sound(hydrologic accounting unit)

Puget Sound(hydrologic subregion)

Pacific Northwest(hydrologic region)

Geographic areas

Country State County
United States Washington King

Public Land Survey System information

Meridian Township Range Section Fraction State
Willamette 025N 009E 02,03,04,11 Washington
Willamette 026N 009E 33,34,35 Washington

Comments on the location information

  • PARTLY WITHIN SOUTH FORK TOLT WATERSHED

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Bornite Ore
Chalcopyrite Ore
Pyrite Ore
Pyrrhotite Ore
Magnetite Gangue

Alteration

  • (Local) Potassic
  • (Local) Argillic
  • (Local) Propylitic

Mineral occurrence model information

Model code 53
USGS model code 17
Deposit model name Porphyry Cu
Mark3 model number 4

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Snoqualmie Batholith
    Rock description Snoqualmie Batholith;Snoqualmie Batholith
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Dacite
    Rock unit name Volcanic Rocks Of Mount Persis
    Rock description Snoqualmie Batholith;Volcanic Rocks Of Mount Persis

Nearby scientific data

Ore Body (1) Eocene volcanic rocks
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Fractures

Ore body information

  • General form STOCKWORK

Controls for ore emplacement

  • Fractures

Comments on the geologic information

  • SAID TO BE SIMILAR TO THE NORTH FORK DEPOSIT. INTRUSIVE ROCKS OF HOLLISTER ARE MAPPED AS ROCKS OF SNOQUALMIE BATHOLITH BY TABOR AND OTHERS. VOLCANIC ROCKS ARE CALLED VOLCANIC ROCKS OF MOUNT PERSIS BY TABOR AND OTHERS. VOLCANIC ROCKS ARE UNDERLAIN BY ROCKS OF THE WESTERN MELANGE BELT

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic
Deposit size Small
Significant No

Mineral rights holdings

Type of mineral rights Patented

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner Weyerhaeuser Co.
    Interest 100
    Home office Washington
    Year 1974

Reserves and resources

  • Type In-situ
    Estimate year 1979
    Total resources 44000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 0.5 wt-pct Copper Major 1979

Comments on the workings information

  • 26 DRILL HOLES

Comments on development

  • DEPOSIT HAS BEEN DRILLED ONLY

Reference information

Bibliographic references

  • Deposit

    HOLLISTER, V.F., 1979, PORPHYRY COPPER-TYPE DEPOSITS OF THE CASCADE VOLCANIC ARC, WASHINGTON: MINERALS SCIENCE AND ENGINEERING, V. 11, P. 32-33.

  • Deposit

    Washington Division of Mines and Geology IC 48, 1973, P. 19.

  • Geology

    TABOR, R.W., FRIZZELL, V.A., JR., BOOTH, D.B., WAITT, R.B., JR., WHETTEN, J.T., AND ZARTMAN, R.E., 1993, GEOLOGIC MAP OF THE SKYKOMISH RIVER 30- by 60-MINUTE QUADRANGLE, WASHINGTON: U.S. GEOLOGICAL SURVEY MISCELLANEOUS INVESTIGATION SERIES MAP I-1963, SCALE 1:100,000.

  • Reserve-Resource

    HOLLISTER

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-93 Peterson, Jocelyn A. U.S. Geological Survey
Reporter 18-MAY-09 Causey, J. Douglas U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site