Seacrest

Occurrence in Snohomish county in Washington, United States with commodities Copper, Molybdenum, Nickel, Chromium, Lead, Zinc
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. Mining district
  17. Land status
  18. Ownership information
  19. Reserves and resources
  20. Links to other databases
  21. Bibliographic references
  22. General comments
  23. Reporter information

Geologic information

Identification information

Deposit ID 10048446
MRDS ID MP00033
Record type Site
Current site name Seacrest
Alternate or previous names Silver Creek, New York

Geographic coordinates

Geographic coordinates: -121.41593, 47.95288 (WGS84)
Elevation 1219
Relative position ABOUT 2 MI SOUTH-SOUTHWEST OF MONTE CRISTO

Site location context

Political divisions (FIPS codes)

Snohomish(county)

Washington(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Monte Cristo(quadrangle 1:24,000 scale)

Skykomish River(quadrangle 1:100,000 scale)

Wenatchee(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Skykomish(hydrologic unit)

Puget Sound(hydrologic accounting unit)

Puget Sound(hydrologic subregion)

Pacific Northwest(hydrologic region)

Federal lands

Mt. Baker-Snoqualmie National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Washington Snohomish

Public Land Survey System information

Meridian Township Range Section Fraction State
Willamette 029N}028N 011E}011E 31,32,33}04,05,06,07,08,09 Washington

Commodities

Commodity Importance
Copper Primary
Molybdenum Primary
Nickel Critical Secondary
Chromium Critical Secondary
Lead Tertiary
Zinc Critical Tertiary

Materials information

Materials Type of material
Chalcopyrite Ore
Molybdenite Ore
Pyrite Ore

Alteration

  • (Local) Ubiquitous Hydrothermal Alteration, Propylitic, Weak Potassic

Analytical data

Result ANALYSES OF NUMEROUS SAMPLES YIELDED MAXIMUMS OF 11.6% CU, 0.374% NI, 0.63% CR

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 > Ultramafic Intrusive Rock
    Rock unit name Eastern Melange Belt
    Rock description Eastern Melange Belt
    Stratigraphic age (youngest) Holocene
    Stratigraphic age (youngest) Holocene
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Tonalite
    Rock unit name Tonalite Of Silver Creek;
    Rock description Tonalite Of Silver Creek;

Nearby scientific data

(1) -121.41593, 47.95288

Economic information

Geologic structures

Type of structure Local
Structure description Transverse Fractures

Ore body information

  • General form PERVASIVE FRACTURE FILLING, RARELY DISSEMINATED
    Dip }
  • General form PERVASIVE FRACTURE FILLING, RARELY DISSEMINATED
    Dip }

Controls for ore emplacement

  • Fracturing

Comments on the geologic information

  • GEOLOGIC MAP INDICATES BRECCIA IS INTRUSIVE RATHER THAN VOLCANIC

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Silver Creek District

Land status

Ownership category National Forest
Area name In Snoqualmie National Forest

Ownership information

  • Type Operator
    Owner Duval, Cities Service
    First year 1976

Reserves and resources

  • Type In-situ
    Estimate year 1983
    Total resources 2000mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 0.2 wt-pct Copper Major 1983
    Nickel Ni 0.24 wt-pct Nickel Minor 1983
    Chromium Cr2O3 0.34 wt-pct Chromium Minor 1983

Comments on the reserve resource information

  • INFERRED, SUBECONOMIC RESOURCES. LOCALIZED OCCURRENCES OF 0.5% CU ARE PRESENT IN ALTERED INTRUSIVE ROCKS

Comments on the workings information

  • DRILL CORES

Comments on development

  • DEPOSIT MAY BE AMENABLE TO HEAP LEACHING

Reference information

Bibliographic references

  • Deposit

    CHURCH, S.E., TABOR, R.W., AND JOHNSON, F.L., 1983, MINERAL RESOURCE POTENTIAL OF THE GLACIER PEAK ROADLESS AREA, SNOHOMISH COUNTY, WASHINGTON: U.S. GEOLOGICAL SURVEY MISCELLANEOUS FIELD STUDIES MAP MF-1380-C, SCALE 1:50,000.

  • Deposit

    JOHNSON, F.L., DENTON, D.K., IVERSON, S.R., MCCULLOCH, R.B., STEBBINS, S.A., AND STOTELMEYER, R.B., 1983, MINERAL RESOURCES OF THE GLACIER PEAK RARE II AREA (NO. L6031), SNOHOMISH COUNTY, WASHINGTON: U.S. BUREAU OF MINES OPEN-FILE REPORT MLA 75-83, P. 8, 18-19, 36.

  • Deposit

    GRANT, A.R., 1976, REPORT OF EVALUATION, MINERAL RESOURCE ANALYSIS STUDY ON UNITED STATES FOREST SERVICE LAND, STATE OF WASHINGTON: PREPARED FOR U.S. FOREST SERVICE - REGION 6, CONTRACT NO. 004724N, P. 37.

  • Deposit

    TABOR, R.W., FRIZZELL, V.A., JR., BOOTH, D.B., WHETTEN, J.T., WAITT, R.B., JR., AND ZARTMAN, R.E., 1982, PRELIMINARY GEOLOGIC MAP OF THE SKYKOMISH RIVER 1:100,000 QUADRANGLE, WASHINGTON: U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 82-747, SCALE 1:100,000.

  • Deposit

    HOLLISTER, V.F., 1979, PORPHYRY COPPER-TYPE DEPOSITS OF THE CASCADE VOLCANIC ARC, WASHINGTON: MINERALS SCIENCE AND ENGINEERING, V. 11, P. 22-35.

  • Reserve-Resource

    JOHNSON AND OTHERS

General comments

Subject category Comment text
Deposit PORPHYRY COPPER DEPOSIT IS ZONED WITH A CRUDE CU-MO CORE AND A PB-ZN PERIPHERY. DRILL CORES INTERSECTED ULTRAMAFIC ROCKS CONTAINING NI AND CU. THE PORPHYRY COPPER APPARENTLY WAS OVERPRINTED ON THE TERRANE CONTAINING THE ULTRAMAFIC DEPOSITS. STRIKE GIVEN IS TREND OF ULTRAMAFIC ROCKS
Deposit SEE ALSO MRDS RECORD MP00186

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1991 Peterson, Jocelyn A. U.S. Geological Survey

Beyond USGS

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