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  3. Mineral Resource Data System (MRDS)

Potomac

Occurrence in Snohomish county in Washington, United States with commodities Gold, Silver, Copper, Lead, Zinc, Arsenic
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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. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Land status
  17. Reserves and resources
  18. Workings at the site
  19. Links to other databases
  20. Bibliographic references
  21. General comments
  22. Reporter information

Geologic information

Identification information

Deposit ID 10048573
MRDS ID MP00171
Record type Site
Current site name Potomac

Geographic coordinates

Geographic coordinates: -121.36593, 47.98232 (WGS84)
Elevation 1372
Relative position ABOUT 1.5 MI EAST OF MONTE CRISTO; ABOUT 3 MI NORTH-NORTHWEST OF BLANCA LAKE

Site location context

Political divisions (FIPS codes)

Snohomish(county)

Washington(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Blanca Lake(quadrangle 1:24,000 scale)

Skykomish River(quadrangle 1:100,000 scale)

Wenatchee(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Sauk(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)

Henry M. Jackson Wilderness(Wilderness)

Wilderness 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 011E 26 NEAR N EDGE OF NW4 Washington

Comments on the location information

  • UNSURVEYED

Commodities

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

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Sphalerite Ore
Quartz Gangue

Alteration

  • (Local) Tonalite Is Bleached

Analytical data

Result A FEW SAMPLES ASSAYED. MAXIMUM VALUES ARE 0.082 OZ/TON AU, 13.2 OZ.TON AG, 8.9% CU, 2.66% PB, 7.8% ZN, 1.3% AS

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Tonalite
    Rock unit name Grotto Batholith
    Rock description Grotto Batholith
    Stratigraphic age (youngest) Miocene
    Stratigraphic age (youngest) Miocene

Nearby scientific data

(1) -121.36593, 47.98232
ListMap

Economic information

Ore body information

  • General form VEIN
    Strike N78E
    Dip 68NW
    Thickness 0.37M
    Length 9.14M

Controls for ore emplacement

  • Shearing

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Monte Cristo District

Land status

Ownership category National Forest
Area name In Mount Baker National Forest

Reserves and resources

  • Type In-situ
    Estimate year 1983
    Total resources 90000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 0.988 g/mt Gold Major 1983
    Silver Ag 155.296 g/mt Silver Major 1983
    Copper Cu 2.05 wt-pct Copper Major 1983
    Lead Pb 0.94 wt-pct Lead Major 1983
    Zinc Zn 1.85 wt-pct Zinc Major 1983
    Arsenic As 0.7 wt-pct Arsenic Trace 1983

Comments on the reserve resource information

  • IF THIS IS AN EXTENSION OF THE VEIN ON THE WASHINGTON PROSPECT, 100,000 TONS OF RESOURCES COULD BE INFERRED

Workings at the site

  • Type of workings Surface/Underground
    Length 9.75M

Comments on the workings information

  • ADIT, TRENCH

Reference information

Bibliographic references

  • 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. 27

  • Reserve-Resource

    JOHNSON AND OTHERS

General comments

Subject category Comment text
Deposit SULFIDE-BEARING QUARTZ VEIN

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1992 Peterson, Jocelyn A. 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