Last Chance Mine

Occurrence in Skamania county in Washington, United States with commodities Copper, Vanadium, Gold, Silver, 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. Ore body information
  13. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Ownership information
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10047849
MRDS ID M700177
Record type Site
Current site name Last Chance Mine
Related records 10155988

Geographic coordinates

Geographic coordinates: -122.21451, 45.71009 (WGS84)
Elevation 488
Relative position 16 MI FROM WASHOUGAL BY ROAD; ABOUT 5 MI NORTH-NORTHWEST OF BOBS MOUNTAIN

Site location context

Political divisions (FIPS codes)

Skamania(county)

Washington(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Bobs Mountain(quadrangle 1:24,000 scale)

Vancouver(quadrangle 1:100,000 scale)

Vancouver(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Columbia-Sandy(hydrologic unit)

Lower Columbia(hydrologic accounting unit)

Lower Columbia(hydrologic subregion)

Pacific Northwest(hydrologic region)

Geographic areas

Country State County
United States Washington Skamania

Public Land Survey System information

Meridian Township Range Section Fraction State
Willamette 003N 005E 29 CENTER OF S2 OF SE4 Washington

Comments on the location information

  • LAST CHANCE IS APPARENTLY THE MINE LABELED "SKAMANIA" ON THE TOPO MAP. ON WEST FORK WASHOUGAL RIVER. ON DEEDED LAND

Commodities

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

Materials information

Materials Type of material
Bornite Ore
Chalcocite Ore
Chrysocolla Ore
Descloizite Ore
Malachite Ore
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) Locally Extensive Silicification And Argillization In Vein But Wall Rocks Only Weakly Propylitized

Analytical data

Result CU=TR-6%, OVER VEIN WIDTH OF 1-5 FT. 8-10% CU REPORTED OVER VEIN WIDTH UP TO 1 FT IN EAST ADIT. VEIN AS A WHOLE ESTIMATED TO CARRY 1.5% CU OVER WIDTH OF 1-3 FT. USBM SAMPLES SHOWED 2.75% CU, 0.71 OZ/TON AG IN EAST ADIT (936 FT) OVER AVERAGE VEIN WIDTH OF 4 FT. COMPOSITE SAMPLES SHOW 1-2% V2O5, AND 0.25-0.50% V2O5. OTHER ASSAYS AVERAGE 0.13 OZ/TON AU, 7.2 OZ/TON AG, 7.5% CU. SPECTOGRAPHIC ANALYSIS OF DESCLOIZITE AT FACE OF ADIT SHOWED 1-10% V, 1-10% PB, 8% CU, 8% ZN. SEE MOEN (1977) FOR MORE ASSAYS

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 > Mafic Intrusive Rock > Diorite
    Rock unit name Silver Star Pluton
    Rock description Silver Star Pluton
    Stratigraphic age (youngest) Oligocene
    Stratigraphic age (youngest) Miocene
    Stratigraphic age (youngest) Miocene

Nearby scientific data

(1) -122.21451, 45.71009

Economic information

Ore body information

  • General form VEIN
    Strike S45-54E
    Dip 60-90SW AND NE
    Thickness 3.05M
    Length 3218.6M
    Width 243.84M
    Depth to top 0M

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1900

Mining district

District name Washougal District

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Washougal Consolidated Copper Mining Co.
  • Type Owner
    Owner Leon Montchalin, Washougal, Wash.
    First year 1956

Workings at the site

  • Type of workings Underground
    Length 366.67M
    Overall depth 164.59M

Comments on the workings information

  • 936 FT EAST ADIT, 267 FT WEST ADIT, 540 FT VERTICAL SHAFT WITH 5 LEVELS OF DRIFTS RANGING FROM 30-209 FT LONG, 9 CROSSCUTS 10-40 FT LONG

Comments on development

  • ALTHOUGH CONSIDERABLE DEVELOPEMNT WORK WAS UNDERTAKEN IN THE EARLY 1900'S, NO SHIPMENTS OF ORE WERE MADE. MINE IDLE IN 1977

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit QUARTZ-FILLED FISSURE VEIN IN QUARTZ DIORITE PHASE OF SILVER STAR PLUTON. VEIN IS 1-10 FT THICK, MUCH OF WHICH CONSISTS OF 1-4 FT OF MASSIVE QUARTZ. THICKER PARTS OF VEIN CONSIST OF SEVERAL NARROW QUARTZ VEINS ALTERNATING WITH HIGHLY BRECCIATED AND SILICIFIED QUARTZ DIORITE. BORNITE, CHALCOCITE, AND CHALOCPYRITE OCCUR AS DISSEMINATIONS AND BLEBS IN THE VEIN QUARTZ; CHRYSOCOLLA, MALACHITE, AND AZURITE COAT FRACTURE SURFACES. IN A FEW PLACES, CHRYSOLCOLLA FORMS 1-6 IN. THICK VEINS. DESCLOIZITE (LEAD VANADATE) LOCALLY FORMS THIN GREENISH-YELLOW COATINGS ON VEIN SURFACES.
Deposit MAPS OF MINE WORKINGS AND LOCATION MAP AVAILABLE IN MOEN (1977) ; INFO.SRC : 1 PUB LIT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-1981 Caress, Mary E. (Evarts, Russ) U.S. Geological Survey
Updater 01-NOV-1992 Peterson, Jocelyn A. U.S. Geological Survey

Beyond USGS

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

External references