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Last Hope Group

Occurrence in Skamania county in Washington, United States with commodities Copper, Silver, Gold, Lead
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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. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Controls for ore emplacement
  12. Economic information about the deposit and operations
  13. Mining district
  14. Mineral rights holdings
  15. Land status
  16. Workings at the site
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10095762
MRDS ID M700178
MAS/MILS ID 0530590059
Record type Site
Current site name Last Hope Group

Geographic coordinates

Geographic coordinates: -122.11675, 46.35759 (WGS84)
Elevation 1036
Location accuracy 100(meters)
Relative position 5.5 MI NORTH OF SPIRIT LAKE, ABOUT 1.75 MI NORTH-NORTHWEST OF TWIN LAKES

Site location context

Political divisions (FIPS codes)

Skamania(county)

Washington(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Spirit Lake East(quadrangle 1:24,000 scale)

Mount Saint Helens and Vicinity(quadrangle 1:100,000 scale)

Hoquiam(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Cowlitz(hydrologic unit)

Lower Columbia(hydrologic accounting unit)

Lower Columbia(hydrologic subregion)

Pacific Northwest(hydrologic region)

Federal lands

Gifford Pinchot 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 Skamania

Public Land Survey System information

Meridian Township Range Section Fraction State
Willamette 010N}010N 005E}006E 12}07 SE4 (12) OF SW4 (07) Washington

Comments on the location information

  • ON SOUTH SLOPE OF GOAT MOUNTAIN BETWEEN MINNIE LEE AND POLAR STAR CLAIMS. NEAR NORTH EDGE OF BLAST ZONE FROM 1980 MOUNT ST. HELENS ERUPTION
  • Different PLSS described in Moen (1977), but he couldn't find the property. Location here probably supplied by USGS field exam and is considered the best location.

Commodities

Commodity Importance
Copper Primary
Silver Primary
Gold Secondary
Lead Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Gold Ore
Pyrite Ore
Quartz Gangue
Talc Gangue

Analytical data

Result ASSAYS OF 15 SAMPLES SHOWED TR-11.22% CU, 0-0.06 OZ/TON AU, AND 0-7 OZ/TON AG, WITH AN AVERAGE OF 1.705% CU, 2.36 OZ/TON AG, AND 0.02 OZ/TON AU.

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Spirit Lake Pluton, Main Phase
    Rock description Spirit Lake Pluton, Main Phase
    Stratigraphic age (youngest) Miocene
    Stratigraphic age (youngest) Miocene

Nearby scientific data

(1) -122.11675, 46.35759
ListMap

Economic information

Ore body information

  • General form BRECCIA MATRIX
    Thickness 0.76M

Controls for ore emplacement

  • Brecciation

Comments on the geologic information

  • DEPOSIT HAS BEEN DESCRIBED IN THE LITERATURE AS A VEIN DEPOSIT, BUT FIELD CHARACTERISTICS OF MATERIAL ON THE DUMP AND THE PRESENCE OF A BRECCIA EXPOSED ABOVE THE WORKINGS SUGGEST THAT THE DEPOSIT IS MORE LIKELY RELATED TO A BRECCIA

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name St. Helens District - Ryan Lake Area

Mineral rights holdings

Type of mineral rights Located Claim

Land status

Ownership category National Forest
Area name In Gifford-Pinchot Natinal Forest
Ownership category National Monument
Area name Mt. St. Helens National Monument

Comments on the reserve resource information

  • 2,000 TONS OF ORE WAS REPORTED TO BE STOCKPILED AT THE PORTAL OF THE UPPER ADIT IN 1905

Workings at the site

  • Type of workings Underground
    Name of workings Upper Portal
    Length 33.22M
  • Type of workings Underground
    Name of workings Lower adit
    Length 79.85M

Comments on the workings information

  • 2 ADITS. 79 FT UPPER ADIT WAS DRIVEN NORTH; AND 40 FT FROM PORTAL A DRIFT RUNS NORTHEAST FOR 30 FT. ABOUT 300 FT BELOW UPPER ADIT, LOWER ADIT WAS DRIVEN DUE NORTH 262 FT; LAST 12 FT OF ADIT EXPOSED QUARTZ CONTAINING ABUNDANT PYRITE AND CHALCOPYRITE

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit DEPOSIT HAS BEEN GIVEN THE INFORMAL NAME OF A BRECCIA PIPE CU DEPOSIT, FOR WHICH THERE IS NO PUBLISHED MODEL. PYRITE AND CHALCOPYRITE OCCUR IN BRECCIATED AREA IN FINE-GRAINED GRANODIORITE. IN ADDITION TO CHALCOPYRITE BRECCIA MINERALIZATION, A 2-12 IN. QUARTZ VEIN CONTAINING GALENA IS PRESENT. QUARTZ VEIN NOT SEEN IN 1991
Deposit LOCATION MAP AVAILABLE IN MOEN, (1977) P. 17

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-81 Caress, Mary E. (Evarts, Russ) U.S. Geological Survey
Updater 01-SEP-91 Peterson, Jocelyn A. U.S. Geological Survey
Reporter 24-JUN-94 Ridenour, James U.S. Bureau of Mines
Updater 08-JUN-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