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Muscovite Mine

Past Producer in Latah county in Idaho, United States with commodities Beryllium, Mica, Uranium
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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. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Mineral rights holdings
  17. Land status
  18. Ownership information
  19. Production statistics
  20. Reserves and resources
  21. Workings at the site
  22. Links to other databases
  23. Bibliographic references
  24. Reporter information

Geologic information

Identification information

Deposit ID 10290309
MRDS ID M060826
MAS/MILS ID 0160570028
Record type Site
Current site name Muscovite Mine

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -116.57933, 46.88956 (WGS84)
Elevation 1274
Location accuracy 10(meters)
Relative position 6 MILES N. OF DEARY, IDAHO

Site location context

Political divisions (FIPS codes)

Latah(county)

Idaho(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Sand Mountain(quadrangle 1:24,000 scale)

Potlatch(quadrangle 1:100,000 scale)

Pullman(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Clearwater(hydrologic unit)

Clearwater(hydrologic accounting unit)

Lower Snake(hydrologic subregion)

Pacific Northwest(hydrologic region)

Geographic areas

Country State County
United States Idaho Latah

Public Land Survey System information

Meridian Township Range Section Fraction State
Boise 041 N 002 W 22 C SESW Idaho

Comments on the location information

  • ON AND NEAR CREST OF LONG RIDGE THAT EXTENDS S FROM MICA MTN

Commodities

Commodity Importance
Beryllium Critical Primary
Mica Primary
Uranium Tertiary

Materials information

Materials Type of material
Beryl Ore
Muscovite Ore
Apatite Gangue
Biotite Gangue
Hematite Gangue
Limonite Gangue
Quartz Gangue
Tourmaline Gangue

Alteration

  • (Local) Tourmalinization

Analytical data

Result 0.028 TO 1.4% BE IN 1942 SPECTROGRAPHIC ANALYSIS. PARTS OF SMALLER ZONES EST TO CONTAIN 25-35% BERYL. BRYANT (1939) COMPOSITE PEGMATITE SAMPLE: 84.6% SIO2, 6.1% AL2O3, 6.65% K2O, NA2O, 1.8% FEO, 0.58% BEO, 0.27 CA

Host and associated rocks

  • Host or associated Host
    Rock type
    Rock unit name Belt Supergroup
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Host
    Rock type Metamorphic Rock > Schist > Mica Schist
  • Host or associated Host
    Rock type Plutonic Rock > Pegmatite

Nearby scientific data

Main Entrance (1) -116.57933, 46.88956
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure name Belt Supergroup
Type of structure Regional
Structure name Steeply Dipping W Limb Of Anticline Of Great Width
Type of structure Local
Structure name Close Folds In Bedding And Schistosity

Ore body information

  • General form PEGMATITE
    Strike N01W
    Dip 60W
    Area 14HA
    Depth to top 0M
    Field Value
    Type of Orebody #1 PEGMATITE
    Primary mode of Origin HYDROTHERMAL
    Secondary mode of Origin CONT METASOMATIC
    Primary Ore Control FRACTURING
    Secondary Ore Control FAULTING
    Degree of Wallrock Alter. MODERATE
    Type of Wallrock Alter. #1 SERICITIC
    Strike And Dip N01W:60W
    Minimum Depth to Top 0
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 14
    Date of Last Modification 830616
  • General form LENS, TABULAR, PIPELIKE
    Strike N
    Dip 65 W
    Plunge STEEP S
    Thickness 15.24M
    Length 80.77M
    Depth to top 0M
    Depth to bottom 106.68M

Controls for ore emplacement

  • Pegmatite Lenses

Comments on the geologic information

  • THREE MAJOR BODIES, THE EAST, WEST, AND CENTRAL PEGMATITES, PLUS NUMEROUS SMALLER LENSES HAVE BEEN MINED

Economic information about the deposit and operations

Operation type Surface-Underground
Development status Past Producer
Commodity type Both
Deposit size Medium
Significant Yes
Discovery year 1888
Discoverer Woody and Lamb
Mining method Open Stope - Room and Pillar
Year of first production 1888
Milling method Handsort

Mining district

District name Avon Mining District

Mineral rights holdings

Type of mineral rights Patented

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Idaho Beryllium And Mica Corp.
  • Type Owner
    Owner Slette, Orville

Production statistics

  • Year 1910
    Period 1888-1910
    Description Hand Cobbed Mica, 1888-1910 725700 Kilograms
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Mica Mica 725.7mt
  • Year 1942
    Period 1911-1942
    Description Hand Cobbed Mica, 1911-1942 Few T Be, Carloads Mica
  • Year 1945
    Period 1943-1945
    Description Beryl Production, 1943-1945 453 Kilograms
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Mica Mica 587.4mt
    Major Beryllium Beryllium 0.45mt
  • Year 1954
    Period 1946-1954
    Description Beryl Production, 1946-1954 2100 Kilograms
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Beryllium Beryllium 2.1mt
    Major Mica Mica 458.6mt
  • Year 1959
    Period 1955-1959
    Description Beryl Production, 1955-1959 729 Kilograms
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Beryllium Beryllium 0.73mt
    Major Mica Mica 32.3mt

Comments on the production information

  • HISTORY OF PRODUCTION: HPUNI IS "A FEW TONS BERYL AND SEVERAL SEVERAL CARLOADS MICA. STERRETT IN STOLL, 1950.
  • MUCH GOOD GRADE BOOK MICA PRODUCED ALL RUBY-STAINED OR BETTER

Reserves and resources

  • Type In-situ
    Estimate year 1950
    Indicated 7495mt ore
    Demonstrated 7495mt ore
    Total resources 7495mt ore
    Commodity Subtype Grade units Group Importance Year
    Beryllium Be 0.1299 wt-pct Beryllium Major 1950
  • Type In-situ
    Estimate year 1950
    Indicated 67599mt ore
    Demonstrated 67599mt ore
    Total resources 67599mt ore
    Commodity Subtype Grade units Group Importance Year
    Beryllium Be 0.02 wt-pct Beryllium Major 1950
  • Type In-situ
    Estimate year 1968
    Indicated 235800mt ore
    Demonstrated 235800mt ore
    Total resources 235800mt ore
    Commodity Subtype Grade units Group Importance Year
    Beryllium Be 0.18 wt-pct Beryllium Major 1968

Comments on the reserve resource information

  • RESERVES BELOW # 4 LEVEL (STOLL, 1950). RESERVES ABOVE #4 LEVEL (STOLL, 1950). RESERVES IN OLD MINE DUMPS (PATTEE. ET. AL., 1968). RESERVES FOR THE ENTIRE DEPOSIT.

Workings at the site

  • Type of workings Surface/Underground
    Area 0.35HA
    Length 822.96M
    Overall length 243.84M
    Overall width 36.58M

Comments on the workings information

  • UNDERGROUND WORKINGS CONSIST OF 2 ADITS AND 3 LEVELS.

Comments on development

  • WORKINGS ON PATENTED CLAIM ; ECON.COM: CRYSTALS TOO SMALL, TOO FRACTURED. HEAVY TIMBERING REQUIRED IN CLAYEY GROUND

Reference information

Bibliographic references

Reporter information

Type Date Name Affiliation Comment
Reporter 20-MAR-1995 Raney, Russell G. U.S. Bureau of Mines
Reporter 01-DEC-1973 Puffett, Willard P. U.S. Geological Survey

Beyond USGS

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

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