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Conjecture Mine

Past Producer in Bonner county in Idaho, United States with commodities Silver, Gold, Antimony, Lead, Zinc, Copper, Tungsten
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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. Land status
  17. Ownership information
  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 10073378
MRDS ID W019433
Record type Site
Current site name Conjecture Mine
Related records 10168284

Geographic coordinates

Geographic coordinates: -116.42299, 47.91764 (WGS84)
Elevation 975
Relative position 6 MI S OF LAKEVIEW, SE OF PEND OREILLE LAKE

Site location context

Political divisions (FIPS codes)

Bonner(county)

Idaho(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Lakeview(quadrangle 1:24,000 scale)

Coeur D'Alene(quadrangle 1:100,000 scale)

Spokane(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Pend Oreille Lake(hydrologic unit)

Pend Oreille(hydrologic accounting unit)

Kootenai-Pend Oreille-Spokane(hydrologic subregion)

Pacific Northwest(hydrologic region)

Federal lands

Idaho Panhandle National Forests(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Idaho Bonner

Public Land Survey System information

Meridian Township Range Section Fraction State
Boise 053N 001W 26 Idaho

Comments on the location information

  • LIES A MILE BELOW THE WEBER ON GOLD CREEK

Commodities

Commodity Importance
Silver Primary
Gold Primary
Antimony Critical Tertiary
Lead Tertiary
Zinc Critical Tertiary
Copper Tertiary
Tungsten Critical Tertiary

Materials information

Materials Type of material
Argentite Ore
Boulangerite Ore
Chalcopyrite Ore
Galena Ore
Proustite Ore
Tetrahedrite Ore
Wolframite Ore
Pyrite Gangue
Quartz Gangue
Rhodochrosite Gangue

Alteration

  • (Local) Siliceous; Leaching

Analytical data

Result AVERAGE GRADE ORE RANGED 20 TO 40 OZ AG / TON ASSAYS ON 700 FT LEVEL: 0.04 OZ AU, 0.165 % PB, AND 0.65 % ZN / TON.

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock
    Rock unit name Lower Member Wallace Formation-Calcareous Rocks;St. Regis Formation-Siltite And Argillite
    Rock description Lower Member Wallace Formation-Calcareous Rocks;St. Regis Formation-Siltite And Argillite
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Argillite

Nearby scientific data

(1) -116.42299, 47.91764
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Packsaddle Fault To The W; Casade Fault To The E.
Type of structure Local
Structure description Faulting; Belt Rocks Strike Generally N, Dip E; Brecciation

Ore body information

  • General form MASSIVE
    Strike N 30 DEG E
    Dip 65 DEG N
    Length 3657.6M
    Width 1.68M
  • General form MASSIVE
    Dip 65 DEG N
  • General form MASSIVE
    Dip 65 DEG N

Controls for ore emplacement

  • Fissure; Shear Zone; Fractures

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1894

Mining district

District name Lakeview District

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Conjecture Mines, Inc. Or Duval
    First year 1968
  • Type Owner
    Owner D. E. Majer And L. H. Funnel

Comments on the production information

  • SMALL PRODUCTION OF AG ORE IN LATE 1880'S. EARLY SHIPMENTS TO VALUE OF ABOUT $70000.

Comments on the reserve resource information

  • FEDERAL RESOURCES CORP. ( 1956 - 1964 ) DEVELOPED 100000 TONS OF ORE AVERAGING 20 OZ AG/TON ON 1000 FT. LEVEL

Workings at the site

  • Type of workings Underground
    Length 5859.78M
    Overall depth 778.15M

Comments on the workings information

  • 80 - TON FLOTATION MILL; OFFICE BUILDING; 2 HOIST HOUSES; CAMPHOUSE; ASSAY OFFICE; TIMBER SHED; COMPRESSOR; LOCOMOTIVE; CARS; DOZER; LOADER; DIAMOND DRILLING

Comments on development

  • 15 (?) PATENTED CLAIMS; OVER 100 UNPATENTED CLAIMS. DUVAL CORP. LEASED PROPERTY BETWEEN 1967 AND 1970; DUVAL CONDUCTED SURFACE EXPLORATION INCLUDING SOIL SAMPLING, DETAILED MAPPING UNDERGROUND EXPLORATION, AND CORE - DRILLING TO DEPTH OVER 4000 FT FROM SURFACE.

Reference information

Bibliographic references

  • Deposit

    SAVAGE, C. N., 1967 , GEOLOGY AND MINERAL RESOURCES OF BONNER COUNTY: IDAHO BUREAU OF MINES AND GEOLOGY COUNTY REPT. 6 , 131 P.

  • Deposit

    SAMPSON, E., 1928 , GEOLOGY AND SILVER ORE DEPOSITS OF THE PEND OREILLE DISTRICT, IDAHO: IDAHO BUREAU OF MINES AND GEOLOGY PAMPHLET 31 , 25 P.

  • Deposit

    MAC DONALD, D. F., 1906 , ECONOMIC FEATURES OF NORTHERN IDAHO AND NORTHWESTERN MONTANA: U. S. GEOLOGICAL SURVEY BULL. 285 , P. 41 - 52

  • Deposit

    KUN, P., 1974 , GEOLOGY AND MINERAL RESOURCES OF THE LAKEVIEW, MINING DISTRICT, IDAHO: IDAHO BUREAU OF MINES AND GEOLOGY PAMPHLET 156 , 47 P.

  • Deposit

    5) SPOKANE CHRONICLE, MAR. 10 , 1967

  • Deposit

    1906 OTHER D. F. MAC DONALD, BULL. 285

  • Deposit

    1920 DIREXPL LAKEVIEW SILVER MINES CO.

  • Deposit

    1928 GEOLMAP IDAHO BUREAU OF MINES AND GEOLOGY PAMPHLET 31

  • Deposit

    1951 DIREXPL CONJECTURE MINES, INC.

  • Deposit

    1956 DIREXPL FEDERAL RESOURCES CORP.

  • Deposit

    1967 GEOLMAP IDAHO BUREAU OF MINES AND GEOLOGY CO. REPT. 6 {{ 1974 GEOLMAP IDAHO BUREAU OF MINES AND GEOLOGY PAMPHLET 156

  • Production

    KUN, P., 1974 , IDAHO BUREAU OF MINES AND GEOLOGY PAMPHLET 156 , 47 P. { SAVAGE, C. N., 1967 , IDAHO BUREAU OF MINES AND GEOLOGY CO. REPT. 6

  • Reserve-Resource

    SPOKANE CHRONICLE, JUNE 7 , 1971

General comments

Subject category Comment text
Deposit CONJECTURE - KEEP COOL - SILVER LEAF VEIN IS 12000 FT. LONG
Deposit 800 FT DISPLACEMENT IN MINE AREA ON SPIDER FAULT (STRIKES SW, DIPS 65 DEG W). FIVE HIGH GRADE SHOOTS ASSAYED 0.06 TO 890.02 OZ AG, 0.02 TO 0.83 OZ AU, 3.3 % CU, 5.5 % ZN, AND 35.2 % PB / TON PB ISOTOPES: PB206/PB204 = 18.997 ; PB207/PB204 15.649 ; PB208/PB204 = 39.244. FED'L RESOURCES CORP. FORMER OPERATOR 1961 - 1964

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-1974 Miller, Pat J. U.S. Geological Survey

Beyond USGS

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

External references

Maps centered on this site