Conjecture Mine

The Conjecture Mine is a silver and gold mine located in Bonner county, Idaho at an elevation of 3,199 feet.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Name: Conjecture Mine  

State:  Idaho

County:  Bonner

Elevation: 3,199 Feet (975 Meters)

Primary Mineral: Silver, Gold

Lat, Long: 47.91778, -116.42194

Map: View on Google Maps

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.


Satelite image of the Conjecture Mine

Conjecture Mine MRDS details

Site Name

Primary: Conjecture Mine


Commodity

Primary: Silver
Primary: Gold
Tertiary: Antimony
Tertiary: Lead
Tertiary: Zinc
Tertiary: Copper
Tertiary: Tungsten


Location

State: Idaho
County: Bonner
District: Lakeview District


Land Status

Land ownership: Private
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.


Holdings

Not available


Workings

Type: Underground


Ownership

Owner Name: D. E. Majer And L. H. Funnel

Owner Name: Conjecture Mines, Inc. Or Duval
Years: 1968 -


Production

Not available


Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Discovery Year: 1894
Discovery Method: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S


Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains
Physiographic Detail: Coeur D'Alene Mountains


Mineral Deposit Model

Not available


Orebody

Form: MASSIVE

Form: MASSIVE

Form: MASSIVE


Structure

Type: R
Description: Packsaddle Fault To The W; Casade Fault To The E.

Type: L
Description: Faulting; Belt Rocks Strike Generally N, Dip E; Brecciation


Alterations

Alteration Type: L
Alteration Text: Siliceous; Leaching


Rocks

Name: Clastic Sedimentary Rock
Role: Host
Age Type: Associated Rock Unit
Age Young: Neoproterozoic

Name: Clastic Sedimentary Rock
Role: Host
Age Type: Host Rock
Age Young: Neoproterozoic


Analytical Data

Analytical Data: 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.


Materials

Ore: Argentite
Ore: Galena
Ore: Tetrahedrite
Ore: Chalcopyrite
Ore: Boulangerite
Ore: Wolframite
Ore: Proustite
Gangue: Rhodochrosite
Gangue: Quartz
Gangue: Pyrite


Comments

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

Comment (Location): LIES A MILE BELOW THE WEBER ON GOLD CREEK

Comment (Production): SMALL PRODUCTION OF AG ORE IN LATE 1880'S. EARLY SHIPMENTS TO VALUE OF ABOUT $70000.

Comment (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.

Comment (Deposit): CONJECTURE - KEEP COOL - SILVER LEAF VEIN IS 12000 FT. LONG

Comment (Workings): 80 - TON FLOTATION MILL; OFFICE BUILDING; 2 HOIST HOUSES; CAMPHOUSE; ASSAY OFFICE; TIMBER SHED; COMPRESSOR; LOCOMOTIVE; CARS; DOZER; LOADER; DIAMOND DRILLING

Comment (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


References

Reference (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

Reference (Reserve-Resource): SPOKANE CHRONICLE, JUNE 7 , 1971

Reference (Deposit): 1956 DIREXPL FEDERAL RESOURCES CORP.

Reference (Deposit): 1967 GEOLMAP IDAHO BUREAU OF MINES AND GEOLOGY CO. REPT. 6 {{ 1974 GEOLMAP IDAHO BUREAU OF MINES AND GEOLOGY PAMPHLET 156

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

Reference (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.

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

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

Reference (Deposit): 5) SPOKANE CHRONICLE, MAR. 10 , 1967

Reference (Deposit): 1906 OTHER D. F. MAC DONALD, BULL. 285

Reference (Deposit): 1920 DIREXPL LAKEVIEW SILVER MINES CO.

Reference (Deposit): 1928 GEOLMAP IDAHO BUREAU OF MINES AND GEOLOGY PAMPHLET 31

Reference (Deposit): 1951 DIREXPL CONJECTURE MINES, INC.


Idaho Gold

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"Where to Find Gold in Idaho" looks at the density of modern placer mining claims along with historical gold mining locations and mining district descriptions to determine areas of high gold discovery potential in Idaho. Read more at Where to Find Gold in Idaho.