Conjecture Mine

The Conjecture Mine is a silver mine located in Bonner county, Idaho at an elevation of 3,120 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: 3,120 Feet (951 Meters)

Primary Mineral: Silver

Lat, Long: 47.91611, -116.42917

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
Secondary: Gold
Secondary: Lead
Secondary: Zinc
Secondary: Copper


Location

State: Idaho
County: Bonner
District: Lakeview District


Land Status

Not available


Holdings

Not available


Workings

Type: Underground


Ownership

Owner Name: Conjecture Mines Inc.

Owner Name: Federal Resources Corp.


Production

Not available


Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1875
Discovery Year: 1888
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: M


Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains
Physiographic Detail: Selkirk Range


Mineral Deposit Model

Model Name: Polymetallic veins


Orebody

Form: IRREGULAR-PINCH AND SWELL


Structure

Type: R
Description: Purcell Trench To The North

Type: L
Description: Packsaddle-Johnson Fault, Spider Fault


Alterations

Alteration Type: L
Alteration Text: Silicification


Rocks

Name: Lamprophyre
Role: Associated
Age Type: Associated Rock
Age Young: Paleocene


Analytical Data

Not available


Materials

Ore: Argentite
Ore: Tetrahedrite
Ore: Sphalerite
Ore: Galena
Ore: Chalcopyrite
Gangue: Rhodochrosite
Gangue: Quartz
Gangue: Pyrite
Gangue: Siderite


Comments

Comment (Production): NO ACTUAL PRODUCTION FIGURES COULD BE FOUND. THE DISTRICT PRODUCED $2,500,000, WITH 24 TO 50 OZ/TON AG, $1.50/TON AU, $2.00/TON PB. CONJECTURE WAS THE MAIN PRODUCER.

Comment (Development): MINE WAS DISCOVERED IN 1888 BUT NOT LOCATED UNTIL 1894 ; ECON.COM: BAD GROUND AT 2000 FT LEVEL MAKES TUNNELING DANGEROUS

Comment (Geology): ST. REGIS - REVETT FMS., GREEN SILTITES & QUARTZITES. WALLACE FM., LIMESTONE, LIMY SILTSTONES & QUARTZITES.


References

Reference (Deposit): SAVAGE, C. N., 1967, GEOLOGY AND MINERAL RESOURCES OF BONNER COUNTY; IDAHO BUREAU OF MINES AND GEOLOGY, COUNTY REPORT NO. 6, 1967, P. 128

Reference (Deposit): SAMPSON, EDWARD, 1928, GEOLOGY AND SILVER ORE DEPOSITS OF THE PEND OREILLE DISTRICT, IDAHO: IDAHO BUREAU OF MINES AND GEOLOGY PAMPHLET 31, P. 25

Reference (Deposit): ROSS, C. P., 1941, THE METAL AND COAL MINING DISTRICTS OF IDAHO: IDAHO BUR. OF MINES AND GEOLOGY PAMPHLET 57, P. 263

Reference (Deposit): 1963 DIREXPL FEDERAL RESOURCES CORP. NEGATIV


Idaho Gold

Where to Find Gold in Idaho

"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.