Coeur Mine

The Coeur Mine is a silver mine located in Shoshone county, Idaho at an elevation of 3,051 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

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.

Site Name

Primary: Coeur Mine
Secondary: Rainbow Mine
Secondary: Mineral Point
Secondary: Coeur d'Alene Mines

Commodity

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

Location

State: Idaho
County: Shoshone
District: Evolution

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: Coeur d'Alene Mines Corp
Percent: 100.0
Home Office: Coeur d'Alene, Idaho
Years: 2000 -

Owner Name: Silver Valley Resources Corp.
Percent: 100.0
Home Office: Wilmington, Delaware
Years: 1995 - 2000

Owner Name: Coeur d'Alene Mines Corp.
Percent: 50.00
Home Office: Coeur d'Alene, Idaho
Years: 1991 - 1995

Owner Name: Coeur d'Alene Mines
Percent: 45.00
Home Office: Coeur d'Alene, Idaho
Years: 1990 - 1991

Owner Name: Coeur d'Alene Mines Corp.
Percent: 40.00
Home Office: Coeur d'Alene, Idaho
Years: 1968 - 1990

Owner Name: Hecla Mining Co.
Percent: 5.00
Home Office: Coeur d'Alene, Idaho
Years: 1968 - 1990

Owner Name: Callahan Mining Corp.
Percent: 5.00
Home Office: New York
Years: 1968 - 1991

Owner Name: Coeur d'Alene Mines Inc
Percent: 50.00
Home Office: Coeur d'Alene, Idaho
Years: 1964 - 1968

Owner Name: Asarco, Inc.
Percent: 50.00
Home Office: New York
Years: 1964 - 1968

Owner Name: Rainbow Mining and Milling Co.
Percent: 100.0
Home Office: Spokane, Washington
Years: 1907 - 1968

Owner Name: Coeur d'Alene Mines Corp.
Percent: 100.0
Home Office: Coeur d'Alene, Idaho
Years: 1940 - 1964

Owner Name: Coeur d'Alene Mines Corp.
Percent: 100.0
Home Office: Coeur d'Alene, Idaho
Years: 1928 - 1940

Owner Name: Evolution Mining Co.
Percent: 100.0
Home Office: Spokane, Washington
Years: 1927 - 1927

Owner Name: Mineral Point Mining Co.
Percent: 100.0
Home Office: Wallace, Idaho
Years: 1904 - 1940

Owner Name: Mineral Point Mining and Milling Co.
Percent: 100.0
Years: 1891 - 1895

Production

Year: 1952
Time Period: 1938-1952
Mined: 398707.000 mt
Material type: Ore Milled Mineral Point Mine
Year: 1998
Time Period: 1974-1998
Mined: 2262665.000 mt
Material type: Ore Milled Coeur Mine

Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: HYDROTHERMAL VEIN AND REPLACEMENT
Plant Type: Beneficiation (Mill)
Plant Subtype: Flotation
Operation Type: Underground
Mining Method: Filled Stopes - Horiz Cut and Fill W/Tailings
Milling Method: Flotation
Year First Production: 1892
Year Last Production: 1998
Discovery Year: 1885
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: Y
Deposit Size: L

Physiography

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

Mineral Deposit Model

Model Name: Polymetallic veins

Orebody

Name: Commodore Truxton Vein
Form: PINCH AND SWELL

Name: Siderite Vein
Form: PINCH AND SWELL

Name: 483 Vein
Form: PINCH AND SWELL

Name: Cross Vein
Form: PINCH AND SWELL

Name: Wire Silver Vein
Form: PINCH AND SWELL

Name: 356 Vein
Form: PINCH AND SWELL

Name: 425 Vein
Form: PINCH AND SWELL

Name: 400 Vein
Form: PINCH AND SWELL

Structure

Type: L
Description: Silver Standard Fault, N60W 65SW, shows normal movement.

Type: R
Description: Fort Wayne Fault, N60W 60-70SW, shows normal displacement.

Type: L
Description: Mineral Point Fault

Type: R
Description: St. Elmo Fault, N50W 60SW, shows reverse movement.

Type: L
Description: Polaris Fault, N55W 50-75SW, cuts north limb of Big Creek anticline, a tension fracture extending from the Osburn to the Placer Creek faults.

Type: R
Description: Big Creek Anticline, north overturned limb strikes N55W, axial plunge 10 to 20 N, axial plane dips 55SW.

Type: R
Description: Placer Creek Fault, 3.5 km south of Coeur shaft

Type: R
Description: Osburn Fault, 1.5 km north of Coeur shaft, N75W 60-80SW

Alterations

Not available

Rocks

Name: Quartzite
Role: Host
Age Type: Host Rock Unit
Age Young: Neoproterozoic

Name: Quartzite
Role: Host
Age Type: Host Rock Unit
Age Young: Neoproterozoic

Analytical Data

Analytical Data: THE "400" VEIN (565 FT LONG, AVG 8 FT WIDE) ON 2200 LEVEL ASSAYED 28 OZ AG, 0.9% CU
Analytical Data: 744 FT VEIN, AVG 8 FT WIDE, CONTAINED 31.4 OZ/TON AG, 1.1% CU
Analytical Data: THE "483 VEIN" ON 3400 LEVEL ASSAYED 200 AND 118 OZ AG AND 4.1% CU OVER AVERAGE WIDTH OF 1.6 FT . SIX FT OF CORE FROM A 13 FT WIDE VEIN AT THE 3400 LEVEL ASSAYED 39.9 OZ AG AND .8% CU, AND THE REMAINING 7 FT ASSAYED 27.6 OZ AG AND .6% CU. ANOTHER VEIN ASSAYED 52.9 OZ AG AND 2.7% CU.

Materials

Ore: Stibnite
Ore: Chalcopyrite
Ore: Tetrahedrite
Ore: Boulangerite
Ore: Silver
Ore: Galena
Ore: Sphalerite
Gangue: Ankerite
Gangue: Quartz
Gangue: Siderite
Gangue: Pyrite
Gangue: Arsenopyrite
Trace: Jamesonite

Comments

Comment (Development): The Siderite vein, the main vein of the Mineral Point mining operation was discovered by Coeur d'Alene Mines Corp in 1935. The Commodore Truxton vein was discovered in 1945 and the Wire Silver vein in 1950 in the course of mine development and exploration. The first orebody in the modern Coeur mine operations was discovered in 1969 by Asarco, Inc.

Comment (Workings): THE 3400 FT LEVEL IS CONNECTED TO GALENA MINE. NEW SHAFT IS OVER 1000 FT BELOW SEA LEVEL. MINE IS ON 748 ACRES OF LAND.

Comment (Geology): ST. REGIS - REVETT TRANSITION ZONE EXTENDS NEAR SURFACE TO 3700 FT LEVEL

Comment (Deposit): 16 OF THE PATENTED CLAIMS WERE LEASED FROM THE COEUR D'ALENE MINES CORP AND 22 OF THE PATENTED CLAIMS WERE LEASED FROM THE RAINBOW MIN. AND MILL. CO. IN 1966 ; THESE 2 COMPANIES MERGED IN 1968

Comment (Development): 38 PATENTED, 4 UNPATENTED CLAIMS. ABOUT 53299 FT TOTAL DIAMOND DRILLING. CALADAY CROSSCUT TO HALFWAY POINT OVER 2000 FT FROM PORTAL. ; TOTAL$: 20 ; MILL$: 10 ; MILL.CAP: 502 TPD ; ECON.YEAR: 1976 ; ECON.COM: EXPLORATION AND DEVELOPMENT WORK TOTALED $10 MILLION

Comment (Production): Production for Mineral Point mine from Coeur d'Alene Mines Corp. annual reports 1938-1952.

Comment (Reserve-Resource): Additional resource reported in Coeur d'Alene Mines Corp. annual report for 1998. Reserves depleted.

Comment (Orebody): The 483 vein is S-shaped, having been rotated by left-lateral shear.

Comment (Production): Production for Coeur mine from Coeur d'Alene Mines Corp. and Asarco, Inc. annual reports.

References

Reference (Deposit): Fryklund, V.C., Jr., 1964, Ore deposits of the Coeur d'Alene district, Shoshone County, Idaho: U.S. Geological Survey Professional Paper 445, 103 p.

Reference (Deposit): Robinson, Robert Blair, 1980, Structural geology and structural origin of the veins of the Coeur mine, Coeur d'Alene mining district, Shoshone County, Idaho: Moscow, University of Idaho, MS thesis, 98 p.

Reference (Deposit): Hackbarth, C.J., and Petersen, U., 1982, Zoning in veins of the Galena and Coeur mines, Coeur d'Alene mining district, Idaho: Geological Society of America Abstracts with Programs, v. 14, no. 6, p. 314.

Reference (Deposit): Dahl, Mary Katherine, 1981, Structural and stratigraphic control of ore through the Crescent, Sunshine, Silver Summit, Coeur and Galena mines, Coeur d'Alene mining district, Idaho: Moscow, Univeristy of Idaho, MS thesis, 97 p.

Reference (Deposit): Hobbs, S. W., And Others, 1965 , Geology Of The Coeur D'Alene District, Shoshone County, Idaho: USGS Prof. Paper 478 , 139 P.

Reference (Deposit): ENG. MINING JOUR., 1976 , ASARCO'S NEWLY DEDICATED COEUR SILVER MINE WILL BE FOURTH LARGEST IN US: ENG. MINING JOUR., V. 177 , NO. 7 , P. 23 - 27

Reference (Deposit): CARTER, R. A., AND LI, TAM., 1976 , IDAHO'S COEUR D'ALENE DISTRICT SETS SIGHTS ON RECORD PRODUCTION: MINING ENG., V. 28 , NO. 7 , P. 49 - 64

Idaho Gold

"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: Where to Find Gold in Idaho.