Abandoned mines in Custer County, Idaho

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   502 39.2%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   683 53.3%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   18 1.4%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   64 5.0%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   15 1.2%

A name is the label printed beside the symbol on the map. "First mapped" is the earliest topographic edition that shows the symbol, which bounds the feature's age from above; it is not the date it was worked. Unnamed features (most prospect pits, adits and shafts carry no label) are in the counts above but not this list.

1. Black Mine

   Underground metal/non-metal · M & S Mining Company · MSHA ID 1001501
   Abandoned 1989-07-18
2. Bulldog Mine

   Surface metal/non-metal · Greyhound Mining & Milling Inc · MSHA ID 1001479
   Abandoned 1982-04-05
3. Carbonate Mine

   Underground metal/non-metal · Fisher International Inc · MSHA ID 1000417
   Abandoned 1979-11-05
4. Carbonate Mine

   Underground metal/non-metal · Fisher International Inc · MSHA ID 1001652
   Abandoned 1985-07-26
5. Charles Dickens

   Underground metal/non-metal · United States Antimony Corp · MSHA ID 1001559
   Abandoned 1984-06-21
6. Clayton Silver Mines Inc

   Facility metal/non-metal · Clayton Silver Mines Inc · MSHA ID 1000142
   Abandoned 1991-10-01
7. Crazy Lumberjack

   Surface metal/non-metal · Arizona-Idaho Mining LLC · MSHA ID 1002032
   Abandoned 2003-07-21
8. Custer Mine

   Surface metal/non-metal · United States Antimony Corp · MSHA ID 1001734
   Abandoned 1990-08-16
9. Cyprus Mining Project #2

   Surface metal/non-metal · Liberty Drilling & Pump Company · MSHA ID 1001431
   Abandoned 1981-01-09
10. Empire

    Underground metal/non-metal · Konnex Resources, Inc. · MSHA ID 1002294
    Abandoned 2018-04-16
11. Empire Mill

    Facility metal/non-metal · Myko Inc · MSHA ID 1000457
    Abandoned 1981-06-15
12. Estes Mountain Mines

    Underground metal/non-metal · United States Antimony Corp · MSHA ID 1001558
    Abandoned 1988-09-30
13. Greyhound Mine

    Underground metal/non-metal · Yanke Machine Shop Inc · MSHA ID 1001352
    Abandoned 1989-03-01
14. GROUSE CREEK UNIT

    Surface metal/non-metal · Hecla Mining Company · MSHA ID 1001552
    Abandoned 1999-02-17
15. Grouse Creek Venture

    Underground metal/non-metal · Hecla Mining Company · MSHA ID 1001893
    Abandoned 1995-05-19
16. Hoodoo Mine

    Surface metal/non-metal · Dick Black · MSHA ID 1000503
    Abandoned 1980-10-09
17. Horseshoe Mine

    Underground metal/non-metal · Myko Inc · MSHA ID 1000213
    Abandoned 1978-11-22
18. Jehovah-Shammah

    Underground metal/non-metal · Shama Mineral-Chemical & Oil · MSHA ID 1001025
    Abandoned 1988-07-01
19. Lost Packer Mine

    Underground metal/non-metal · Lost Packer Mining Company · MSHA ID 1001469
    Abandoned 1996-03-27
20. MAHOGANY MINE

    Surface metal/non-metal · American Industrial Minerals · MSHA ID 1001964
    Abandoned 2001-09-10
21. Maranatha Mill

    Facility metal/non-metal · Maranatha Milling Company Inc · MSHA ID 1001568
    Abandoned 1983-06-15
22. Mill Creek Project

    Underground metal/non-metal · Domestic Power Development Company · MSHA ID 1001236
    Abandoned 1979-04-26
23. Montana Gulch Placer Mine

    Surface metal/non-metal · Mandymet Inc · MSHA ID 1001451
    Abandoned 1981-07-01
24. Obsidian Pit

    Surface metal/non-metal · Western Construction Inc · MSHA ID 1001407
    Abandoned 1980-01-01
25. Pacific 9a Mine

    Underground metal/non-metal · Umont Mining Company · MSHA ID 1000691
    Abandoned 1978-11-22
26. Phi Kappa Mine

    Underground metal/non-metal · Myko Inc · MSHA ID 1001262
    Abandoned 1981-06-15
27. PIONEER

    Surface metal/non-metal · Lost River Highway District · MSHA ID 1001995
    Abandoned 2001-04-01
28. Portable #1

    Surface metal/non-metal · Salmon River Sand & Gravel · MSHA ID 1002039
    Abandoned 2006-04-13
29. R & S Mine

    Underground metal/non-metal · R & S Mining Company · MSHA ID 1001629
    Abandoned 1984-05-10
30. Rain In The Face

    Underground metal/non-metal · R M Barrett · MSHA ID 1000955
    Abandoned 1978-09-06
31. Rams Horn

    Surface metal/non-metal · The Rock Works Mining Inc · MSHA ID 1001963
    Abandoned 2015-07-06
32. Ramshorn Slate Quarry

    Surface metal/non-metal · Stone Peddler Quarries · MSHA ID 1001833
    Abandoned 1989-07-20
33. RD. VALLEY REDI MIX

    Surface metal/non-metal · Rd Valley Redi Mix Inc · MSHA ID 1001879
    Abandoned 1997-04-16
34. Red Bird Mine

    Underground metal/non-metal · United States Antimony Corp · MSHA ID 1001644
    Abandoned 1987-08-17
35. Rob Roy

    Underground metal/non-metal · United States Antimony Corp · MSHA ID 1001631
    Abandoned 1984-06-21
36. Salmon River Red

    Surface metal/non-metal · Rock Works Mining Inc · MSHA ID 1002019
    Abandoned 2003-07-21
37. Salmon River Scheelite Mill

    Underground metal/non-metal · R M Barrett · MSHA ID 1000526
    Abandoned 1978-09-06
38. Sandy J

    Surface metal/non-metal · United States Antimony Corp · MSHA ID 1001607
    Abandoned 1984-06-21
39. Seafoam Mine

    Underground metal/non-metal · Umont Mining Company · MSHA ID 1001546
    Abandoned 1982-04-07
40. Sill Mine

    Underground metal/non-metal · Leroy Davis Leonard Fisher Partners · MSHA ID 1001314
    Abandoned 1978-09-06
41. Tenth Hole

    Surface metal/non-metal · Lost River Ready Mix · MSHA ID 1002117
    Abandoned 2010-08-10
42. Three Rivers Stone Corp

    Surface metal/non-metal · Three Rivers Stone Corporation · MSHA ID 1001672
    Abandoned 2013-12-12
43. Tungsten Jim Mine

    Underground metal/non-metal · Centennial Development Company · MSHA ID 1000223
    Abandoned 1980-03-04
44. Valley Creek

    Underground metal/non-metal · United States Antimony Corp · MSHA ID 1001755
    Abandoned 1989-07-01
45. Washington Mine

    Surface metal/non-metal · Washington Peak Mining Company · MSHA ID 1001006
    Abandoned 1978-09-06
46. Yankee Fork Pit

    Surface metal/non-metal · Sluder Construction · MSHA ID 1001050
    Abandoned 2025-03-11
47. Yankee Fork Placer

    Surface metal/non-metal · International Minerals & Development Corp · MSHA ID 1001640
    Abandoned 1984-07-25
48. Yankee Fork Silver & Gold Mill

    Facility metal/non-metal · United States Antimony Corp · MSHA ID 1001500
    Abandoned 1994-03-16

Status and date are as reported to MSHA by the operator. Each mine's own page carries its accident, citation and inspection record.

• Shoshone County 2,127
• Lemhi County 1,932
• Blaine County 1,606
• Owyhee County 1,364
• Idaho County 888
• Butte County 661
• Bonner County 412
• Valley County 389
• Boise County 353
• Elmore County 345
• Adams County 298
• Cassia County 274

1. USGS, Consolidated Prospect- and Mine-Related Features from 7.5- and 15-Minute Topographic Quadrangle Maps of the United States (USMIN)
   597,612 point and area features digitized from about 106,350 historical topographic maps published 1886–2006; public domain (CC0). A feature is a map symbol, not a field-verified site, and the map does not say whether it was still worked.
2. USGS Fact Sheet 2025–3003, The Abandoned Mine Inventory of the United States
   States that as of 2025 there is no comprehensive national inventory of abandoned mine features, and that the detailed national database now being built will not be published.
3. OSMRE, Abandoned Mine Land Inventory System (e-AMLIS), public Problems layer
   One row per abandoned mine land problem in a problem area, with its type, funding program and reclamation status; mostly coal mined before the 1977 Surface Mining Control and Reclamation Act. Coordinates are the problem area's.
4. MSHA, Mines dataset (Mine Data Retrieval System)
   Every mine registered with MSHA since the 1970s; a mine reads Abandoned or Abandoned and Sealed when its operator reported that status. Refreshed weekly.
5. US Census Bureau, 2023 cartographic county boundaries (1:500,000)
   Each feature's county is assigned by its coordinates against these boundaries, not copied from the source file.
6. GAO-20-238, Abandoned Hardrock Mines (March 2020)
   Federal agencies had identified at least 140,000 abandoned hardrock mine features on federal land and estimated more than 390,000 more not yet captured in their databases.
7. Abandoned Hardrock Mine Reclamation (AHMR) Program, US Department of the Interior
   The program the USGS inventory is compiled for. Its appropriations and the 674,000 field-confirmed feature count on this page were provided by the program manager, Office of Environmental Policy and Compliance, and are cited with permission (2026-09-08).
8. IMCC-NAAMLP Hardrock AML Report
   Page 48 carries the two figures this page leans on: USGS estimates 633,181 of the 725,690 mine features it recorded from historic topographic maps, 87 percent, are hardrock; and state and federal agencies have submitted more than 724,000 AML features to the national database being built, already more than the historic maps hold. Year-by-year AHMR funding is on page 35.