Abandoned mines in Broadwater County, Montana

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   258 17.7%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   1,053 72.2%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   61 4.2%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   43 2.9%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   15 1.0%
6. Mills, tipples and facilities

   processing plants and hazardous structures
   8 0.5%
7. Other reclamation problems

   highwalls, subsidence, polluted or clogged water, fires, slides and gases in OSMRE's inventory
   21 1.4%

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.

Problem types carry OSMRE's priority prefix: P1 and P2 are threats to health, safety and property, P3 is environmental. A problem area is a cluster of problems reclaimed as one project; several rows can share one location.

1. A & H Placer

   Surface metal/non-metal · A & H Enterprise · MSHA ID 2401755
   Abandoned 1985-09-09
2. Alma

   Underground metal/non-metal · Eastman Mining · MSHA ID 2401683
   Abandoned 1983-10-29
3. Black Diamond Graphite Mine

   Surface metal/non-metal · United Minerals Company · MSHA ID 2401411
   Abandoned 1989-08-07
4. Black Friday

   Surface metal/non-metal · Silver Summit Narrow Vein Mining Group · MSHA ID 2402636
   Abandoned 2012-12-06
5. Chartam

   Surface metal/non-metal · Addwest Gold Inc · MSHA ID 2401604
   Abandoned 1989-05-09
6. CHARTAM

   Underground metal/non-metal · HOLMES MINING & CONSULTING LLC · MSHA ID 2402826
   Abandoned 2026-03-16
7. Custer Mill

   Facility metal/non-metal · Westgate Mining & Construction Inc · MSHA ID 2401569
   Abandoned 1984-04-27
8. Custer Mine

   Underground metal/non-metal · Westgate Mining & Construction Inc · MSHA ID 2401550
   Abandoned 1984-04-27
9. Diamond City Placer

   Surface metal/non-metal · Montana Bar Mining Inc · MSHA ID 2401691
   Abandoned 1984-05-14
10. Diamond Hill

    Underground metal/non-metal · Apollo Gold Inc Diamond Hill Mine · MSHA ID 2401960
    Abandoned 2003-04-18
11. Diamond Hill Project

    Underground metal/non-metal · Fausett Mine Services · MSHA ID 2402054
    Abandoned 1994-10-01
12. East Pacific Mine

    Underground metal/non-metal · Olympic Mining Corp · MSHA ID 2401221
    Abandoned 1982-07-28
13. Edna #1

    Underground metal/non-metal · Western Energy Company · MSHA ID 2401708
    Abandoned 1984-11-27
14. Faust Construction

    Surface metal/non-metal · Faust Construction · MSHA ID 2401523
    Abandoned 1988-09-15
15. Fredriksen #1

    Surface metal/non-metal · Mark L Johnson · MSHA ID 2401924
    Abandoned 1991-04-04
16. Gene L Willison

    Surface metal/non-metal · Gene L Willison · MSHA ID 2401487
    Abandoned 1991-12-18
17. Granite Hill #2

    Underground metal/non-metal · Arnold J Kolberg · MSHA ID 2401746
    Abandoned 1984-05-14
18. Greenhorn Gulch Placer

    Surface metal/non-metal · Global Oil & Gold Company · MSHA ID 2401828
    Abandoned 1987-08-26
19. Hassel 4611

    Surface metal/non-metal · John Wright & Alan Wright · MSHA ID 2401875
    Abandoned 1988-09-22
20. Hassel Mine

    Surface metal/non-metal · Ira Lee · MSHA ID 2401502
    Abandoned 1987-04-13
21. Hillside Pit

    Surface metal/non-metal · Hillside Drilling &Rock Stabilization · MSHA ID 2402793
    Abandoned 2026-04-13
22. Iron Cross

    Surface metal/non-metal · R & Iron Co · MSHA ID 2400179
    Abandoned 1979-08-09
23. Iron Mask Mine

    Underground metal/non-metal · Westgate Mining & Construction Inc · MSHA ID 2401529
    Abandoned 1982-07-29
24. January Mine

    Surface metal/non-metal · January Mining Company Inc · MSHA ID 2401559
    Abandoned 1982-07-29
25. Joe Dandy

    Underground metal/non-metal · Western Energy Company · MSHA ID 2401605
    Abandoned 1984-11-27
26. Keating Project

    Surface metal/non-metal · Northmont Resource & Exploration Co. · MSHA ID 2401863
    Abandoned 2013-04-01
27. Keno Placer

    Surface metal/non-metal · Jetco Company · MSHA ID 2401777
    Abandoned 1985-05-07
28. Kolberg Mill

    Facility metal/non-metal · Arnold J Kolberg · MSHA ID 2401705
    Abandoned 1986-09-02
29. L And R Placer

    Surface metal/non-metal · L & R Mining · MSHA ID 2401666
    Abandoned 1983-07-25
30. Lil Diamond

    Surface metal/non-metal · Lil Diamond Mining · MSHA ID 2401702
    Abandoned 1991-08-07
31. Lilly Mine

    Underground metal/non-metal · Carl Voss · MSHA ID 2401636
    Abandoned 1982-07-29
32. Marietta Mine

    metal/non-metal · Edgemount Resource Inc · MSHA ID 2401800
    Abandoned 1986-03-28
33. Mile High Placer Group

    Surface metal/non-metal · Mile High Placer · MSHA ID 2401904
    Abandoned 1996-02-14
34. Miller Mine

    Surface metal/non-metal · Olympus Resources LLC · MSHA ID 2402743
    Abandoned 2019-10-29
35. Miller Mt Mine & Mill

    Underground metal/non-metal · Global Oil & Gold Company · MSHA ID 2401609
    Abandoned 1988-04-20
36. Moulton Mine

    Underground metal/non-metal · Westgate Mining & Construction Inc · MSHA ID 2400448
    Abandoned 1984-05-14
37. Nancy Lee Mine

    Underground metal/non-metal · Western Silver Development Company · MSHA ID 2400320
    Abandoned 1982-12-27
38. Nila Tyrrel

    Surface metal/non-metal · Blue Bird Group · MSHA ID 2401335
    Abandoned 1983-07-25
39. Ohio Mine

    Surface metal/non-metal · D&S Mining and Exploration · MSHA ID 2401779
    Abandoned 2019-10-29
40. Pioneer Mine

    Underground metal/non-metal · Virgil C Sells · MSHA ID 2401608
    Abandoned 1986-03-28
41. Portable

    Surface metal/non-metal · Legacy Mining LLC · MSHA ID 2402681
    Abandoned 2020-07-23
42. Portable Screening

    Surface metal/non-metal · Radersburg Mining Company · MSHA ID 2401749
    Abandoned 1988-07-11
43. PORTORO QUARRY

    Surface metal/non-metal · I C M Inc · MSHA ID 2402134
    Abandoned 1999-08-23
44. Radersburg Quarry

    Surface metal/non-metal · White & Mc Neil Excavating · MSHA ID 2401778
    Abandoned 1985-12-09
45. Reclaim LLC

    Surface metal/non-metal · Reclaim LLC · MSHA ID 2402638
    Abandoned 2014-11-18
46. Riverside Contracting Inc 2

    Surface metal/non-metal · Riverside Contracting Inc · MSHA ID 2402687
    Abandoned 2015-06-02
47. Rolling Glen Ranch Sand and Gravel

    Surface metal/non-metal · Nitty Gritty LLC · MSHA ID 2402474
    Abandoned 2008-04-01
48. Seahawk Incorporated

    Surface metal/non-metal · Seahawk Inc · MSHA ID 2401713
    Abandoned 1995-06-09
49. Spokane Hills Mine

    Underground metal/non-metal · Westgate Mining & Construction Inc · MSHA ID 2401540
    Abandoned 1982-06-04
50. SPOKANE HILLS QUARRY

    Surface metal/non-metal · Spokane Minerals Limited · MSHA ID 2401988
    Abandoned 2001-09-24
51. St Louis Mine

    Surface metal/non-metal · United Minerals Company · MSHA ID 2401522
    Abandoned 1982-09-30
52. Townsend Mine

    Surface metal/non-metal · Indian Creek Development Inc · MSHA ID 2401633
    Abandoned 1986-01-03
53. Townsend Placer

    Surface metal/non-metal · Townsend Mining · MSHA ID 2401720
    Abandoned 1985-05-07
54. United Minerals Company

    Facility metal/non-metal · United Minerals Company · MSHA ID 2401707
    Abandoned 1987-06-12
55. Vulture Mine

    Underground metal/non-metal · R G Boyles M D · MSHA ID 2401231
    Abandoned 1979-10-10
56. WERTZ SAND & GRAVEL

    Surface metal/non-metal · Wertz Sand & Gravel · MSHA ID 2401795
    Abandoned 2000-09-27
57. Winston Gold Mining Corp.

    Underground metal/non-metal · Winston Gold Mining Corp. · MSHA ID 2402651
    Abandoned 2022-08-10
58. Yahoo Mine

    Surface metal/non-metal · Behsits Mining Company · MSHA ID 2401823
    Abandoned 1986-08-25

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

• Madison County 3,766
• Silver Bow County 2,397
• Jefferson County 1,973
• Lewis and Clark County 1,862
• Beaverhead County 1,378
• Carbon County 769
• Powell County 741
• Granite County 719
• Cascade County 708
• Deer Lodge County 688
• Fergus County 550
• Meagher County 440

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.