Abandoned mines in Park County, Colorado

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   295 18.1%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   1,237 75.8%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   24 1.5%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   32 2.0%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   42 2.6%
6. Mills, tipples and facilities

   processing plants and hazardous structures
   2 0.1%
7. Other reclamation problems

   highwalls, subsidence, polluted or clogged water, fires, slides and gases in OSMRE's inventory
   1 0.1%

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. #835 Crusher

   Surface metal/non-metal · Park County Public Works · MSHA ID 0505148
   Abandoned 2024-09-04
2. 11 Mile Pit

   Surface metal/non-metal · Heartland Aggregate Mining · MSHA ID 0504462
   Abandoned 2018-10-18
3. Alma Placer

   Surface metal/non-metal · Timberline Enterprises · MSHA ID 0502577
   Abandoned 1982-09-23
4. ALMA PLANT

   Surface metal/non-metal · WILLITS COMPANY, INC. · MSHA ID 0504986
   Abandoned 2011-12-23
5. Alma Project Mill

   Facility metal/non-metal · London Mine Venture · MSHA ID 0503486
   Abandoned 1989-07-14
6. Alma Queen Mine

   Underground metal/non-metal · Alma Queen Mine · MSHA ID 0504086
   Abandoned 1986-03-24
7. Alma Resources Incorporated

   Surface metal/non-metal · Alma Resourcers Inc · MSHA ID 0504427
   Abandoned 1992-10-01
8. Amarillo Mine

   Surface metal/non-metal · Amarillo Mining Inc · MSHA ID 0503739
   Abandoned 1984-12-10
9. AMERICAN LODE MINE INC.

   Underground metal/non-metal · American Lode Mine Inc · MSHA ID 0503694
   Abandoned 1996-11-18
10. American Mill

    Facility metal/non-metal · Alma American Milling Corp · MSHA ID 0502254
    Abandoned 1984-07-03
11. Ansley / 9 Pit

    Surface metal/non-metal · Heartland Aggregate Mining · MSHA ID 0504600
    Abandoned 2022-11-01
12. Badger Basin #2

    Surface metal/non-metal · Colorado Department Of Highways · MSHA ID 0503407
    Abandoned 1981-05-01
13. Boston Placer

    Surface metal/non-metal · Tasmera Gold Mining Company Inc · MSHA ID 0503709
    Abandoned 1984-12-07
14. Box Creek Placer Mine

    Surface metal/non-metal · Extreme Excavation · MSHA ID 0504998
    Abandoned 2020-03-26
15. Combination Placer

    Surface metal/non-metal · Western States Minerals, LLC · MSHA ID 0503977
    Abandoned 2021-05-26
16. Destiny Pit

    Surface metal/non-metal · Gold Tamers LLC · MSHA ID 0505084
    Abandoned 2026-08-24
17. Detroit City Mine

    Underground metal/non-metal · Colorado Calumet Co Inc · MSHA ID 0505056
    Abandoned 2024-08-23
18. Duck Lake Pit

    Surface metal/non-metal · American Civil Constructors · MSHA ID 0504790
    Abandoned 2006-07-03
19. Fairplay

    Surface metal/non-metal · Sorrell Placer Mining LLC · MSHA ID 0505067
    Abandoned 2020-11-10
20. Fairplay Dredge Tailings

    Surface metal/non-metal · Southway Const Co Inc & Asphalt Gravel Prod Inc · MSHA ID 0503723
    Abandoned 1983-03-07
21. Fairplay Mine

    Surface metal/non-metal · Sorrell Placer Mining · MSHA ID 0505098
    Abandoned 2018-11-02
22. Fairplay Placer

    Surface metal/non-metal · High Speed Mining LLC · MSHA ID 0504551
    Abandoned 2016-12-15
23. Fairplay Quarry

    Surface metal/non-metal · South Park Aggregates Inc · MSHA ID 0503790
    Abandoned 1987-06-25
24. Fairplay Sewage Lagoon

    Surface metal/non-metal · Southway Const Co Inc & Asphalt Gravel Prod Inc · MSHA ID 0503451
    Abandoned 1979-08-03
25. Furman Ranch Peat

    Surface metal/non-metal · David L Bagle · MSHA ID 0500456
    Abandoned 1982-05-21
26. Gold Rae Mine

    Surface metal/non-metal · Gold Rae Corp · MSHA ID 0504071
    Abandoned 1987-03-27
27. Golden Gross Mine

    Surface metal/non-metal · Golden Cross Aggregates · MSHA ID 0504400
    Abandoned 2006-07-01
28. Great West

    Underground metal/non-metal · General Mine Services Corp · MSHA ID 0503874
    Abandoned 1985-07-03
29. Harper Placer

    Surface metal/non-metal · Ramah Mines Company · MSHA ID 0503676
    Abandoned 1982-09-23
30. Hector Placer

    Surface metal/non-metal · Environmental Mining & Reclamation Inc · MSHA ID 0504429
    Abandoned 1992-07-21
31. Hock Hocking

    Underground metal/non-metal · Hock Hocking Mineral Company LLC · MSHA ID 0500622
    Abandoned 2018-11-07
32. Jim Dandy Mine

    Underground metal/non-metal · Martin Trost Associates · MSHA ID 0503249
    Abandoned 1982-07-02
33. Lake George Mill

    Facility metal/non-metal · Lake George Industries · MSHA ID 0500775
    Abandoned 1982-07-13
34. Ling Mine

    Underground metal/non-metal · Century Exploration · MSHA ID 0503974
    Abandoned 1985-05-23
35. London Mine

    Underground metal/non-metal · Alma London Limited Liability Company · MSHA ID 0500571
    Abandoned 1991-12-09
36. Lota Rock Pit

    Surface metal/non-metal · Pridemore Construction Inc · MSHA ID 0504463
    Abandoned 1994-08-16
37. Mac-Bob

    Surface metal/non-metal · Robert E Snuggs-Roy Mc Cune · MSHA ID 0503111
    Abandoned 1984-12-10
38. Merrill Pit

    Surface metal/non-metal · Heartland Aggregate Mining · MSHA ID 0504402
    Abandoned 2026-02-18
39. Merrill Pit

    Surface metal/non-metal · Park County Road & Bridge · MSHA ID 0504597
    Abandoned 2022-09-30
40. Monte Cristo Mine

    Surface metal/non-metal · Monte Cristo Mining & Milling Company · MSHA ID 0503294
    Abandoned 1979-07-31
41. Moose Mine

    Underground metal/non-metal · Dorado Mining Company Inc · MSHA ID 0503594
    Abandoned 1982-09-23
42. Morning Star Mine

    Surface metal/non-metal · Dorado Mining Company Inc · MSHA ID 0503487
    Abandoned 1985-07-03
43. MW Sorter LLC (London Mine)

    Facility metal/non-metal · MW Sorter LLC · MSHA ID 0505178
    Abandoned 2026-07-28
44. North Star Mine

    Underground metal/non-metal · Alma American Mining Corp · MSHA ID 0503784
    Abandoned 1985-09-30
45. Orphan Boy Mine

    Surface metal/non-metal · Orphan Boy Limited · MSHA ID 0503751
    Abandoned 1984-12-10
46. Paris Mine

    Underground metal/non-metal · Chiwawa Mines Inc · MSHA ID 0502918
    Abandoned 1982-07-06
47. Peerless

    Underground metal/non-metal · Silver State Mining Corp · MSHA ID 0503746
    Abandoned 1985-07-05
48. Rainbow Group

    Underground metal/non-metal · Dallas Oil & Minerals · MSHA ID 0503715
    Abandoned 1985-03-26
49. Ramah Mines

    Facility metal/non-metal · Ramah Mines Company · MSHA ID 0503663
    Abandoned 1982-09-23
50. Russia Mine

    Underground metal/non-metal · Intermountain Resources Inc · MSHA ID 0503673
    Abandoned 1984-12-13
51. Sanborne sand and gravel

    Surface metal/non-metal · Miller Family Investments · MSHA ID 0504569
    Abandoned 2011-10-01
52. Screen Plant 1

    Surface metal/non-metal · Extreme Excavation · MSHA ID 0505062
    Abandoned 2017-10-11
53. Silver Gem Mine

    Underground metal/non-metal · Dorado Mining Company Inc · MSHA ID 0503745
    Abandoned 1985-07-03
54. Silver Heels Mine

    Surface metal/non-metal · Kendall Mining Corp · MSHA ID 0503662
    Abandoned 1984-08-01
55. Snow Storm Pit

    Surface metal/non-metal · M & M Mining Company · MSHA ID 0504345
    Abandoned 1991-08-26
56. Snow Storm Placer

    Surface metal/non-metal · Timberline Enterprises · MSHA ID 0502831
    Abandoned 1980-04-22
57. SWEETHOME

    Underground metal/non-metal · Colorado Calumet Company Inc · MSHA ID 0503062
    Abandoned 2004-11-01
58. T-Mec

    Surface metal/non-metal · T-Mec · MSHA ID 0503980
    Abandoned 1985-08-23
59. T-Pit Mine

    Surface metal/non-metal · Urania Exploration Inc · MSHA ID 0503556
    Abandoned 1982-05-17
60. Twin Sisters

    Facility metal/non-metal · Sr Operating Company Inc · MSHA ID 0503782
    Abandoned 1982-08-23
61. Union #5

    Underground metal/non-metal · Quasar Mine Services Corp (Usa) · MSHA ID 0503866
    Abandoned 1985-09-05
62. Universal Peat Sand & Gravel Incorporate

    Surface metal/non-metal · Universal Peat Sand & Gravel · MSHA ID 0500468
    Abandoned 1982-05-21

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

• San Juan County 3,913
• Lake County 3,672
• Gunnison County 2,703
• Saguache County 2,319
• San Miguel County 2,242
• Gilpin County 2,148
• Montrose County 2,077
• Custer County 2,062
• Clear Creek County 1,996
• Chaffee County 1,486
• Summit County 1,449
• Boulder County 1,083

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.