Abandoned mines in San Miguel County, Colorado

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   869 38.3%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   1,238 54.6%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   120 5.3%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   25 1.1%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   15 0.7%
6. Mills, tipples and facilities

   processing plants and hazardous structures
   1 0.0%

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. Alice No 2 Lc-Sr-Is

   Underground metal/non-metal · Edward E Miller · MSHA ID 0503033
   Abandoned 1978-05-18
2. Alta Project

   Surface metal/non-metal · Socorro Mining Inc · MSHA ID 0504409
   Abandoned 1992-05-26
3. Ann Lc-Sr-161

   Underground metal/non-metal · St Jude Mining Company · MSHA ID 0502980
   Abandoned 1978-05-04
4. Breezy

   Underground metal/non-metal · Urralburu Mining Company · MSHA ID 0503211
   Abandoned 1990-12-07
5. Burro Tunnel Or Burro

   Underground metal/non-metal · Umetco Minerals Corp · MSHA ID 0501819
   Abandoned 1983-12-14
6. Bush Canyon Mine

   Underground metal/non-metal · Larry Shumway · MSHA ID 0502811
   Abandoned 1979-09-25
7. C-Sr-10 Sublease

   Underground metal/non-metal · Shumway Mining Co · MSHA ID 0503433
   Abandoned 1982-11-01
8. C-SR-11

   Underground metal/non-metal · Highbury Resources Inc. · MSHA ID 0504829
   Abandoned 2007-04-10
9. C-Sr-12

   Underground metal/non-metal · Anschutz Mining Corp · MSHA ID 0502981
   Abandoned 1981-08-18
10. C-Sr-13

    Underground metal/non-metal · D C Bunker Mining Company · MSHA ID 0502786
    Abandoned 1983-01-17
11. C-SR-13a

    Underground metal/non-metal · Cotter Corp · MSHA ID 0502771
    Abandoned 1984-11-14
12. C-Sr-15-A

    Underground metal/non-metal · Union Carbide Corp · MSHA ID 0503418
    Abandoned 1981-12-23
13. C-Sr-16a

    Surface metal/non-metal · Trio Industries Inc · MSHA ID 0502740
    Abandoned 1978-05-18
14. Carnation

    Underground metal/non-metal · Pinon Ridge Mining LLC · MSHA ID 0501106
    Abandoned 1982-11-19
15. Civit Cat

    Underground metal/non-metal · Eagle Peak Mining Company · MSHA ID 0503105
    Abandoned 1978-11-16
16. Cougar C-Sr-15

    Underground metal/non-metal · Farmer & Sickels Mining · MSHA ID 0503464
    Abandoned 1981-08-18
17. Csr-10

    Underground metal/non-metal · Energy Fuels Nuclear Inc · MSHA ID 0503415
    Abandoned 1990-07-01
18. Dalrymple Placer Mine

    Surface metal/non-metal · Dalrymple Placer Mining · MSHA ID 0503717
    Abandoned 1982-08-22
19. Deep Creek Placer

    Underground metal/non-metal · B-Mining Company · MSHA ID 0504176
    Abandoned 1995-02-27
20. Deremo

    Underground metal/non-metal · Umetco Minerals Corp · MSHA ID 0501786
    Abandoned 1991-08-09
21. Dolores River

    Underground metal/non-metal · Minerals Recovery Corp · MSHA ID 0501716
    Abandoned 1985-04-23
22. Dorie Mine

    Surface metal/non-metal · San Miguel Gold Mines Inc · MSHA ID 0504012
    Abandoned 1990-04-30
23. Early Morning

    Surface metal/non-metal · D C Bunker Mining Company · MSHA ID 0502663
    Abandoned 1979-02-20
24. EL-JAY

    Surface metal/non-metal · Skelton Inc · MSHA ID 0503985
    Abandoned 1999-11-09
25. Ellison Mine

    Underground metal/non-metal · B-Mining Company · MSHA ID 0503241
    Abandoned 1985-07-08
26. Fox Mine

    Underground metal/non-metal · Cole & Co Mining · MSHA ID 0502800
    Abandoned 1979-05-14
27. Full Moon No 2

    Underground metal/non-metal · Union Carbide Corp · MSHA ID 0502741
    Abandoned 1981-06-17
28. Guthrie

    Surface metal/non-metal · Geyser Mining Company · MSHA ID 0500987
    Abandoned 1986-01-24
29. Helen M S

    Underground metal/non-metal · Ex-Terra Corp Ii · MSHA ID 0504089
    Abandoned 1985-11-07
30. Horseshoe Mine

    Underground metal/non-metal · Minerals Recovery Corp · MSHA ID 0503141
    Abandoned 1985-04-08
31. Ike #1

    Underground metal/non-metal · Anschutz Mining Corp · MSHA ID 0502789
    Abandoned 1981-03-20
32. Iron Crown

    Surface metal/non-metal · Spencer & Schooley · MSHA ID 0502609
    Abandoned 1978-05-04
33. Letty Jones Mine

    Underground metal/non-metal · Dravo Corp · MSHA ID 0502671
    Abandoned 1981-08-18
34. Mad Jack No 1

    Underground coal · Tri-Island Land & Cattle Company Inc · MSHA ID 0503497
    Abandoned and Sealed 1999-08-05
35. Nola Z C-Sr-16

    Underground metal/non-metal · Starks Mining · MSHA ID 0503084
    Abandoned 1979-01-04
36. Ophir 27

    Underground metal/non-metal · Ex-Terra Corp Ii · MSHA ID 0504088
    Abandoned 1985-11-07
37. Oyla Mine

    Underground metal/non-metal · Sage & Sage Mining Company · MSHA ID 0503194
    Abandoned 1979-04-11
38. Parrot Railroad Tunnel

    Underground metal/non-metal · Brooks Minerals Inc · MSHA ID 0503056
    Abandoned 1979-01-23
39. Patrick D C-Sr-16

    Underground metal/non-metal · St Jude Mining Company · MSHA ID 0503128
    Abandoned 1979-02-26
40. Paystreak

    Underground metal/non-metal · Union Carbide Corp · MSHA ID 0502397
    Abandoned 1982-03-19
41. Philura

    Underground metal/non-metal · Kelmine Corp · MSHA ID 0503219
    Abandoned 1980-10-07
42. Pond Mine

    Underground metal/non-metal · Switzler Mining Co · MSHA ID 0503086
    Abandoned 1981-06-17
43. Portable Crusher

    Surface metal/non-metal · Dolores County Road Department · MSHA ID 0503943
    Abandoned 2026-08-18
44. PORTABLE WASH PLANT

    Surface metal/non-metal · Telluride Gravel Inc · MSHA ID 0504497
    Abandoned 1997-06-12
45. Radium #6

    Underground metal/non-metal · Pierce Mining · MSHA ID 0503090
    Abandoned 1977-08-30
46. San Miguel County Placer

    Surface metal/non-metal · Skelton Inc · MSHA ID 0503108
    Abandoned 1985-04-23
47. Sawpit

    Underground metal/non-metal · Intermountain Mining Ltd · MSHA ID 0503775
    Abandoned 1984-03-23
48. Sego Lily Lou

    Underground metal/non-metal · Roedel Mining · MSHA ID 0501098
    Abandoned 1988-08-31
49. Shamrock No 1 2 3

    Underground metal/non-metal · Agatha Patricia Dalpez · MSHA ID 0502218
    Abandoned 1974-01-22
50. Slide Group

    Underground metal/non-metal · Randy Belisle · MSHA ID 0500531
    Abandoned 1977-02-03
51. Spars

    Underground metal/non-metal · Ex-Terra Corp Ii · MSHA ID 0504091
    Abandoned 1985-11-07
52. St Jude Mine

    Underground metal/non-metal · Pinon Ridge Mining LLC · MSHA ID 0503153
    Abandoned 2008-04-01
53. Strawberry Roan Mine

    Underground metal/non-metal · G & S Mining · MSHA ID 0501281
    Abandoned 1981-03-06
54. Summit-Black Jack

    Underground metal/non-metal · Jim C Butt · MSHA ID 0503546
    Abandoned 1990-03-29
55. Sun Cup

    Underground metal/non-metal · Minerals Recovery Corp · MSHA ID 0501679
    Abandoned 1985-04-23
56. Topaz

    Underground metal/non-metal · Pinon Ridge Mining LLC · MSHA ID 0503613
    Abandoned 2009-05-18
57. Uintah

    Underground metal/non-metal · W D Tripp Mining Company · MSHA ID 0503085
    Abandoned 1979-08-27
58. West Sunday

    Underground metal/non-metal · Pinon Ridge Mining LLC · MSHA ID 0503780
    Abandoned 2008-04-01
59. Wilmarth

    Surface metal/non-metal · D C Bunker Mining Company · MSHA ID 0502709
    Abandoned 1979-02-20
60. Windswept #1

    Underground metal/non-metal · Taminco Inc · MSHA ID 0503132
    Abandoned 1981-06-17
61. Woodie

    Underground metal/non-metal · Ex-Terra Corp Ii · MSHA ID 0504090
    Abandoned 1985-11-07
62. Zamboanga Mine

    Underground metal/non-metal · Zamboanga Mining · MSHA ID 0503871
    Abandoned 1985-04-25

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
• Gilpin County 2,148
• Montrose County 2,077
• Custer County 2,062
• Clear Creek County 1,996
• Park County 1,624
• 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.