Abandoned mines in Weld County, Colorado

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   68 28.0%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   6 2.5%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   20 8.2%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   115 47.3%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   22 9.1%
6. Other reclamation problems

   highwalls, subsidence, polluted or clogged water, fires, slides and gases in OSMRE's inventory
   12 4.9%

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. 115 DP

   Surface metal/non-metal · Varra Companies, Inc. · MSHA ID 0504759
   Abandoned 2019-05-31
2. 115 WP 416

   Surface metal/non-metal · Varra Companies Inc · MSHA ID 0504105
   Abandoned 2019-03-25
3. 117 DP

   Surface metal/non-metal · Varra Companies, Inc. · MSHA ID 0501840
   Abandoned 2019-05-31
4. 117 WP

   Surface metal/non-metal · Raptor Materials LLC · MSHA ID 0503788
   Abandoned 2024-12-11
5. 120 DP

   Surface metal/non-metal · VARRA COMPANIES INC · MSHA ID 0504643
   Abandoned 2019-07-19
6. 2100 PTS

   Surface metal/non-metal · Varra Companies Inc · MSHA ID 0502846
   Abandoned 2019-07-19
7. 35TH AVENUE PLANT

   Surface metal/non-metal · Camas Colorado Inc · MSHA ID 0503139
   Abandoned 1999-02-02
8. 408 PTS

   Surface metal/non-metal · Varra Companies Inc · MSHA ID 0504042
   Abandoned 2016-08-30
9. Aggregate Sand And Soil Incorporated

   Surface metal/non-metal · Aggregate Sand & Soil Inc · MSHA ID 0504056
   Abandoned 1991-01-30
10. ALLIED PORTABLE CRUSHING

    Surface metal/non-metal · Allied Portable Crushing/Recycling · MSHA ID 0504686
    Abandoned 2002-11-04
11. Armstead Pit

    Surface metal/non-metal · Weld County Corp · MSHA ID 0503991
    Abandoned 1989-07-07
12. ASCI CR 22

    Surface metal/non-metal · Asphalt Specialties Co Inc · MSHA ID 0504690
    Abandoned 2020-10-02
13. ASCI CR 23

    Surface metal/non-metal · Asphalt Specialties Co Inc · MSHA ID 0504848
    Abandoned 2020-01-14
14. Baumgartner

    Surface metal/non-metal · Colorado Department Of Highways · MSHA ID 0503387
    Abandoned 1979-08-27
15. Bernhardt Gravel Mine

    Surface metal/non-metal · BURNCO Colorado LLC · MSHA ID 0504654
    Abandoned 2025-05-12
16. Boulder Creek Pit

    Surface metal/non-metal · Frontier Materials · MSHA ID 0504096
    Abandoned 1988-04-15
17. Brighton Pit

    Surface metal/non-metal · South Platte Aggregates Inc · MSHA ID 0504141
    Abandoned 1989-07-07
18. Carbon Valley Resource

    Surface metal/non-metal · L.G. Everist, Inc. · MSHA ID 0503707
    Abandoned 2025-09-08
19. Carr Gravel Resource

    Surface metal/non-metal · L.G. Everist, Inc. · MSHA ID 0504441
    Abandoned 2014-08-27
20. Centennial Resources

    Surface metal/non-metal · Hall-Irwin Corp · MSHA ID 0504752
    Abandoned 2002-06-26
21. Challenger

    Surface metal/non-metal · Sterling Sand & Gravel Company · MSHA ID 0504172
    Abandoned 1989-03-09
22. City of Greeley Gravel Pit

    Surface metal/non-metal · Miller-HFI, LLC · MSHA ID 0504922
    Abandoned 2018-10-18
23. Cottonwood

    Surface metal/non-metal · Western Paving Construction Company · MSHA ID 0504387
    Abandoned 1992-06-16
24. CR - 27

    Surface metal/non-metal · Asphalt Specialties Co., Inc · MSHA ID 0505051
    Abandoned 2024-10-01
25. CR 44

    Surface metal/non-metal · Asphalt Specialties · MSHA ID 0504798
    Abandoned 2024-04-29
26. CR-26

    Surface metal/non-metal · Asphalt Specialties Co Inc · MSHA ID 0504699
    Abandoned 2023-01-25
27. CR-29

    Surface metal/non-metal · Asphalt Specialties Co., Inc. · MSHA ID 0505095
    Abandoned 2023-01-25
28. CR-45

    Surface metal/non-metal · Asphalt Specialties Co., Inc · MSHA ID 0505089
    Abandoned 2022-04-27
29. Crossfire Front Range Plant #2

    Surface metal/non-metal · Crossfire Aggregate Services, LLC · MSHA ID 0505052
    Abandoned 2018-10-19
30. Crusher 2

    Surface metal/non-metal · Extreme Excavation · MSHA ID 0505024
    Abandoned 2019-10-08
31. Crushing Plant #1 (White Rock Pit)

    Surface metal/non-metal · Plains Aggregate Company · MSHA ID 0501379
    Abandoned 1979-01-01
32. Crushing Plant No 1

    Surface metal/non-metal · Plains Aggregate Company · MSHA ID 0501381
    Abandoned 1979-05-10
33. Del Camino Pit

    Surface metal/non-metal · Western Paving Construction Company · MSHA ID 0503627
    Abandoned 1992-07-13
34. Del Camino Sand & Gravel Mine

    Surface metal/non-metal · Ready Mixed Concrete Company · MSHA ID 0504769
    Abandoned 2005-02-22
35. Derr Pit

    Surface metal/non-metal · Broken Arrow Mining · MSHA ID 0504955
    Abandoned 2019-10-21
36. Eagle Mine

    Underground coal · Coal Operating Company · MSHA ID 0500307
    Abandoned and Sealed 1984-01-06
37. Eichner

    Surface metal/non-metal · Colorado Department Of Highways · MSHA ID 0503389
    Abandoned 1979-08-27
38. Evans

    Surface metal/non-metal · Mobile Premix Company · MSHA ID 0501007
    Abandoned 1981-06-01
39. FEIT PIT

    Surface metal/non-metal · Richco Contracting Inc · MSHA ID 0504504
    Abandoned 2000-08-23
40. Fiet Pit

    Surface metal/non-metal · Weld County Road & Bridge Department · MSHA ID 0503093
    Abandoned 1981-01-06
41. Firestone Gravel Mine

    Surface metal/non-metal · BURNCO Colorado LLC · MSHA ID 0504838
    Abandoned 2019-12-31
42. Firestone Gravel Mine

    Surface metal/non-metal · BURNCO Colorado LLC · MSHA ID 0505162
    Abandoned 2024-10-01
43. Firestone Screen & Crush Plant

    Surface metal/non-metal · Meridiam Partners · MSHA ID 0505173
    Abandoned 2024-07-10
44. Fort Lupton Pit

    Surface metal/non-metal · Pioneer Sand Company, Inc. · MSHA ID 0504894
    Abandoned 2020-02-24
45. Geisert Pit

    Surface metal/non-metal · Weld County Road & Bridge Department · MSHA ID 0504035
    Abandoned 1986-06-27
46. GOLDEN'S ANDESITE WINDSOR

    Surface metal/non-metal · Golden'S Andesite Mining Company · MSHA ID 0504479
    Abandoned 2000-01-03
47. Goodmiller 2 Pit

    Surface metal/non-metal · C&H Excavation · MSHA ID 0505203
    Abandoned 2026-02-23
48. Greeley 35th Sand and Gravel

    Surface metal/non-metal · Martin Marietta Materials · MSHA ID 0504613
    Abandoned 2024-03-04
49. GREELEY EAST MINE

    Surface metal/non-metal · Aggregate Industries West Central Region Inc · MSHA ID 0504673
    Abandoned 2007-11-01
50. Greeley Plant

    Surface metal/non-metal · Northern Colorado Constructors Inc. · MSHA ID 0505100
    Abandoned 2021-03-01
51. Greeley Portable Plant

    Surface metal/non-metal · Mobile Premix Inc · MSHA ID 0503309
    Abandoned 1979-07-03
52. Greeley West Pit

    Surface metal/non-metal · Western-Mobile Northern Inc · MSHA ID 0503261
    Abandoned 1990-03-14
53. Herbst Pit

    Surface metal/non-metal · Hall-Irwin Construction Company · MSHA ID 0504318
    Abandoned 1990-11-28
54. HERBST PIT

    Surface metal/non-metal · Hall-Irwin Construction Company · MSHA ID 0504450
    Abandoned 1998-07-28
55. Hokestra Pit

    Surface metal/non-metal · Weld County Road & Bridge Department · MSHA ID 0502910
    Abandoned 1986-01-08
56. HOLCIM Greeley Plant

    Surface metal/non-metal · Amrize West Central Inc. · MSHA ID 0504518
    Abandoned 2023-12-15
57. IDAHO CREEK GRAVEL CO

    Surface metal/non-metal · Idaho Creek Gravel Company · MSHA ID 0504478
    Abandoned 2003-11-13
58. IDAHO CREEK GRAVEL CO. INC. 11

    Surface metal/non-metal · Idaho Creek Gravel Company · MSHA ID 0504696
    Abandoned 2006-09-15
59. Imperial

    Underground coal · Imperial Coal Company · MSHA ID 0500306
    Abandoned 1972-05-10
60. Keenesburg Mine

    Surface coal · Coors Energy Company · MSHA ID 0503515
    Abandoned 1994-05-05
61. Keenesburg Project

    Surface metal/non-metal · PAS Mining Solutions, LLC · MSHA ID 0505110
    Abandoned 2020-06-03
62. Kohlberg Screen

    Surface metal/non-metal · Best-Way Paving Company · MSHA ID 0504480
    Abandoned 1992-04-29
63. Larson Pit

    Surface metal/non-metal · Siegrist Construction Company · MSHA ID 0503988
    Abandoned 1991-08-05
64. LARSON PIT

    Surface metal/non-metal · Camas Colorado Inc · MSHA ID 0504602
    Abandoned 1999-02-01
65. Lincoln Mine

    Underground coal · Coal Operating Company · MSHA ID 0500305
    Abandoned and Sealed 1982-03-29
66. Lindsey

    Surface metal/non-metal · Colorado Department Of Highways · MSHA ID 0503390
    Abandoned 1979-08-27
67. Loloff Pit

    Surface metal/non-metal · Richardson Consolidated Inc · MSHA ID 0504923
    Abandoned 2012-08-13
68. Lupton Meadows Gravel Mine

    Surface metal/non-metal · BURNCO Colorado LLC · MSHA ID 0505161
    Abandoned 2024-09-09
69. M P M Greeley 35th Avenue

    Surface metal/non-metal · Sterling Sand & Gravel Company · MSHA ID 0500926
    Abandoned 1989-03-09
70. Metso 2.4 North Weld Screen

    Surface metal/non-metal · Crossfire Aggregate Services LLC · MSHA ID 0505094
    Abandoned 2018-10-06
71. Mill Iron Pit

    Surface metal/non-metal · WW Clyde & Co. · MSHA ID 0505172
    Abandoned 2025-02-20
72. Miller

    Surface metal/non-metal · Colorado Department Of Highways · MSHA ID 0503391
    Abandoned 1979-08-27
73. Nelson Pit

    Surface metal/non-metal · Western Paving Construction Company · MSHA ID 0503260
    Abandoned 1995-08-08
74. North Weld Gravel

    Surface metal/non-metal · Bucklen Equipment Company Inc · MSHA ID 0505004
    Abandoned 2016-12-27
75. Northern Portable Plant #19

    Surface metal/non-metal · Martin Marietta Materials · MSHA ID 0504382
    Abandoned 2020-03-30
76. P C S Greeley Pit

    Surface metal/non-metal · Precision Cast Structures Inc · MSHA ID 0501014
    Abandoned 1990-12-03
77. P-11-6600 PORTABLE CONVEYOR

    Surface metal/non-metal · Colorado Department Of Transportation · MSHA ID 0503381
    Abandoned 1999-09-07
78. Perry Pit

    Surface metal/non-metal · Northern Colorado Constructors · MSHA ID 0505029
    Abandoned 2016-07-01
79. Perry Pit / Portable Wash Sand Plant

    Surface metal/non-metal · Asphalt Paving Company · MSHA ID 0504545
    Abandoned 2012-10-01
80. Peterson

    Surface metal/non-metal · Colorado Department Of Highways · MSHA ID 0503392
    Abandoned 1979-08-27
81. Philbert

    Surface metal/non-metal · So Low Transport · MSHA ID 0505197
    Abandoned 2025-03-27
82. Pierce Gravel Pit

    Surface metal/non-metal · Weld County Road & Bridge Department · MSHA ID 0504084
    Abandoned 1985-11-20
83. PIT #28

    Surface metal/non-metal · Brannan Sand & Gravel Company LLC · MSHA ID 0503538
    Abandoned 2026-07-22
84. Pit No 1

    Surface metal/non-metal · Greeley Sand & Gravel Company · MSHA ID 0500984
    Abandoned 1980-02-29
85. Platteville Pit

    Surface metal/non-metal · Ramsour Brothers Inc · MSHA ID 0503265
    Abandoned 1979-07-31
86. Portable Crusher 1

    Surface metal/non-metal · VESCO Consulting Services LLC · MSHA ID 0505022
    Abandoned 2019-01-09
87. Portable Mining

    Surface metal/non-metal · Weld County Road & Bridge Department · MSHA ID 0504386
    Abandoned 1991-11-25
88. Portable Plant #1

    Surface metal/non-metal · River Valley Rock Inc · MSHA ID 0504412
    Abandoned 1991-03-15
89. Portable Plant #1

    Surface metal/non-metal · Hall-Irwin Corporation · MSHA ID 0504516
    Abandoned 2007-10-01
90. Portable Plant 3

    Surface metal/non-metal · Laser Oilfield Services · MSHA ID 0505053
    Abandoned 2018-10-19
91. Portable Screen # 3

    Surface metal/non-metal · Weld County Public Works · MSHA ID 0504909
    Abandoned 2019-11-14
92. Portable Screen #158

    Surface metal/non-metal · Pioneer Sand Co., Inc. · MSHA ID 0504777
    Abandoned 2015-03-10
93. PORTABLE SCREEN PLANT #2

    Surface metal/non-metal · Weld County · MSHA ID 0504151
    Abandoned 2004-05-14
94. PORTABLE SCREEN PLANT RENTAL

    Surface metal/non-metal · Weld County Public Works · MSHA ID 0504604
    Abandoned 1998-08-25
95. POWER SCREEN-0504614

    Surface metal/non-metal · Bestway Concrete & Aggregates · MSHA ID 0504614
    Abandoned 2018-10-01
96. R.J. Campbell Pit #1

    Surface metal/non-metal · LID Not Available · MSHA ID 0504833
    Abandoned 2007-11-01
97. R.J. Campbell's Pit #1

    Surface metal/non-metal · Suburban Sand & Gravel · MSHA ID 0504428
    Abandoned 2010-06-22
98. RINN VALLEY RESOURCE

    Surface metal/non-metal · L.G. Everist, Inc. · MSHA ID 0504670
    Abandoned 2018-11-09
99. S & H Mine

    Surface metal/non-metal · Platte Sand & Gravel · MSHA ID 0504783
    Abandoned 2011-03-22
100. Screen Plant

     Surface metal/non-metal · Bucklen Equipment Co Inc · MSHA ID 0505070
     Abandoned 2017-11-02
101. SEC 01 GREELEY

     Surface metal/non-metal · Colorado Department Of Transportation · MSHA ID 0504177
     Abandoned 2001-04-27
102. Shipps

     Surface metal/non-metal · Colorado Department Of Highways · MSHA ID 0503393
     Abandoned 1979-08-27
103. Simpson

     Surface metal/non-metal · Colorado Department Of Highways · MSHA ID 0503394
     Abandoned 1979-08-27
104. State Board Of Land Comm

     Surface metal/non-metal · Colorado Department Of Highways · MSHA ID 0503395
     Abandoned 1979-08-27
105. Stroh Gravel Mine

     Surface metal/non-metal · John Stroh · MSHA ID 0504227
     Abandoned 1990-08-01
106. Stromquist

     Surface metal/non-metal · Western Mobile Inc · MSHA ID 0503933
     Abandoned 1991-09-05
107. TEREX WARRIOR #5

     Surface metal/non-metal · Burnco · MSHA ID 0505069
     Abandoned 2022-02-01
108. Timmerman/Wells

     Surface metal/non-metal · Wells Trucking LLC · MSHA ID 0505035
     Abandoned 2018-10-19
109. Turnpike - Wet Plant

     Surface metal/non-metal · Asphalt Specialties Co., Inc. · MSHA ID 0505044
     Abandoned 2024-10-01
110. Turnpike Pit

     Surface metal/non-metal · Turnpike Construction · MSHA ID 0502550
     Abandoned 1989-07-07
111. Van Cleave Pit

     Surface metal/non-metal · VCA Aggregates LLC · MSHA ID 0505039
     Abandoned 2021-05-10
112. VCA Screen #1

     Surface metal/non-metal · VCA Aggregates LLC · MSHA ID 0505073
     Abandoned 2017-10-25
113. WARRIOR 2100 #2

     Surface metal/non-metal · BURNCO · MSHA ID 0505057
     Abandoned 2023-01-12
114. WARRIOR POWERSCREEN 2100 0504792

     Surface metal/non-metal · BURNCO · MSHA ID 0504792
     Abandoned 2023-01-11
115. Williams Pit

     Surface metal/non-metal · C & M Aggregates Ltd · MSHA ID 0504477
     Abandoned 1996-05-22
116. Wilson

     Surface metal/non-metal · Colorado Department Of Highways · MSHA ID 0503396
     Abandoned 1979-08-27

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
• Park County 1,624
• Chaffee County 1,486
• Summit County 1,449

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.