Abandoned mines in Los Angeles County, California

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   116 22.0%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   168 31.8%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   81 15.3%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   161 30.5%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   2 0.4%

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.

1. #1 PORTABLE

   Surface metal/non-metal · No Frills Trucking · MSHA ID 0405317
   Abandoned 2005-12-31
2. A E Schmidt Company

   Surface metal/non-metal · A E Schmidt Company · MSHA ID 0404763
   Abandoned 1986-01-09
3. A-1 Grit Co

   Facility metal/non-metal · A-1 Grit Company · MSHA ID 0404963
   Abandoned 2013-09-03
4. Andrew

   Surface metal/non-metal · Curtis Tungsten · MSHA ID 0405092
   Abandoned 2017-06-27
5. Arrow Sand And Gravel Incorporated

   Surface metal/non-metal · Arrow Sand & Gravel Inc · MSHA ID 0404338
   Abandoned 1982-12-20
6. AZUSA

   Facility metal/non-metal · Robertson'S Ready Mix Ltd · MSHA ID 0403821
   Abandoned 1997-08-07
7. Azusa Quarry

   Surface metal/non-metal · L&G Portable Crushing and Materials · MSHA ID 0401696
   Abandoned 2019-12-30
8. Azusa Quarry

   Surface metal/non-metal · Greenleaf Engineering · MSHA ID 0405930
   Abandoned 2019-12-30
9. Bay Street Mill

   Facility metal/non-metal · Cyprus Industrial Minerals Company · MSHA ID 0401125
   Abandoned 1987-09-25
10. Big Horn

    Surface metal/non-metal · A T G Company · MSHA ID 0404735
    Abandoned 1985-05-21
11. Big Rock Creek

    Surface metal/non-metal · CalMat Co · MSHA ID 0405778
    Abandoned 2020-07-14
12. Big Rock Creek Plant

    Surface metal/non-metal · Premier Rock Div Of Ca Portland Cem · MSHA ID 0404042
    Abandoned 1979-10-23
13. Boulevard Plant

    Surface metal/non-metal · Calmat Company · MSHA ID 0401742
    Abandoned 1992-05-14
14. C A Rasmussen Inc Crusher Units

    Surface metal/non-metal · C A Rasmussen Inc · MSHA ID 0405722
    Abandoned 2018-03-31
15. C D Houston Sand & Gravel

    Surface metal/non-metal · C D Houston Company · MSHA ID 0405043
    Abandoned 1990-08-10
16. Calmat Plant

    Surface metal/non-metal · Conrock Company · MSHA ID 0401717
    Abandoned 1980-08-27
17. Calspar Plant

    Facility metal/non-metal · Calspar Division-Steelhead Resources Inc · MSHA ID 0404818
    Abandoned 1990-08-23
18. CASPAR MINE

    Surface metal/non-metal · Industrial Mineral Fillers Llc · MSHA ID 0405294
    Abandoned 2000-05-23
19. Castaic Brick Plant

    Surface metal/non-metal · Castaic Clay Mfg Co · MSHA ID 0400545
    Abandoned 1983-06-27
20. Chandlers Palos Verdes Sand And Gravel C

    Surface metal/non-metal · Chandler'S Palos Verdes Sand & Gravel Company · MSHA ID 0403110
    Abandoned 1985-08-13
21. Chino Plant

    Surface metal/non-metal · Higgins Brick Company · MSHA ID 0402636
    Abandoned 1980-07-08
22. Compton Plant

    Surface metal/non-metal · Atkinson Brick Company · MSHA ID 0400535
    Abandoned 1980-07-08
23. D & S Earthmovers

    Surface metal/non-metal · D & S Earthmovers Equipment Rental · MSHA ID 0404989
    Abandoned 1994-06-21
24. Dam Sand Plant

    Surface metal/non-metal · Paul Hurns Construction · MSHA ID 0404445
    Abandoned 1985-06-11
25. Davidson Brick Company

    Surface metal/non-metal · Davidson Brick Company · MSHA ID 0400550
    Abandoned 1980-07-08
26. Del Sur Ridge Quarry

    Surface metal/non-metal · Bouquet Canyon Stone Company Inc · MSHA ID 0402363
    Abandoned 2008-08-30
27. Devil'S Gate Dam Plant

    Surface metal/non-metal · Pasadena Aggregates · MSHA ID 0403214
    Abandoned 1986-03-15
28. District 9 Plant 1

    Surface metal/non-metal · Griffith Company · MSHA ID 0405588
    Abandoned 2004-04-20
29. Empire Quarry

    Surface metal/non-metal · Connolly-Pacific Company · MSHA ID 0404954
    Abandoned 2020-10-27
30. Enterprise Aggregates Corporation

    Surface metal/non-metal · Enterprise Aggregates Corp · MSHA ID 0404074
    Abandoned 1984-06-05
31. Extec 1

    Surface metal/non-metal · Hawk Stone Co · MSHA ID 0405699
    Abandoned 2009-12-17
32. Governor Mine

    Underground metal/non-metal · Herron Construction Inc · MSHA ID 0404671
    Abandoned 1990-05-01
33. Hansen Dam Aggregates

    Surface metal/non-metal · Hansen Dam Aggregates · MSHA ID 0404719
    Abandoned 1985-06-11
34. Hansen Dam Plant

    Surface metal/non-metal · Borges Rock Products Inc · MSHA ID 0404730
    Abandoned 1993-06-01
35. Hansen Dam Plant

    Surface metal/non-metal · Calmat Company · MSHA ID 0404833
    Abandoned 1993-04-01
36. Hi-Grade Mine

    Underground metal/non-metal · Hi-Grade Mining Company · MSHA ID 0404557
    Abandoned 1984-06-07
37. Hurns Products

    Surface metal/non-metal · Paul Hurns Construction · MSHA ID 0404500
    Abandoned 1983-08-10
38. INDUSTRY PLANT

    Facility metal/non-metal · Chemical Lime Company Of Arizona · MSHA ID 0400894
    Abandoned 2003-09-02
39. Kagel Cyn

    Surface metal/non-metal · O & B Equipment Incorporated · MSHA ID 0405548
    Abandoned 2006-05-03
40. Lang Station

    Surface metal/non-metal · Curtis Sand & Gravel · MSHA ID 0401950
    Abandoned 2012-10-01
41. Littlerock

    Surface metal/non-metal · Granite Construction Company · MSHA ID 0404926
    Abandoned 2020-06-04
42. Littlerock Plant

    Surface metal/non-metal · Holliday Rock Company Inc · MSHA ID 0401690
    Abandoned 2026-04-01
43. Material Yard

    Facility metal/non-metal · H & B Liston Inc · MSHA ID 0404061
    Abandoned 1979-10-04
44. Mid City Granite

    Surface metal/non-metal · Mid City Granite · MSHA ID 0405055
    Abandoned 1995-03-06
45. Mission Mineral Plant

    Facility metal/non-metal · Desert Mineral Products Corp · MSHA ID 0403364
    Abandoned 1982-03-05
46. Mobile Sand/Eaton Wash

    Surface metal/non-metal · Mobile Sand Company · MSHA ID 0405011
    Abandoned 1989-11-03
47. Onsite Krushing Co.

    Surface metal/non-metal · Onsite Krushing Co. · MSHA ID 0405772
    Abandoned 2009-01-05
48. Palmdale Disposable

    Facility metal/non-metal · Frank R Walker Jr · MSHA ID 0405238
    Abandoned 2003-03-01
49. Palmdale Sand & Gravel

    Surface metal/non-metal · Palmdale Equipment · MSHA ID 0404852
    Abandoned 1988-01-06
50. Pasadena Rock & Sand

    Surface metal/non-metal · Pasadena Rock & Sand · MSHA ID 0405041
    Abandoned 1995-06-29
51. Plant #1

    Surface metal/non-metal · Recycled Base Materials Inc · MSHA ID 0405806
    Abandoned 2010-11-19
52. Pomona Pit

    Surface metal/non-metal · Sand Pebble Suppliers Inc · MSHA ID 0404990
    Abandoned 1989-06-02
53. Portable Operation 1

    Surface metal/non-metal · Rasmussen R&R, inc. · MSHA ID 0405867
    Abandoned 2015-10-01
54. Portable Plant #2

    Surface metal/non-metal · B & B Materials Inc · MSHA ID 0405363
    Abandoned 2002-10-07
55. PORTABLE PLANT A

    Surface metal/non-metal · Diversified Materials · MSHA ID 0404997
    Abandoned 1998-11-10
56. PORTABLE PLANT A

    Surface metal/non-metal · Aman Brothers Inc · MSHA ID 0405013
    Abandoned 2000-10-06
57. PORTABLE PLANT C

    Surface metal/non-metal · Aman Brothers Inc · MSHA ID 0404958
    Abandoned 2001-04-30
58. PORTABLE PLANT C

    Surface metal/non-metal · Diversified Materials · MSHA ID 0405137
    Abandoned 2002-10-07
59. Portable Plant E

    Surface metal/non-metal · Aman Brothers Inc · MSHA ID 0405168
    Abandoned 1993-03-19
60. Precision Products

    Surface metal/non-metal · Precision Lumber Company · MSHA ID 0404467
    Abandoned 1986-09-16
61. Quarry Division

    Surface metal/non-metal · Three D Service Company · MSHA ID 0404779
    Abandoned 1991-01-10
62. Rasmussen Soledad Rock Quarry

    Surface metal/non-metal · Rasmussen R&R Inc. · MSHA ID 0400247
    Abandoned 2018-07-19
63. Red Rover Mine

    Underground metal/non-metal · Red Rover Mine 2, LLC · MSHA ID 0405837
    Abandoned 2012-08-31
64. Redlands - Wet Plant

    Surface metal/non-metal · Transamerican Soil Service · MSHA ID 0405507
    Abandoned 2011-08-01
65. Redlands Dry Plant

    Surface metal/non-metal · Trans American Soil Services Inc. · MSHA ID 0405606
    Abandoned 2004-09-21
66. SAN GABRIEL ROCK

    Surface metal/non-metal · San Gabriel Rock Inc · MSHA ID 0404733
    Abandoned 2002-02-15
67. Soledad Canyon

    Surface metal/non-metal · Curtis Sand & Gravel · MSHA ID 0401746
    Abandoned 1991-08-01
68. SOUTHWEST WEAR PARTS CO., INC.

    Facility metal/non-metal · SOUTHWEST WEAR PARTS CO., INC · MSHA ID 0405921
    Abandoned 2022-02-04
69. Sun Valley Plant

    Surface metal/non-metal · CalMat Co · MSHA ID 0401736
    Abandoned 2020-07-14
70. Sun Valley Plant

    Surface metal/non-metal · Livingston-Graham · MSHA ID 0401839
    Abandoned 1983-08-11
71. SUNBURST DECORATIVE ROCK INC.

    Facility metal/non-metal · Sunburst Decorative Rock Inc · MSHA ID 0404978
    Abandoned 2007-01-01
72. Sunburst Rock

    Surface metal/non-metal · Sunburst Decorative Rock Inc · MSHA ID 0404494
    Abandoned 1983-03-16
73. Sweetwater Aggregates

    Surface metal/non-metal · Sweetwater Aggregates · MSHA ID 0404741
    Abandoned 1992-07-02
74. TRP-Soledad Canyon Plant

    Surface metal/non-metal · Triangle Rock Products · MSHA ID 0401889
    Abandoned 2010-11-05
75. Upland Plant

    Surface metal/non-metal · Holliday Rock Company · MSHA ID 0402828
    Abandoned 2010-10-12
76. URP Portable 1

    Surface metal/non-metal · United Rock Products · MSHA ID 0405842
    Abandoned 2012-11-02
77. West Valley Base Materials Pit & Mill

    Surface metal/non-metal · West Valley Base Materials · MSHA ID 0404238
    Abandoned 1985-02-22
78. Western EnvironmentalContracting

    Surface metal/non-metal · CALMAT Co · MSHA ID 0405485
    Abandoned 2001-12-31
79. WHITEMAN AGGREGATES

    Surface metal/non-metal · Whiteman Aggregates · MSHA ID 0405019
    Abandoned 2001-09-24

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

• San Bernardino County 14,976
• Inyo County 11,475
• Kern County 4,879
• Riverside County 3,227
• Mono County 2,946
• Siskiyou County 2,362
• Imperial County 1,232
• Mariposa County 1,079
• Tuolumne County 948
• San Diego County 901
• Calaveras County 840
• Shasta County 832

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.