Abandoned mines in San Diego County, California

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   258 28.6%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   248 27.5%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   152 16.9%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   236 26.2%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   7 0.8%

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. # 3 Portable

   Surface metal/non-metal · Rock Structures Construction · MSHA ID 0405910
   Abandoned 2023-06-06
2. A-A Sand

   Surface metal/non-metal · A-A Sand · MSHA ID 0404637
   Abandoned 1984-01-26
3. ACORN SAND & MATERIALS

   Surface metal/non-metal · Valley Material & Supply Company Inc · MSHA ID 0405181
   Abandoned 1999-06-03
4. Am Sod

   Surface metal/non-metal · Hofer & Sons · MSHA ID 0404946
   Abandoned 1993-04-29
5. Ashland Granite Pit

   Surface metal/non-metal · Ashland Granite Corp · MSHA ID 0404629
   Abandoned 1996-02-15
6. Ben Hur Mine

   Underground metal/non-metal · Ben Hur · MSHA ID 0402456
   Abandoned 1982-08-16
7. Bol Pit

   Surface metal/non-metal · Bol Land Development Company · MSHA ID 0404117
   Abandoned 1979-06-26
8. Border Pit

   Surface metal/non-metal · Nelson & Sloan · MSHA ID 0404081
   Abandoned 1988-02-10
9. Boseker Ranch Channel Rehabilitation Pro

   Surface metal/non-metal · Burl Stolworthy Flood Control Maintenance · MSHA ID 0405198
   Abandoned 1996-03-04
10. California Mine

    Underground metal/non-metal · Dean Webb · MSHA ID 0405508
    Abandoned 2002-03-26
11. California Sand And Gravel

    Surface metal/non-metal · California Sand & Gravel · MSHA ID 0404840
    Abandoned 1992-01-01
12. Campo Materials Company

    Surface metal/non-metal · Campo Materials Company · MSHA ID 0405015
    Abandoned 2019-04-01
13. Carmel Valley Sand Company Incorporated

    Surface metal/non-metal · Carmel Valley Sand Company Inc · MSHA ID 0405205
    Abandoned 1995-08-28
14. CARMELITA MINE

    Underground metal/non-metal · San Diego Mining Company · MSHA ID 0405347
    Abandoned 2017-04-11
15. Carroll Canyon Plant

    Surface metal/non-metal · CalMat Co · MSHA ID 0401932
    Abandoned 2022-10-27
16. Carroll Canyon Rock Plant

    Surface metal/non-metal · Hanson Aggregates Pacific Southwest Inc · MSHA ID 0401790
    Abandoned 2016-10-15
17. Chula Vista Mine

    Surface metal/non-metal · Tony'S Tractor Work Inc · MSHA ID 0405004
    Abandoned 1989-08-18
18. CHULA VISTA PROCESSING

    Surface metal/non-metal · Hanson Aggregates Pacific Southwest Inc · MSHA ID 0402978
    Abandoned 2007-11-16
19. COAST SAND CO INC

    Surface metal/non-metal · Coast Sand Company Inc · MSHA ID 0401731
    Abandoned 1997-05-13
20. Cryo Genie Mine

    Surface metal/non-metal · Gochenour's Minerals & Mining · MSHA ID 0405509
    Abandoned 2019-07-01
21. D B Mine

    Underground metal/non-metal · D B Mine · MSHA ID 0404567
    Abandoned 1982-08-16
22. Dave Martin Prospect Granite Pit

    Surface metal/non-metal · Dave Martin Supplies Inc · MSHA ID 0402704
    Abandoned 1979-11-27
23. Denton Sand Plant

    Surface metal/non-metal · Dentons American Sand Inc · MSHA ID 0401749
    Abandoned 1979-09-14
24. Dirt Pit

    Surface metal/non-metal · Hofer & Sons · MSHA ID 0405187
    Abandoned 1993-04-29
25. Dyche Valley Mine

    Underground metal/non-metal · Ernist Engel & Associates · MSHA ID 0403167
    Abandoned 1979-01-30
26. E S K ENTERPRISES LLC

    Surface metal/non-metal · E S K ENTERPRISES LLC · MSHA ID 0405676
    Abandoned 2006-03-02
27. Enniss Lakeside Plant

    Surface metal/non-metal · Enniss Inc · MSHA ID 0404910
    Abandoned 2019-04-01
28. Esmeralda Mine

    Underground metal/non-metal · RPL Mining Limited LLC · MSHA ID 0405836
    Abandoned 2014-05-28
29. Gold Sugar-Cold Beef Mine

    Underground metal/non-metal · Gold Sugar-Cold Beef Mine · MSHA ID 0404562
    Abandoned 1988-08-05
30. Golden Chariot Mine

    Underground metal/non-metal · Golden Chariot Mining · MSHA ID 0404576
    Abandoned 1985-08-26
31. Gordon Sand And Gravel Incorporated

    Surface metal/non-metal · Gordon Sand & Gravel Inc · MSHA ID 0405023
    Abandoned 1992-03-23
32. Harmony Quarry

    Surface metal/non-metal · H G Fenton Material Company · MSHA ID 0404630
    Abandoned 1994-03-22
33. HERCULES MINE

    Underground metal/non-metal · San Diego Mining Company · MSHA ID 0405315
    Abandoned 1997-11-07
34. Hester Granite Pit

    Surface metal/non-metal · Dave Martin Supplies Inc · MSHA ID 0404934
    Abandoned 1989-07-14
35. Hi-Grade Materials Littlerock Quarry

    Surface metal/non-metal · Hi-Grade Materials · MSHA ID 0404082
    Abandoned 1980-09-03
36. HIMALAYA

    Underground metal/non-metal · Lithaurum Llc · MSHA ID 0405054
    Abandoned 2002-01-11
37. Himalaya Mine 3rd Claim

    Underground metal/non-metal · Lithaurum LLC · MSHA ID 0405340
    Abandoned 2003-10-21
38. Hot Spot Mines & Mill

    Facility metal/non-metal · Hot Spot Mining · MSHA ID 0404575
    Abandoned 1982-08-16
39. JAMACHA QUARRY

    Surface metal/non-metal · Superior Ready Mix Concrete L.P. · MSHA ID 0400135
    Abandoned 2025-12-01
40. Keys Canyon Plant

    Surface metal/non-metal · North County Sand & Gravel Inc · MSHA ID 0404839
    Abandoned 1987-11-21
41. Klemm Ranch

    Surface metal/non-metal · Klemm Ranch · MSHA ID 0405239
    Abandoned 1994-07-08
42. Kolberg-271-1

    Surface metal/non-metal · Perrault Equipment Rentals · MSHA ID 0405510
    Abandoned 2002-01-20
43. L E Morrison Sand Plant

    Surface metal/non-metal · L E & Jean Morrison · MSHA ID 0404859
    Abandoned 1992-06-30
44. La Posta Sand Plant

    Surface metal/non-metal · Imperial Cement & Tom Dyke · MSHA ID 0401965
    Abandoned 1989-09-01
45. La Posta Sand Plant

    Surface metal/non-metal · Superior Ready Mix Concrete L P · MSHA ID 0404947
    Abandoned 1992-05-21
46. Lakeside Plant

    Surface metal/non-metal · Calmat Company · MSHA ID 0402681
    Abandoned 1994-03-23
47. Lakeside Sand & Processing

    Surface metal/non-metal · Hanson Aggregates Pacific Southwest Inc · MSHA ID 0401989
    Abandoned 2016-12-07
48. Lakeside West Plant

    Surface metal/non-metal · Dave Martin Supplies Inc · MSHA ID 0402686
    Abandoned 1979-03-08
49. Lavato Rainbow Mine

    Surface metal/non-metal · Lavato Rock · MSHA ID 0404995
    Abandoned 1989-03-24
50. LOHRER

    Surface metal/non-metal · Mesa Minerals · MSHA ID 0405324
    Abandoned 1998-02-13
51. LYNCH PIT

    Surface metal/non-metal · Robert L Lynch Trucking · MSHA ID 0405176
    Abandoned 1997-05-12
52. Marron Brothers Incorporated

    Surface metal/non-metal · Marron Brothers Inc · MSHA ID 0404516
    Abandoned 1991-03-28
53. Mine #1

    Surface metal/non-metal · Superior Ready Mix Concrete L P · MSHA ID 0404843
    Abandoned 2015-10-03
54. Miramar Recycle

    Surface metal/non-metal · Martin Marietta San Diego Aggregates, LLC · MSHA ID 0402911
    Abandoned 2023-12-15
55. Mission Valley Plant

    Surface metal/non-metal · H G Fenton Material Company · MSHA ID 0401789
    Abandoned 1991-01-09
56. Mission Valley Plant

    Surface metal/non-metal · CalMat Co · MSHA ID 0401933
    Abandoned 2011-08-08
57. Mountain Lily Mine

    Underground metal/non-metal · RPL Mining Limited LLC · MSHA ID 0405900
    Abandoned 2019-01-01
58. Murphy Canyon Crusher Plant

    Surface metal/non-metal · Daley Corp · MSHA ID 0401748
    Abandoned 1988-02-25
59. Murray Canyon Plant Or Murray Canyon

    Surface metal/non-metal · H G Fenton Material Company · MSHA ID 0401791
    Abandoned 1985-05-16
60. Muzzle Loader

    Underground metal/non-metal · River Park Mining · MSHA ID 0404571
    Abandoned 1982-08-16
61. National Quarries

    Surface metal/non-metal · Superior Ready Mix Concrete L.P. · MSHA ID 0400204
    Abandoned 2015-12-08
62. NORTH TWIN OAKS VALLEY QUARRY

    Surface metal/non-metal · South Coast Materials Company · MSHA ID 0404621
    Abandoned 1997-05-15
63. Oceanside Plant

    Surface metal/non-metal · U S Silica Company · MSHA ID 0402304
    Abandoned 1991-10-04
64. OCEANSIDE-CARLSBAD QUARRY

    Surface metal/non-metal · South Coast Materials Company · MSHA ID 0400239
    Abandoned 1999-02-09
65. Old Noble Mines

    Facility metal/non-metal · Old Noble Mine · MSHA ID 0403708
    Abandoned 1982-04-22
66. Padre-Pankey Sand & Gravel

    Surface metal/non-metal · Padre-Pankey Sand & Gravel · MSHA ID 0404659
    Abandoned 1987-12-17
67. Pala Plant

    Surface metal/non-metal · Calmat Company · MSHA ID 0401934
    Abandoned 2004-12-03
68. Pala Plant

    Surface metal/non-metal · J W Sand & Materials Inc · MSHA ID 0404841
    Abandoned 1992-10-01
69. Pala Sand Plant

    Surface metal/non-metal · Hanson Aggregates Pacific Southwest Inc · MSHA ID 0401793
    Abandoned 2005-10-08
70. PAUMA VALLEY MINE

    Surface metal/non-metal · Colwell Equipment · MSHA ID 0405226
    Abandoned 2000-09-25
71. PAUMA VALLEY PORTABLE PLANT

    Surface metal/non-metal · A Julian Trucking · MSHA ID 0405192
    Abandoned 2000-09-25
72. Plant # 1

    Surface metal/non-metal · DNS Aggregates, Inc · MSHA ID 0405796
    Abandoned 2018-12-01
73. Portable

    Surface metal/non-metal · Lovelady Trucking and Material Inc · MSHA ID 0405786
    Abandoned 2010-11-10
74. Portable Crusher #1

    Surface metal/non-metal · Chilcote Inc · MSHA ID 0404890
    Abandoned 1991-03-28
75. Portable Crusher #2

    Surface metal/non-metal · Chilcote Inc · MSHA ID 0404998
    Abandoned 1992-08-14
76. Portable Crusher #4

    Surface metal/non-metal · Chilcote Inc · MSHA ID 0405052
    Abandoned 1991-10-07
77. Portable Operation

    Surface metal/non-metal · DS, Inc. · MSHA ID 0405707
    Abandoned 2023-06-30
78. PORTABLE PLANT "B"

    Facility metal/non-metal · Aman Brothers Inc · MSHA ID 0404964
    Abandoned 2000-12-18
79. Portable Plant #1

    Surface metal/non-metal · TC Const. Co Inc · MSHA ID 0405803
    Abandoned 2011-11-30
80. Portable Plant #3

    Surface metal/non-metal · Chilcote Inc · MSHA ID 0405020
    Abandoned 1993-05-24
81. Portable Plant A

    Surface metal/non-metal · Silberberger Engineers Inc · MSHA ID 0405255
    Abandoned 1995-12-26
82. PORTABLE PLANT A-33.1

    Surface metal/non-metal · Roy E Ladd Inc · MSHA ID 0405254
    Abandoned 1997-05-12
83. Portable Plant C

    Surface metal/non-metal · Romero General Construction Corp · MSHA ID 0405712
    Abandoned 2008-12-12
84. Portable Plant F

    Surface metal/non-metal · Romero General Construction · MSHA ID 0405754
    Abandoned 2009-01-05
85. Portable Unit #1

    Surface metal/non-metal · Tony'S Tractor Work Inc · MSHA ID 0405001
    Abandoned 1991-10-04
86. Poway Plant

    Surface metal/non-metal · Granite Construction Company · MSHA ID 0404480
    Abandoned 2011-04-01
87. Ranch Materials

    Surface metal/non-metal · Ranch Materials · MSHA ID 0404861
    Abandoned 1988-08-29
88. RANCHO CIELO ROCK PLANT

    Surface metal/non-metal · Granite Construction Company · MSHA ID 0405279
    Abandoned 1998-07-13
89. RCP Sand Plant

    Surface metal/non-metal · RCP Block & Brick Inc · MSHA ID 0402077
    Abandoned 2014-03-28
90. Reliable Crusher

    Surface metal/non-metal · C W Poss Inc · MSHA ID 0405118
    Abandoned 1993-05-24
91. Rich & Whillock Incorporated

    Surface metal/non-metal · Rich & Whillock Inc · MSHA ID 0404631
    Abandoned 1984-08-07
92. Rodriguez Borrow Pit

    Surface metal/non-metal · Borrego Sand & Rock Inc · MSHA ID 0405681
    Abandoned 2014-06-13
93. S.D. PORTABLE PLANT #2

    Surface metal/non-metal · Sd Engineering Inc · MSHA ID 0405148
    Abandoned 1999-10-21
94. San Pasqual Pit

    Surface metal/non-metal · Sorrento Sand Company Inc · MSHA ID 0403837
    Abandoned 1979-09-11
95. San Pasqual Quarry

    Surface metal/non-metal · Superior Ready Mix Concrete L.P. · MSHA ID 0405717
    Abandoned 2020-04-20
96. SD PORTABLE PLANT #1

    Surface metal/non-metal · Sd Engineering Inc · MSHA ID 0404858
    Abandoned 1998-07-29
97. Slaughterhouse Aggregates

    Surface metal/non-metal · Martin Marietta San Diego Aggregates, LLC · MSHA ID 0402251
    Abandoned 2026-08-05
98. Sloan Canyon Plant

    Surface metal/non-metal · Calmat Company · MSHA ID 0403027
    Abandoned 2003-12-12
99. Sorrento Pit

    Surface metal/non-metal · Sorrento Ready Mix Inc · MSHA ID 0401952
    Abandoned 1991-12-31
100. Srmp

     Surface metal/non-metal · Sorrento Ready Mix Inc · MSHA ID 0405010
     Abandoned 1990-03-12
101. Stewart Lithia Mine

     Underground metal/non-metal · Millennium Inc · MSHA ID 0404486
     Abandoned 1992-07-02
102. Sycamore Landfill

     Surface metal/non-metal · LB3 Enterprises Inc · MSHA ID 0405924
     Abandoned 2019-03-29
103. Temecula Sand

     Surface metal/non-metal · Perrault Corporation · MSHA ID 0405705
     Abandoned 2007-01-17
104. TOURMALINE KING MINE

     Underground metal/non-metal · San Diego Mining Corp · MSHA ID 0405573
     Abandoned 2024-09-09
105. TOURMALINE QUEEN MINE

     Underground metal/non-metal · San Diego Mining Company · MSHA ID 0405466
     Abandoned 2001-05-03
106. Twin Oaks Pit

     Surface metal/non-metal · Twin Oaks Engineering Inc · MSHA ID 0403849
     Abandoned 1983-07-21
107. UNIVERSITY - SAN MARCOS QUARRY

     Surface metal/non-metal · Hanson Aggregates Pacific Southwest Inc · MSHA ID 0404894
     Abandoned 2008-03-10
108. Valley Materials

     Surface metal/non-metal · Valley Materials · MSHA ID 0404842
     Abandoned 1987-04-20
109. Valley Materials

     Surface metal/non-metal · Valley Materials · MSHA ID 0404844
     Abandoned 1987-02-18
110. Valley Materials

     Surface metal/non-metal · Valley Materials · MSHA ID 0404983
     Abandoned 1989-08-30
111. VISTA SAND WASHING PLANT

     Surface metal/non-metal · Superior Ready Mix Concrete L P · MSHA ID 0404334
     Abandoned 2000-09-25
112. Vulcan Poway

     Surface metal/non-metal · Perrault Corporation · MSHA ID 0405706
     Abandoned 2008-02-12
113. Western Salt Company Plant

     Surface metal/non-metal · Western Salt Company · MSHA ID 0401600
     Abandoned 1982-05-21
114. Willow Springs Mine

     Surface metal/non-metal · Superior Ready Mix Concrete L P · MSHA ID 0405490
     Abandoned 2008-01-01
115. Woodward Sand Company Incorporated

     Surface metal/non-metal · Woodward Sand Company Inc · MSHA ID 0402003
     Abandoned 1991-11-01
116. WYROC PLANT

     Surface metal/non-metal · Wyroc Inc · MSHA ID 0404199
     Abandoned 2000-09-25

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

• San 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
• Calaveras County 840
• Shasta County 832
• Trinity County 685

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.