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MSHA mine register by county

Mines in San Diego County, California

San Diego County, California has 130 mines on MSHA's register: 12 active, 1 intermittent, 116 abandoned. 5 miners have died and 978 accidents have been reported at these mines between 1983 and 2025. Inspectors have issued 2,871 citations.

Every mine MSHA has registered in San Diego County, working or not, with the accident, fatality and citation record each one carries on this site. Active mines are listed first, then the rest by the weight of their record.

Abandoned and historical mine features in San Diego County →

Mines on register
130
Active
12
Fatalities on record
5
Citations issued
2,871
17 underground · 110 surface · 3 facilities 0 coal · 130 metal and non-metal 1 intermittent 116 abandoned 978 reported accidents, 1983–2025
Local economic context
ⓘ County figures come from the US Census Bureau's American Community Survey, 5-year pooled estimates, so the 2023 vintage covers 2019 through 2023. The Census category is 'mining, quarrying, and oil and gas extraction', which is broader than MSHA jurisdiction and includes oil and gas workers no mine employs. These figures describe the surrounding county, not this mine, and are not a factor in any specific incident.
San Diego County, California · Population 3,282,782
0.0%
Mining share of county employment
$102,285
Median household income
Source: US Census Bureau, American Community Survey 2023 5-year estimates.
On the map 
Loading map…
MSHA-registered mine, any status

Mines plot only where MSHA holds a surveyed coordinate for the site; mines the agency locates to a town, county or state centroid are in the counts and the list above but not drawn. Click a point for the mine's status and record.

Operators with the most mines herecurrent operator of record
Operator Mines Active Fatalities
Superior Ready Mix Concrete L.P. 9 2 1
Calmat Company 5 1 2
Hanson Aggregates Pacific Southwest Inc 5 0 1
Chilcote Inc 4 0 0
Martin Marietta San Diego Aggregates, LLC 4 2 0
Dave Martin Supplies Inc 3 0 0
H G Fenton Material Company 3 0 0
Valley Materials 3 0 0
South Coast Materials Company 2 0 1
Granite Construction Company 2 0 0
Mines in San Diego County130 on register
  1. Chula Vista Quarry
    Surface metal/non-metal · CalMat Co · MSHA ID 0404080
    Active
  2. MISSION GORGE PLANT
    Surface metal/non-metal · Superior Ready Mix Concrete L P · MSHA ID 0400089
    Active
  3. El Cajon Quarry
    Surface metal/non-metal · Robertson's Ready Mix Ltd · MSHA ID 0400133
    Active
  4. LAKESIDE - VIGILANTE AGGREGATES
    Surface metal/non-metal · Martin Marietta San Diego Aggregates, LLC · MSHA ID 0402685
    Active
  5. Santee Aggregates
    Surface metal/non-metal · Martin Marietta San Diego Aggregates, LLC · MSHA ID 0405564
    Active
  6. Superior - Twin Oaks
    Surface metal/non-metal · Superior Ready Mix Concrete L.P. · MSHA ID 0405514
    Active
  7. Jerry Brown
    Surface metal/non-metal · Runts Trucking Inc. · MSHA ID 0405710
    Active
  8. ROSEMARY'S MOUNTAIN QUARRY
    Surface metal/non-metal · HORIZON HILL MATERIALS, LLC · MSHA ID 0405683
    Active
  9. EAST COUNTY SAND MINE
    Surface metal/non-metal · East County Sand, LLC · MSHA ID 0405927
    Active
  10. West Coast Rock and Sand
    Surface metal/non-metal · West Coast Rock and Sand · MSHA ID 0405440
    Active
  11. Oceanview Mine
    Underground metal/non-metal · Ocean View Mines LLC · MSHA ID 0405575
    Active
  12. Turvey's Granite Pit
    Surface metal/non-metal · Mark R. Turvey Equipment Rental Inc. · MSHA ID 0405885
    Active
  13. Mission Valley Plant
    Surface metal/non-metal · CalMat Co · MSHA ID 0401933
    Abandoned
  14. UNIVERSITY - SAN MARCOS QUARRY
    Surface metal/non-metal · Hanson Aggregates Pacific Southwest Inc · MSHA ID 0404894
    Abandoned
  15. Carroll Canyon Rock Plant
    Surface metal/non-metal · Hanson Aggregates Pacific Southwest Inc · MSHA ID 0401790
    Abandoned
  16. National Quarries
    Surface metal/non-metal · Superior Ready Mix Concrete L.P. · MSHA ID 0400204
    Abandoned
  17. OCEANSIDE-CARLSBAD QUARRY
    Surface metal/non-metal · South Coast Materials Company · MSHA ID 0400239
    Abandoned
  18. Mine #1
    Surface metal/non-metal · Superior Ready Mix Concrete L P · MSHA ID 0404843
    Abandoned
  19. Oceanside Plant
    Surface metal/non-metal · U S Silica Company · MSHA ID 0402304
    Abandoned
  20. Carroll Canyon Plant
    Surface metal/non-metal · CalMat Co · MSHA ID 0401932
    Abandoned
  21. Mission Valley Plant
    Surface metal/non-metal · H G Fenton Material Company · MSHA ID 0401789
    Abandoned
  22. Pala Plant
    Surface metal/non-metal · Calmat Company · MSHA ID 0401934
    Abandoned
  23. CHULA VISTA PROCESSING
    Surface metal/non-metal · Hanson Aggregates Pacific Southwest Inc · MSHA ID 0402978
    Abandoned
  24. Slaughterhouse Aggregates
    Surface metal/non-metal · Martin Marietta San Diego Aggregates, LLC · MSHA ID 0402251
    Abandoned
  25. JAMACHA QUARRY
    Surface metal/non-metal · Superior Ready Mix Concrete L.P. · MSHA ID 0400135
    Abandoned
  26. WYROC PLANT
    Surface metal/non-metal · Wyroc Inc · MSHA ID 0404199
    Abandoned
  27. Pala Sand Plant
    Surface metal/non-metal · Hanson Aggregates Pacific Southwest Inc · MSHA ID 0401793
    Abandoned
  28. Enniss Lakeside Plant
    Surface metal/non-metal · Enniss Inc · MSHA ID 0404910
    Abandoned
  29. RCP Sand Plant
    Surface metal/non-metal · RCP Block & Brick Inc · MSHA ID 0402077
    Abandoned
  30. San Pasqual Quarry
    Surface metal/non-metal · Superior Ready Mix Concrete L.P. · MSHA ID 0405717
    Abandoned
  31. Sloan Canyon Plant
    Surface metal/non-metal · Calmat Company · MSHA ID 0403027
    Abandoned
  32. Miramar Recycle
    Surface metal/non-metal · Martin Marietta San Diego Aggregates, LLC · MSHA ID 0402911
    Abandoned
  33. Poway Plant
    Surface metal/non-metal · Granite Construction Company · MSHA ID 0404480
    Abandoned
  34. Campo Materials Company
    Surface metal/non-metal · Campo Materials Company · MSHA ID 0405015
    Abandoned
  35. Lakeside Sand & Processing
    Surface metal/non-metal · Hanson Aggregates Pacific Southwest Inc · MSHA ID 0401989
    Abandoned
  36. Sorrento Pit
    Surface metal/non-metal · Sorrento Ready Mix Inc · MSHA ID 0401952
    Abandoned
  37. Harmony Quarry
    Surface metal/non-metal · H G Fenton Material Company · MSHA ID 0404630
    Abandoned
  38. Lakeside Plant
    Surface metal/non-metal · Calmat Company · MSHA ID 0402681
    Abandoned
  39. Portable Operation
    Surface metal/non-metal · DS, Inc. · MSHA ID 0405707
    Abandoned
  40. Plant # 1
    Surface metal/non-metal · DNS Aggregates, Inc · MSHA ID 0405796
    Abandoned
  41. COAST SAND CO INC
    Surface metal/non-metal · Coast Sand Company Inc · MSHA ID 0401731
    Abandoned
  42. Marron Brothers Incorporated
    Surface metal/non-metal · Marron Brothers Inc · MSHA ID 0404516
    Abandoned
  43. Portable Crusher #1
    Surface metal/non-metal · Chilcote Inc · MSHA ID 0404890
    Abandoned
  44. ACORN SAND & MATERIALS
    Surface metal/non-metal · Valley Material & Supply Company Inc · MSHA ID 0405181
    Abandoned
  45. Murray Canyon Plant Or Murray Canyon
    Surface metal/non-metal · H G Fenton Material Company · MSHA ID 0401791
    Abandoned
  46. Portable Plant #3
    Surface metal/non-metal · Chilcote Inc · MSHA ID 0405020
    Abandoned
  47. Willow Springs Mine
    Surface metal/non-metal · Superior Ready Mix Concrete L P · MSHA ID 0405490
    Abandoned
  48. Rodriguez Borrow Pit
    Surface metal/non-metal · Borrego Sand & Rock Inc · MSHA ID 0405681
    Abandoned
  49. Portable Plant C
    Surface metal/non-metal · Romero General Construction Corp · MSHA ID 0405712
    Abandoned
  50. Ashland Granite Pit
    Surface metal/non-metal · Ashland Granite Corp · MSHA ID 0404629
    Abandoned
  51. California Sand And Gravel
    Surface metal/non-metal · California Sand & Gravel · MSHA ID 0404840
    Abandoned
  52. Stewart Lithia Mine
    Underground metal/non-metal · Millennium Inc · MSHA ID 0404486
    Abandoned
  53. VISTA SAND WASHING PLANT
    Surface metal/non-metal · Superior Ready Mix Concrete L P · MSHA ID 0404334
    Abandoned
  54. Fisher Industries Plant 27
    Surface metal/non-metal · Fisher Sand & Gravel Company · MSHA ID 3901396
    Temporarily Idled
  55. Cryo Genie Mine
    Surface metal/non-metal · Gochenour's Minerals & Mining · MSHA ID 0405509
    Abandoned
  56. Am Sod
    Surface metal/non-metal · Hofer & Sons · MSHA ID 0404946
    Abandoned
  57. La Posta Sand Plant
    Surface metal/non-metal · Superior Ready Mix Concrete L P · MSHA ID 0404947
    Abandoned
  58. Pala Plant
    Surface metal/non-metal · J W Sand & Materials Inc · MSHA ID 0404841
    Abandoned
  59. Portable Crusher #2
    Surface metal/non-metal · Chilcote Inc · MSHA ID 0404998
    Abandoned
  60. Sycamore Landfill
    Surface metal/non-metal · LB3 Enterprises Inc · MSHA ID 0405924
    Abandoned
  61. Woodward Sand Company Incorporated
    Surface metal/non-metal · Woodward Sand Company Inc · MSHA ID 0402003
    Abandoned
  62. HIMALAYA
    Underground metal/non-metal · Lithaurum Llc · MSHA ID 0405054
    Abandoned
  63. Poway Aggregates
    Surface metal/non-metal · L&G Portable Crushing and Materials · MSHA ID 0405991
    Intermittent
  64. TOURMALINE KING MINE
    Underground metal/non-metal · San Diego Mining Corp · MSHA ID 0405573
    Abandoned
  65. Kolberg-271-1
    Surface metal/non-metal · Perrault Equipment Rentals · MSHA ID 0405510
    Abandoned
  66. Mountain Lily Mine
    Underground metal/non-metal · RPL Mining Limited LLC · MSHA ID 0405900
    Abandoned
  67. # 3 Portable
    Surface metal/non-metal · Rock Structures Construction · MSHA ID 0405910
    Abandoned
  68. Portable Plant #1
    Surface metal/non-metal · TC Const. Co Inc · MSHA ID 0405803
    Abandoned
  69. Portable Plant F
    Surface metal/non-metal · Romero General Construction · MSHA ID 0405754
    Abandoned
  70. CARMELITA MINE
    Underground metal/non-metal · San Diego Mining Company · MSHA ID 0405347
    Abandoned
  71. Portable
    Surface metal/non-metal · Lovelady Trucking and Material Inc · MSHA ID 0405786
    Abandoned
  72. A-A Sand
    Surface metal/non-metal · A-A Sand · MSHA ID 0404637
    Abandoned
  73. Ben Hur Mine
    Underground metal/non-metal · Ben Hur · MSHA ID 0402456
    Abandoned
  74. Bol Pit
    Surface metal/non-metal · Bol Land Development Company · MSHA ID 0404117
    Abandoned
  75. Border Pit
    Surface metal/non-metal · Nelson & Sloan · MSHA ID 0404081
    Abandoned
  76. Boseker Ranch Channel Rehabilitation Pro
    Surface metal/non-metal · Burl Stolworthy Flood Control Maintenance · MSHA ID 0405198
    Abandoned
  77. California Mine
    Underground metal/non-metal · Dean Webb · MSHA ID 0405508
    Abandoned
  78. Carmel Valley Sand Company Incorporated
    Surface metal/non-metal · Carmel Valley Sand Company Inc · MSHA ID 0405205
    Abandoned
  79. Chula Vista Mine
    Surface metal/non-metal · Tony'S Tractor Work Inc · MSHA ID 0405004
    Abandoned
  80. D B Mine
    Underground metal/non-metal · D B Mine · MSHA ID 0404567
    Abandoned
  81. Dave Martin Prospect Granite Pit
    Surface metal/non-metal · Dave Martin Supplies Inc · MSHA ID 0402704
    Abandoned
  82. Denton Sand Plant
    Surface metal/non-metal · Dentons American Sand Inc · MSHA ID 0401749
    Abandoned
  83. Dirt Pit
    Surface metal/non-metal · Hofer & Sons · MSHA ID 0405187
    Abandoned
  84. Dyche Valley Mine
    Underground metal/non-metal · Ernist Engel & Associates · MSHA ID 0403167
    Abandoned
  85. E S K ENTERPRISES LLC
    Surface metal/non-metal · E S K ENTERPRISES LLC · MSHA ID 0405676
    Abandoned
  86. Esmeralda Mine
    Underground metal/non-metal · RPL Mining Limited LLC · MSHA ID 0405836
    Abandoned
  87. Gold Sugar-Cold Beef Mine
    Underground metal/non-metal · Gold Sugar-Cold Beef Mine · MSHA ID 0404562
    Abandoned
  88. Golden Chariot Mine
    Underground metal/non-metal · Golden Chariot Mining · MSHA ID 0404576
    Abandoned
  89. Gordon Sand And Gravel Incorporated
    Surface metal/non-metal · Gordon Sand & Gravel Inc · MSHA ID 0405023
    Abandoned
  90. HERCULES MINE
    Underground metal/non-metal · San Diego Mining Company · MSHA ID 0405315
    Abandoned
  91. Hester Granite Pit
    Surface metal/non-metal · Dave Martin Supplies Inc · MSHA ID 0404934
    Abandoned
  92. Hi-Grade Materials Littlerock Quarry
    Surface metal/non-metal · Hi-Grade Materials · MSHA ID 0404082
    Abandoned
  93. Himalaya Mine 3rd Claim
    Underground metal/non-metal · Lithaurum LLC · MSHA ID 0405340
    Abandoned
  94. Hot Spot Mines & Mill
    Facility metal/non-metal · Hot Spot Mining · MSHA ID 0404575
    Abandoned
  95. Keys Canyon Plant
    Surface metal/non-metal · North County Sand & Gravel Inc · MSHA ID 0404839
    Abandoned
  96. Klemm Ranch
    Surface metal/non-metal · Klemm Ranch · MSHA ID 0405239
    Abandoned
  97. L E Morrison Sand Plant
    Surface metal/non-metal · L E & Jean Morrison · MSHA ID 0404859
    Abandoned
  98. La Posta Sand Plant
    Surface metal/non-metal · Imperial Cement & Tom Dyke · MSHA ID 0401965
    Abandoned
  99. Lakeside West Plant
    Surface metal/non-metal · Dave Martin Supplies Inc · MSHA ID 0402686
    Abandoned
  100. Lavato Rainbow Mine
    Surface metal/non-metal · Lavato Rock · MSHA ID 0404995
    Abandoned
  101. LOHRER
    Surface metal/non-metal · Mesa Minerals · MSHA ID 0405324
    Abandoned
  102. LYNCH PIT
    Surface metal/non-metal · Robert L Lynch Trucking · MSHA ID 0405176
    Abandoned
  103. Murphy Canyon Crusher Plant
    Surface metal/non-metal · Daley Corp · MSHA ID 0401748
    Abandoned
  104. Muzzle Loader
    Underground metal/non-metal · River Park Mining · MSHA ID 0404571
    Abandoned
  105. NORTH TWIN OAKS VALLEY QUARRY
    Surface metal/non-metal · South Coast Materials Company · MSHA ID 0404621
    Abandoned
  106. Old Noble Mines
    Facility metal/non-metal · Old Noble Mine · MSHA ID 0403708
    Abandoned
  107. Padre-Pankey Sand & Gravel
    Surface metal/non-metal · Padre-Pankey Sand & Gravel · MSHA ID 0404659
    Abandoned
  108. PAUMA VALLEY MINE
    Surface metal/non-metal · Colwell Equipment · MSHA ID 0405226
    Abandoned
  109. PAUMA VALLEY PORTABLE PLANT
    Surface metal/non-metal · A Julian Trucking · MSHA ID 0405192
    Abandoned
  110. Portable Crusher #4
    Surface metal/non-metal · Chilcote Inc · MSHA ID 0405052
    Abandoned
  111. PORTABLE PLANT "B"
    Facility metal/non-metal · Aman Brothers Inc · MSHA ID 0404964
    Abandoned
  112. Portable Plant A
    Surface metal/non-metal · Silberberger Engineers Inc · MSHA ID 0405255
    Abandoned
  113. PORTABLE PLANT A-33.1
    Surface metal/non-metal · Roy E Ladd Inc · MSHA ID 0405254
    Abandoned
  114. Portable Unit #1
    Surface metal/non-metal · Tony'S Tractor Work Inc · MSHA ID 0405001
    Abandoned
  115. Ranch Materials
    Surface metal/non-metal · Ranch Materials · MSHA ID 0404861
    Abandoned
  116. RANCHO CIELO ROCK PLANT
    Surface metal/non-metal · Granite Construction Company · MSHA ID 0405279
    Abandoned
  117. Reliable Crusher
    Surface metal/non-metal · C W Poss Inc · MSHA ID 0405118
    Abandoned
  118. Rich & Whillock Incorporated
    Surface metal/non-metal · Rich & Whillock Inc · MSHA ID 0404631
    Abandoned
  119. S.D. PORTABLE PLANT #2
    Surface metal/non-metal · Sd Engineering Inc · MSHA ID 0405148
    Abandoned
  120. San Pasqual Pit
    Surface metal/non-metal · Sorrento Sand Company Inc · MSHA ID 0403837
    Abandoned
  121. SD PORTABLE PLANT #1
    Surface metal/non-metal · Sd Engineering Inc · MSHA ID 0404858
    Abandoned
  122. Srmp
    Surface metal/non-metal · Sorrento Ready Mix Inc · MSHA ID 0405010
    Abandoned
  123. Temecula Sand
    Surface metal/non-metal · Perrault Corporation · MSHA ID 0405705
    Abandoned
  124. TOURMALINE QUEEN MINE
    Underground metal/non-metal · San Diego Mining Company · MSHA ID 0405466
    Abandoned
  125. Twin Oaks Pit
    Surface metal/non-metal · Twin Oaks Engineering Inc · MSHA ID 0403849
    Abandoned
  126. Valley Materials
    Surface metal/non-metal · Valley Materials · MSHA ID 0404842
    Abandoned
  127. Valley Materials
    Surface metal/non-metal · Valley Materials · MSHA ID 0404844
    Abandoned
  128. Valley Materials
    Surface metal/non-metal · Valley Materials · MSHA ID 0404983
    Abandoned
  129. Vulcan Poway
    Surface metal/non-metal · Perrault Corporation · MSHA ID 0405706
    Abandoned
  130. Western Salt Company Plant
    Surface metal/non-metal · Western Salt Company · MSHA ID 0401600
    Abandoned

Status, type and operator are as reported to MSHA. Fatality and accident counts are MSHA's reportable accident records for the mine; citations are inspector-issued violations on record. Each mine's own page carries the full detail.

Other counties in CaliforniaAll counties →
How to read these numbers

The register is MSHA's Mine Data Retrieval System: every operation ever assigned a mine ID, including ones abandoned decades ago, so the count is a history of mining in the county, not a count of working mines. A mine's county is the one its operator reported to MSHA. Fatality and accident counts start with MSHA's reportable-accident records (1983 onward); citation counts are inspector-issued violations on record. We are an independent research tool, not MSHA.