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MSHA mine register by county

Mines in Riverside County, California

Riverside County, California has 189 mines on MSHA's register: 33 active, 3 intermittent, 153 abandoned. 5 miners have died and 1,873 accidents have been reported at these mines between 1983 and 2026. Inspectors have issued 7,942 citations.

Every mine MSHA has registered in Riverside 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 Riverside County →

Mines on register
189
Active
33
Fatalities on record
5
Citations issued
7,942
4 underground · 180 surface · 5 facilities 0 coal · 189 metal and non-metal 3 intermittent 153 abandoned 1,873 reported accidents, 1983–2026
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.
Riverside County, California · Population 2,449,909
0.1%
Mining share of county employment
$89,672
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
North County Sand & Gravel Inc 8 0 0
C D G Materials Inc 4 0 0
CHANDLER AGGREGATES INC 4 2 0
Robertson's 4 4 0
Coronet Concrete Products Inc 3 2 0
E L Yeager Construction Company Inc 3 0 0
FST Sand & Gravel Inc. 3 1 0
Hanmer Materials 3 0 0
Pacific Clay Products, Inc. 3 1 0
Martin Marietta Southern California Aggregates,LLC 2 2 1
Mines in Riverside County189 on register
  1. 3M CORONA PLANT
    Surface metal/non-metal · 3M Company · MSHA ID 0400191
    Active
  2. Mayhew Plant
    Surface metal/non-metal · MAMR LLC DBA Maitri Road Recycling · MSHA ID 0403871
    Active
  3. HJ HOVE
    Surface metal/non-metal · HI-GRADE MATERIALS CO. · MSHA ID 0401854
    Active
  4. All American Aggregates
    Surface metal/non-metal · All American Aggregates · MSHA ID 0403646
    Active
  5. EAGLE VALLEY AGGREGATES
    Surface metal/non-metal · Martin Marietta Southern California Aggregates,LLC · MSHA ID 0404758
    Active
  6. MAITRI CANYON PLANT
    Surface metal/non-metal · Foster Sand & Gravel · MSHA ID 0403684
    Active
  7. Maitri Sand and Gravel
    Surface metal/non-metal · Martin Marietta Southern California Aggregates,LLC · MSHA ID 0404157
    Active
  8. Pacific Aggregates Pits
    Surface metal/non-metal · Pacific Aggregates Inc · MSHA ID 0405635
    Active
  9. 3M
    Surface metal/non-metal · FST Sand & Gravel Inc · MSHA ID 0405075
    Active
  10. Thousand Palms Pit
    Surface metal/non-metal · Coronet Concrete Products · MSHA ID 0404807
    Active
  11. Banning
    Surface metal/non-metal · Robertson's · MSHA ID 0402815
    Active
  12. Cabazon
    Surface metal/non-metal · Robertson's · MSHA ID 0402774
    Active
  13. Corona Plant
    Surface metal/non-metal · CalMat Co · MSHA ID 0405095
    Active
  14. West Coast Aggregate Supply Inc
    Surface metal/non-metal · West Coast Aggregate Supply Inc · MSHA ID 0404209
    Active
  15. COACHELLA VALLEY AGGREGATE
    Surface metal/non-metal · Coachella Valley Aggregates Inc · MSHA ID 0405365
    Active
  16. DILLON ROAD PIT
    Surface metal/non-metal · Superior Ready Mix Concrete L.P. · MSHA ID 0404937
    Active
  17. Corona
    Surface metal/non-metal · Robertson's · MSHA ID 0405887
    Active
  18. West Coast Aggregate Supply Inc
    Surface metal/non-metal · West Coast Aggregate Supply Inc · MSHA ID 0404731
    Active
  19. NICHOLS ROAD PIT
    Surface metal/non-metal · CHANDLER AGGREGATES INC · MSHA ID 0405638
    Active
  20. Crawford's Mine
    Surface metal/non-metal · Crawford Associates · MSHA ID 0405132
    Active
  21. Riverside Operation
    Facility metal/non-metal · Riverside Milling Company, LLC · MSHA ID 0404263
    Active
  22. Painted Hills Quarry
    Surface metal/non-metal · Painted Hills Mining Company · MSHA ID 0400351
    Active
  23. CHANDLER AGGREGATES - GILMAN SPRINGS
    Surface metal/non-metal · CHANDLER AGGREGATES · MSHA ID 0405536
    Active
  24. The Standard Mine
    Surface metal/non-metal · Double D Mining LLC · MSHA ID 0405663
    Active
  25. PORTABLE PLANT #1
    Surface metal/non-metal · QUALITY AGGREGATES INC. · MSHA ID 0405802
    Active
  26. Pacific Clay Pits
    Surface metal/non-metal · Pacific Clay Products Inc · MSHA ID 0400558
    Active
  27. PLANT #5
    Surface metal/non-metal · ONYX MATERIALS · MSHA ID 0405451
    Active
  28. DILLON PLANT
    Surface metal/non-metal · Coronet Concrete Products · MSHA ID 0405447
    Active
  29. Juniper Flats
    Surface metal/non-metal · Robertson's · MSHA ID 0405097
    Active
  30. EAGLE VALLEY
    Surface metal/non-metal · PACIFIC STATES TRANSPORTATION · MSHA ID 0405574
    Active
  31. Eagle Mountain Mine
    Surface metal/non-metal · Aggregate & Mineral Resource Group LLC · MSHA ID 0402511
    Active
  32. S-5 Red
    Surface metal/non-metal · Upland Rock · MSHA ID 0405857
    Active
  33. Portable Plant
    Surface metal/non-metal · Transamerican Soil Services Inc. · MSHA ID 0405835
    Active
  34. Crestmore Quarry
    Facility metal/non-metal · Riverside Cement Co · MSHA ID 0400010
    Abandoned
  35. CORONA INDUSTRIAL SAND PROJECT
    Surface metal/non-metal · Corona Industrial Sand Project · MSHA ID 0404862
    Abandoned
  36. Elsinore Pit & Mill
    Surface metal/non-metal · Elsinore Ready Mix Co Inc · MSHA ID 0402020
    Abandoned
  37. Moreno Valley Sand & Gravel
    Surface metal/non-metal · Triangle Rock Products Inc · MSHA ID 0403648
    Abandoned
  38. MOBILE SAND COMPANY
    Surface metal/non-metal · Mobile Sand Company · MSHA ID 0404443
    Abandoned
  39. Prado
    Surface metal/non-metal · Owl Rock Products · MSHA ID 0401882
    Abandoned
  40. Pyrite Quarry
    Surface metal/non-metal · Stone Valley Materials, LLC · MSHA ID 0404680
    Abandoned
  41. Fargo Canyon Mine
    Surface metal/non-metal · Coronet Concrete Products Inc · MSHA ID 0404470
    Abandoned
  42. MORONGO PLANT
    Surface metal/non-metal · Triangle Rock Products Inc · MSHA ID 0404826
    Abandoned
  43. Aguanga Plant
    Surface metal/non-metal · Shamrock Sand & Rock LLC · MSHA ID 0403366
    Abandoned
  44. Fab-Tech 18
    Surface metal/non-metal · North County Sand & Gravel Inc · MSHA ID 0405518
    Abandoned
  45. Harlow Quarry/Corona
    Surface metal/non-metal · Barney Northcote Inc · MSHA ID 0405595
    Abandoned
  46. North Murrieta
    Surface metal/non-metal · So Cal Sandbags, Inc. · MSHA ID 0405525
    Abandoned
  47. Portable Plant 8
    Surface metal/non-metal · North American Recycling and Crushing LLC. · MSHA ID 0405308
    Abandoned
  48. Soboba Pit
    Surface metal/non-metal · Boral Resources Inc · MSHA ID 0404690
    Abandoned
  49. NORTH FONTANA
    Surface metal/non-metal · EARTH TEK ENGINEERING CORP. · MSHA ID 0404901
    Intermittent
  50. Portable #1
    Surface metal/non-metal · Chandler Aggregates Inc · MSHA ID 0405452
    Abandoned
  51. Plant #4
    Surface metal/non-metal · Gail Materials Inc · MSHA ID 0405450
    Abandoned
  52. Wyroc Lake Street Portable Plant
    Surface metal/non-metal · Wyroc Inc · MSHA ID 0405065
    Abandoned
  53. Portable Crusher 1
    Surface metal/non-metal · Rentrac Inc · MSHA ID 0405713
    Abandoned
  54. Chandler Aggregates Coldwater Pl
    Surface metal/non-metal · Chandler Aggregates Inc · MSHA ID 0404549
    Abandoned
  55. Fab-Tech 09
    Surface metal/non-metal · North County Sand & Gravel Inc · MSHA ID 0405609
    Abandoned
  56. Crestmore Mine
    Underground metal/non-metal · Riverside Cement Company · MSHA ID 0404347
    Abandoned
  57. Temescal Canyon Pit & Mill
    Surface metal/non-metal · Boral Resources Inc · MSHA ID 0403651
    Abandoned
  58. Wyroc Apple Valley
    Surface metal/non-metal · Wyroc Inc · MSHA ID 0405494
    Abandoned
  59. Soboba Plant
    Surface metal/non-metal · San Jacinto Aggregates Inc · MSHA ID 0404923
    Abandoned
  60. Harlow Quarry
    Surface metal/non-metal · Paul Hubbs Construction Co · MSHA ID 0402377
    Abandoned
  61. CEC PLANT
    Surface metal/non-metal · C D G Materials Inc · MSHA ID 0405476
    Abandoned
  62. Quintana Gypsum Company
    Surface metal/non-metal · Quintana Gypsum Company · MSHA ID 0404276
    Abandoned
  63. Plant A
    Surface metal/non-metal · Titan Crushing · MSHA ID 0405743
    Abandoned
  64. Fab-Tech 17
    Surface metal/non-metal · North County Sand & Gravel Inc · MSHA ID 0405517
    Abandoned
  65. Plant A
    Surface metal/non-metal · Skanska USA Civil West California District Inc. · MSHA ID 0404962
    Abandoned
  66. #2 Portable
    Surface metal/non-metal · Rock Structures Construction Co · MSHA ID 0405553
    Abandoned
  67. Plant A
    Surface metal/non-metal · Barrons Management LLC · MSHA ID 0405716
    Abandoned
  68. CORONA
    Surface metal/non-metal · Robertsons Ltd · MSHA ID 0405350
    Abandoned
  69. PHILADELPHIA RECYCLING MINE
    Surface metal/non-metal · Philadelphia Recycling Mine · MSHA ID 0405066
    Abandoned
  70. Plant #3
    Surface metal/non-metal · Gail Materials Inc · MSHA ID 0405434
    Abandoned
  71. Hostetter Sand & Gravel #2
    Surface metal/non-metal · Erik Hostetter Sand & Gravel · MSHA ID 0405544
    Abandoned
  72. Pacific Clay
    Surface metal/non-metal · Robert R Ford Trucking Inc · MSHA ID 0405420
    Abandoned
  73. PORTABLE PLANT #1
    Surface metal/non-metal · C D G Materials Inc · MSHA ID 0405469
    Abandoned
  74. Liston
    Surface metal/non-metal · California Portland Cement Company · MSHA ID 0400557
    Abandoned
  75. SHEPWELLS INC.
    Surface metal/non-metal · Shepwell'S Inc · MSHA ID 0404196
    Abandoned
  76. Fab-Tech 49
    Surface metal/non-metal · North County Sand & Gravel Inc · MSHA ID 0405549
    Abandoned
  77. Clinton Keith Rock Crusher
    Surface metal/non-metal · North County Sand & Gravel Inc · MSHA ID 0405645
    Abandoned
  78. Dayton Trucking (Port)
    Surface metal/non-metal · Dayton Trucking · MSHA ID 0405546
    Abandoned
  79. PLANT #1
    Surface metal/non-metal · Gail Materials Inc · MSHA ID 0405449
    Abandoned
  80. Portable Plant 2
    Surface metal/non-metal · Wilson Grading · MSHA ID 0405794
    Abandoned
  81. S-5 PLANT
    Surface metal/non-metal · C D G Materials Inc · MSHA ID 0405329
    Abandoned
  82. Pacific States Plant #1
    Surface metal/non-metal · Pacific States Transportation · MSHA ID 0405534
    Abandoned
  83. R.J.Noble Co.
    Surface metal/non-metal · R.J.Noble Co. · MSHA ID 0405658
    Abandoned
  84. C W Poss Crushing
    Surface metal/non-metal · C W Poss Inc · MSHA ID 0405138
    Abandoned
  85. Portable Crusher #1
    Surface metal/non-metal · L&G Portable Crushing and Materials, LLC · MSHA ID 0405883
    Abandoned
  86. S-5 Yellow
    Surface metal/non-metal · Upland Rock · MSHA ID 0405852
    Abandoned
  87. 968AB Power Screen
    Surface metal/non-metal · Riverside County Transportation Dept · MSHA ID 0405878
    Intermittent
  88. River Road Sand Job
    Surface metal/non-metal · KEC Engineering · MSHA ID 0405505
    Abandoned
  89. Portable #1
    Surface metal/non-metal · G.S.I. Inc · MSHA ID 0405543
    Abandoned
  90. Riverside
    Surface metal/non-metal · A-1 Grit · MSHA ID 0405735
    Abandoned
  91. Bio Gyp
    Facility metal/non-metal · Bio Gyp LLC · MSHA ID 0405763
    Abandoned
  92. Portable #1
    Surface metal/non-metal · CJW Construction, Inc · MSHA ID 0405861
    Abandoned
  93. Portable Plant 1
    Surface metal/non-metal · Maurio Wilson · MSHA ID 0405784
    Abandoned
  94. 3m
    Surface metal/non-metal · Fst Sand & Gravel Inc · MSHA ID 0405028
    Abandoned
  95. Bautista Canyon Plant
    Surface metal/non-metal · North County Sand & Gravel Inc · MSHA ID 0405030
    Abandoned
  96. Cajalco Pit
    Surface metal/non-metal · C L Pharris Sand & Gravel Inc · MSHA ID 0405069
    Abandoned
  97. Corona Clay Mines
    Surface metal/non-metal · Corona Clay Company · MSHA ID 0401877
    Abandoned
  98. D. YOUNGER PIT
    Surface metal/non-metal · D Younger Company · MSHA ID 0404649
    Abandoned
  99. Dawson Canyon Plant
    Surface metal/non-metal · C L Pharris Sand & Gravel Inc · MSHA ID 0404836
    Abandoned
  100. Maitri Plant
    Surface metal/non-metal · J F & T Sand Company · MSHA ID 0403762
    Abandoned
  101. Rainbow Tk Inspection Facility
    Surface metal/non-metal · Vance Corp · MSHA ID 0405152
    Abandoned
  102. Sand Portable #1
    Surface metal/non-metal · Del Rio Enterprise Inc · MSHA ID 0405563
    Abandoned
  103. Whitewater
    Surface metal/non-metal · Granite Construction Company · MSHA ID 0404759
    Abandoned
  104. PORTABLE PLANT #3
    Surface metal/non-metal · Hanmer Materials · MSHA ID 0405274
    Abandoned
  105. Sand Plant
    Surface metal/non-metal · Cooley Equipment Corp · MSHA ID 0405668
    Abandoned
  106. Corona Clay
    Surface metal/non-metal · Rentrac Inc · MSHA ID 0405685
    Abandoned
  107. Corona PA
    Surface metal/non-metal · J & R Materials · MSHA ID 0405698
    Abandoned
  108. Corona/Prado
    Surface metal/non-metal · Dan Copp Crushing Corp · MSHA ID 0405270
    Abandoned
  109. Redlands/S-5 Extec
    Surface metal/non-metal · Barney Northcote Inc · MSHA ID 0405594
    Abandoned
  110. FINLAY PORTABLE
    Surface metal/non-metal · Erik S Hostetter Sand & Gravel · MSHA ID 0405493
    Abandoned
  111. Pioneer
    Surface metal/non-metal · Baldi Bros Inc · MSHA ID 0405669
    Abandoned
  112. Portable 1
    Surface metal/non-metal · Orange County Sandbagger · MSHA ID 0405506
    Abandoned
  113. 966AB MCCLOSKEY
    Surface metal/non-metal · Riverside County Transportation Dept · MSHA ID 0405877
    Intermittent
  114. Cay Plant 73
    Surface metal/non-metal · North County Sand & Gravel Inc · MSHA ID 0405673
    Abandoned
  115. Plant #2
    Surface metal/non-metal · North American Recycling and Crushing, LLC · MSHA ID 0405631
    Abandoned
  116. PORTABLE PLANT #2
    Surface metal/non-metal · Hanmer Materials · MSHA ID 0405197
    Abandoned
  117. PORTABLE PLANT 2
    Facility metal/non-metal · C D G Materials Inc · MSHA ID 0405470
    Abandoned
  118. PRADO
    Surface metal/non-metal · FST Sand & Gravel Inc. · MSHA ID 0405087
    Abandoned
  119. Avalon Pit
    Surface metal/non-metal · T.N.T. Equip Rental · MSHA ID 0405580
    Abandoned
  120. #4 Portable
    Surface metal/non-metal · Rock Structures Construction · MSHA ID 0405911
    Abandoned
  121. Portable Equipment #2
    Surface metal/non-metal · So Cal Sandbags, Inc. · MSHA ID 0405708
    Abandoned
  122. Temecula #2
    Surface metal/non-metal · GSI · MSHA ID 0405584
    Abandoned
  123. 1000 Palms Rock Plant
    Surface metal/non-metal · Southwestern Aggregates Inc · MSHA ID 0403685
    Abandoned
  124. 33870P-1
    Surface metal/non-metal · Ortiz Enterprise Inc · MSHA ID 0405702
    Abandoned
  125. Agnes Wilson Quarry
    Surface metal/non-metal · Kessen & Kessen Construction Company · MSHA ID 0404796
    Abandoned
  126. Alberhill Dee Gee
    Surface metal/non-metal · Alberhill Dee Gee · MSHA ID 0404827
    Abandoned
  127. Alfredo A Figueroa
    Surface metal/non-metal · Alfredo A Figueroa · MSHA ID 0403771
    Abandoned
  128. Amra Incorporated
    Surface metal/non-metal · Amra Inc · MSHA ID 0404810
    Abandoned
  129. Astec 1
    Surface metal/non-metal · Fox Material · MSHA ID 0405822
    Abandoned
  130. Atkinson Quarry
    Surface metal/non-metal · Paul Hubbs Construction Company Inc · MSHA ID 0404746
    Abandoned
  131. Bautista Cyn Plant
    Surface metal/non-metal · Sun Sand · MSHA ID 0405029
    Abandoned
  132. BLM CAMC CLAIM #'S:48944THR48960
    Surface metal/non-metal · California Calcium Carbonate Inc · MSHA ID 0405305
    Abandoned
  133. California Portable #2
    Surface metal/non-metal · Kiewit Pacific Co. · MSHA ID 0405207
    Abandoned
  134. Chuckawalla Mine
    Surface metal/non-metal · Chuckawalla Mining Company Inc · MSHA ID 0404718
    Abandoned
  135. Coplin Granite Pit
    Surface metal/non-metal · Corona Dee-Gee Company · MSHA ID 0401618
    Abandoned
  136. CORONA AGGREGATES
    Surface metal/non-metal · Corona Aggregates Inc · MSHA ID 0405154
    Abandoned
  137. Corona Plant Mine
    Surface metal/non-metal · Gladding Mc Bean · MSHA ID 0400569
    Abandoned
  138. Corona Quarry
    Surface metal/non-metal · L S Hawley Corp · MSHA ID 0404200
    Abandoned
  139. Crestmore Plant
    Surface metal/non-metal · E L Yeager Construction Company Inc · MSHA ID 0404956
    Abandoned
  140. D & D Materials
    Surface metal/non-metal · D & D Materials · MSHA ID 0405099
    Abandoned
  141. D & D Sand & Gravel
    Surface metal/non-metal · D & D Sand & Gravel · MSHA ID 0405057
    Abandoned
  142. Dominguez Clay Mine
    Surface metal/non-metal · United States Tile Company · MSHA ID 0404294
    Abandoned
  143. E D S Incorporated (Sand & Gravel)
    Surface metal/non-metal · E D S Inc · MSHA ID 0404535
    Abandoned
  144. Easles Nest Mine
    Underground metal/non-metal · Eagles Nest Company · MSHA ID 0404379
    Abandoned
  145. Grand Canyon Quarries
    Surface metal/non-metal · Grand Canyon Quarries · MSHA ID 0403696
    Abandoned
  146. Greenstone Crushing
    Surface metal/non-metal · Greenstone Materials Inc · MSHA ID 0405816
    Abandoned
  147. Harrington Pit
    Surface metal/non-metal · Corona Clay Company · MSHA ID 0404164
    Abandoned
  148. Hills Ranch Quarry
    Surface metal/non-metal · Fairfax & Rogers Construction · MSHA ID 0404798
    Abandoned
  149. Hoist Pit
    Surface metal/non-metal · Pacific Clay Products · MSHA ID 0405637
    Abandoned
  150. Hostetter Portable #3
    Surface metal/non-metal · Hostetter Sand & Gravel Inc · MSHA ID 0405649
    Abandoned
  151. Indio Hills Aggregate
    Surface metal/non-metal · Master Sand Materials · MSHA ID 0404957
    Abandoned
  152. J & J Topsoil
    Surface metal/non-metal · J & J Topsoil · MSHA ID 0405145
    Abandoned
  153. J W Sand & Materials
    Surface metal/non-metal · J W Sand & Materials Inc · MSHA ID 0405195
    Abandoned
  154. Juaro Canyon Quarry
    Surface metal/non-metal · L S Hawley Corp · MSHA ID 0404452
    Abandoned
  155. Kasler Rock
    Surface metal/non-metal · Kasler Corp · MSHA ID 0405171
    Abandoned
  156. LAKE ELSINORE
    Surface metal/non-metal · Dan Copp Crushing Corp · MSHA ID 0405269
    Abandoned
  157. Levy Quarries
    Surface metal/non-metal · Levy Quarries · MSHA ID 0404224
    Abandoned
  158. Master Sand Materials
    Facility metal/non-metal · Master Sand Materials · MSHA ID 0404293
    Abandoned
  159. Means Construction Company Incorporated
    Surface metal/non-metal · Means Construction Company Inc · MSHA ID 0405022
    Abandoned
  160. Metropolitan Portal Rock Stock-Pile
    Surface metal/non-metal · L S Hawley Corp & Paul Hubbs Construction · MSHA ID 0404451
    Abandoned
  161. Milligan Mine And Mill
    Surface metal/non-metal · Standard Salt & Chemical Company · MSHA ID 0401596
    Abandoned
  162. Mission Mine
    Underground metal/non-metal · Sierra Madre Mineral Development Corp · MSHA ID 0404501
    Abandoned
  163. Navarro Mine
    Surface metal/non-metal · Navarro Building Stone · MSHA ID 0404223
    Abandoned
  164. NORCO BEACON HILL
    Surface metal/non-metal · Norco Beacon Hill Development Company · MSHA ID 0405328
    Abandoned
  165. One Thousand Palms Rock Plant
    Surface metal/non-metal · E L Yeager Construction Company Inc · MSHA ID 0404455
    Abandoned
  166. Perris Materials Pit
    Surface metal/non-metal · Perris Valley Materials Corp · MSHA ID 0404756
    Abandoned
  167. Perris Valley Material
    Surface metal/non-metal · Perris Valley Materials Corp · MSHA ID 0404750
    Abandoned
  168. Plant 1
    Surface metal/non-metal · Hard Rock Crushing Services Inc · MSHA ID 0405818
    Abandoned
  169. Plata Oro Mine
    Surface metal/non-metal · Neil Monahan · MSHA ID 0404526
    Abandoned
  170. Portable Plant #3
    Surface metal/non-metal · Superstition Crushing Company · MSHA ID 0405067
    Abandoned
  171. Portable Plant #4
    Surface metal/non-metal · Hanmer Materials · MSHA ID 0405286
    Abandoned
  172. PYRITE QUARRY
    Surface metal/non-metal · Vance Corp · MSHA ID 0405310
    Abandoned
  173. Quandt Borrow Pit
    Surface metal/non-metal · Quandt Materials · MSHA ID 0404650
    Abandoned
  174. Railroad Canyon D G Pit
    Surface metal/non-metal · Hernandez Trucking · MSHA ID 0404742
    Abandoned
  175. Ripley Quarry
    Surface metal/non-metal · Fairfax & Rogers Construction · MSHA ID 0404797
    Abandoned
  176. Sanderson Plant
    Surface metal/non-metal · North County Sand & Gravel Inc · MSHA ID 0405235
    Abandoned
  177. Santa Ana River Pit
    Surface metal/non-metal · Riverside Sand Co · MSHA ID 0401927
    Abandoned
  178. Smc/Soboba Materials Company
    Surface metal/non-metal · Smc/Soboba Materials Company · MSHA ID 0405078
    Abandoned
  179. Smith Sand
    Surface metal/non-metal · Riverside Cement Company · MSHA ID 0405002
    Abandoned
  180. Sweetwater Plant
    Surface metal/non-metal · Nelson & Sloan · MSHA ID 0401868
    Abandoned
  181. Tahquitz Creek Project
    Surface metal/non-metal · E L Yeager Construction Company Inc · MSHA ID 0405123
    Abandoned
  182. The Rock Plant
    Surface metal/non-metal · Praise The Lord Rock & Sand · MSHA ID 0404668
    Abandoned
  183. TONKCO-HARLOW
    Surface metal/non-metal · Tonkco Corp · MSHA ID 0405341
    Abandoned
  184. Tri-Valley (Chen) Pit
    Surface metal/non-metal · Pacific Clay Products, Inc. · MSHA ID 0405639
    Abandoned
  185. U S Gypsum Claim
    Surface metal/non-metal · Pfizer Inc · MSHA ID 0404498
    Abandoned
  186. U S Site #6 Mine
    Surface metal/non-metal · United States Tile Company · MSHA ID 0405008
    Abandoned
  187. US Rock Corp - Wildomar Pit
    Surface metal/non-metal · US Rock Corporation · MSHA ID 0405904
    Abandoned
  188. White Wing Mine
    Underground metal/non-metal · Ken Pan Ltd · MSHA ID 0404640
    Abandoned
  189. Wyroc Norco
    Surface metal/non-metal · Wyroc Inc · MSHA ID 0405531
    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.

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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.