Abandoned mines in Riverside County, California

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   741 23.0%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   1,914 59.3%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   197 6.1%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   318 9.9%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   56 1.7%
6. Mills, tipples and facilities

   processing plants and hazardous structures
   1 0.0%

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. #2 Portable

   Surface metal/non-metal · Rock Structures Construction Co · MSHA ID 0405553
   Abandoned 2018-05-09
2. #4 Portable

   Surface metal/non-metal · Rock Structures Construction · MSHA ID 0405911
   Abandoned 2018-05-01
3. 1000 Palms Rock Plant

   Surface metal/non-metal · Southwestern Aggregates Inc · MSHA ID 0403685
   Abandoned 1980-05-28
4. 33870P-1

   Surface metal/non-metal · Ortiz Enterprise Inc · MSHA ID 0405702
   Abandoned 2007-05-10
5. 3m

   Surface metal/non-metal · Fst Sand & Gravel Inc · MSHA ID 0405028
   Abandoned 1993-08-12
6. Agnes Wilson Quarry

   Surface metal/non-metal · Kessen & Kessen Construction Company · MSHA ID 0404796
   Abandoned 1986-06-16
7. Aguanga Plant

   Surface metal/non-metal · Shamrock Sand & Rock LLC · MSHA ID 0403366
   Abandoned 2007-02-16
8. Alberhill Dee Gee

   Surface metal/non-metal · Alberhill Dee Gee · MSHA ID 0404827
   Abandoned 1988-10-18
9. Alfredo A Figueroa

   Surface metal/non-metal · Alfredo A Figueroa · MSHA ID 0403771
   Abandoned 1984-05-21
10. Amra Incorporated

    Surface metal/non-metal · Amra Inc · MSHA ID 0404810
    Abandoned 1990-08-03
11. Astec 1

    Surface metal/non-metal · Fox Material · MSHA ID 0405822
    Abandoned 2011-04-22
12. Atkinson Quarry

    Surface metal/non-metal · Paul Hubbs Construction Company Inc · MSHA ID 0404746
    Abandoned 1991-06-13
13. Avalon Pit

    Surface metal/non-metal · T.N.T. Equip Rental · MSHA ID 0405580
    Abandoned 2006-05-10
14. Bautista Canyon Plant

    Surface metal/non-metal · North County Sand & Gravel Inc · MSHA ID 0405030
    Abandoned 1994-03-23
15. Bautista Cyn Plant

    Surface metal/non-metal · Sun Sand · MSHA ID 0405029
    Abandoned 1990-03-19
16. Bio Gyp

    Facility metal/non-metal · Bio Gyp LLC · MSHA ID 0405763
    Abandoned 2013-11-05
17. BLM CAMC CLAIM #'S:48944THR48960

    Surface metal/non-metal · California Calcium Carbonate Inc · MSHA ID 0405305
    Abandoned 2000-01-10
18. C W Poss Crushing

    Surface metal/non-metal · C W Poss Inc · MSHA ID 0405138
    Abandoned 1992-11-02
19. Cajalco Pit

    Surface metal/non-metal · C L Pharris Sand & Gravel Inc · MSHA ID 0405069
    Abandoned 1991-10-21
20. California Portable #2

    Surface metal/non-metal · Kiewit Pacific Co. · MSHA ID 0405207
    Abandoned 1994-01-10
21. Cay Plant 73

    Surface metal/non-metal · North County Sand & Gravel Inc · MSHA ID 0405673
    Abandoned 2007-11-26
22. CEC PLANT

    Surface metal/non-metal · C D G Materials Inc · MSHA ID 0405476
    Abandoned 2017-04-15
23. Chandler Aggregates Coldwater Pl

    Surface metal/non-metal · Chandler Aggregates Inc · MSHA ID 0404549
    Abandoned 2005-06-08
24. Chuckawalla Mine

    Surface metal/non-metal · Chuckawalla Mining Company Inc · MSHA ID 0404718
    Abandoned 1988-08-01
25. Clinton Keith Rock Crusher

    Surface metal/non-metal · North County Sand & Gravel Inc · MSHA ID 0405645
    Abandoned 2018-09-30
26. Coplin Granite Pit

    Surface metal/non-metal · Corona Dee-Gee Company · MSHA ID 0401618
    Abandoned 1985-11-15
27. CORONA

    Surface metal/non-metal · Robertsons Ltd · MSHA ID 0405350
    Abandoned 2001-09-24
28. CORONA AGGREGATES

    Surface metal/non-metal · Corona Aggregates Inc · MSHA ID 0405154
    Abandoned 1997-03-28
29. Corona Clay

    Surface metal/non-metal · Rentrac Inc · MSHA ID 0405685
    Abandoned 2009-02-01
30. Corona Clay Mines

    Surface metal/non-metal · Corona Clay Company · MSHA ID 0401877
    Abandoned 1991-02-21
31. CORONA INDUSTRIAL SAND PROJECT

    Surface metal/non-metal · Corona Industrial Sand Project · MSHA ID 0404862
    Abandoned 1997-12-15
32. Corona PA

    Surface metal/non-metal · J & R Materials · MSHA ID 0405698
    Abandoned 2009-09-01
33. Corona Plant Mine

    Surface metal/non-metal · Gladding Mc Bean · MSHA ID 0400569
    Abandoned 1980-09-09
34. Corona Quarry

    Surface metal/non-metal · L S Hawley Corp · MSHA ID 0404200
    Abandoned 1989-01-05
35. Corona/Prado

    Surface metal/non-metal · Dan Copp Crushing Corp · MSHA ID 0405270
    Abandoned 2003-11-18
36. Crestmore Mine

    Underground metal/non-metal · Riverside Cement Company · MSHA ID 0404347
    Abandoned 1986-03-19
37. Crestmore Plant

    Surface metal/non-metal · E L Yeager Construction Company Inc · MSHA ID 0404956
    Abandoned 1995-08-16
38. Crestmore Quarry

    Facility metal/non-metal · Riverside Cement Co · MSHA ID 0400010
    Abandoned 2015-11-01
39. D & D Materials

    Surface metal/non-metal · D & D Materials · MSHA ID 0405099
    Abandoned 1991-03-07
40. D & D Sand & Gravel

    Surface metal/non-metal · D & D Sand & Gravel · MSHA ID 0405057
    Abandoned 1992-11-02
41. D. YOUNGER PIT

    Surface metal/non-metal · D Younger Company · MSHA ID 0404649
    Abandoned 2000-03-07
42. Dawson Canyon Plant

    Surface metal/non-metal · C L Pharris Sand & Gravel Inc · MSHA ID 0404836
    Abandoned 1989-05-26
43. Dayton Trucking (Port)

    Surface metal/non-metal · Dayton Trucking · MSHA ID 0405546
    Abandoned 2009-07-24
44. Dominguez Clay Mine

    Surface metal/non-metal · United States Tile Company · MSHA ID 0404294
    Abandoned 1990-06-21
45. E D S Incorporated (Sand & Gravel)

    Surface metal/non-metal · E D S Inc · MSHA ID 0404535
    Abandoned 1985-07-30
46. Easles Nest Mine

    Underground metal/non-metal · Eagles Nest Company · MSHA ID 0404379
    Abandoned 1983-03-21
47. Elsinore Pit & Mill

    Surface metal/non-metal · Elsinore Ready Mix Co Inc · MSHA ID 0402020
    Abandoned 2003-11-25
48. Fab-Tech 09

    Surface metal/non-metal · North County Sand & Gravel Inc · MSHA ID 0405609
    Abandoned 2019-12-31
49. Fab-Tech 17

    Surface metal/non-metal · North County Sand & Gravel Inc · MSHA ID 0405517
    Abandoned 2012-07-02
50. Fab-Tech 18

    Surface metal/non-metal · North County Sand & Gravel Inc · MSHA ID 0405518
    Abandoned 2017-01-04
51. Fab-Tech 49

    Surface metal/non-metal · North County Sand & Gravel Inc · MSHA ID 0405549
    Abandoned 2009-09-10
52. Fargo Canyon Mine

    Surface metal/non-metal · Coronet Concrete Products Inc · MSHA ID 0404470
    Abandoned 2022-01-20
53. FINLAY PORTABLE

    Surface metal/non-metal · Erik S Hostetter Sand & Gravel · MSHA ID 0405493
    Abandoned 2007-01-29
54. Grand Canyon Quarries

    Surface metal/non-metal · Grand Canyon Quarries · MSHA ID 0403696
    Abandoned 1983-07-19
55. Greenstone Crushing

    Surface metal/non-metal · Greenstone Materials Inc · MSHA ID 0405816
    Abandoned 2011-10-01
56. Harlow Quarry

    Surface metal/non-metal · Paul Hubbs Construction Co · MSHA ID 0402377
    Abandoned 2008-01-18
57. Harlow Quarry/Corona

    Surface metal/non-metal · Barney Northcote Inc · MSHA ID 0405595
    Abandoned 2019-01-02
58. Harrington Pit

    Surface metal/non-metal · Corona Clay Company · MSHA ID 0404164
    Abandoned 1983-01-14
59. Hills Ranch Quarry

    Surface metal/non-metal · Fairfax & Rogers Construction · MSHA ID 0404798
    Abandoned 1986-06-16
60. Hoist Pit

    Surface metal/non-metal · Pacific Clay Products · MSHA ID 0405637
    Abandoned 2005-04-19
61. Hostetter Portable #3

    Surface metal/non-metal · Hostetter Sand & Gravel Inc · MSHA ID 0405649
    Abandoned 2005-07-12
62. Hostetter Sand & Gravel #2

    Surface metal/non-metal · Erik Hostetter Sand & Gravel · MSHA ID 0405544
    Abandoned 2009-11-12
63. Indio Hills Aggregate

    Surface metal/non-metal · Master Sand Materials · MSHA ID 0404957
    Abandoned 1993-08-30
64. J & J Topsoil

    Surface metal/non-metal · J & J Topsoil · MSHA ID 0405145
    Abandoned 1993-01-04
65. J W Sand & Materials

    Surface metal/non-metal · J W Sand & Materials Inc · MSHA ID 0405195
    Abandoned 1993-03-31
66. Juaro Canyon Quarry

    Surface metal/non-metal · L S Hawley Corp · MSHA ID 0404452
    Abandoned 1985-05-07
67. Kasler Rock

    Surface metal/non-metal · Kasler Corp · MSHA ID 0405171
    Abandoned 1993-04-29
68. LAKE ELSINORE

    Surface metal/non-metal · Dan Copp Crushing Corp · MSHA ID 0405269
    Abandoned 1999-05-24
69. Levy Quarries

    Surface metal/non-metal · Levy Quarries · MSHA ID 0404224
    Abandoned 1983-08-01
70. Liston

    Surface metal/non-metal · California Portland Cement Company · MSHA ID 0400557
    Abandoned 1991-02-01
71. Maitri Plant

    Surface metal/non-metal · J F & T Sand Company · MSHA ID 0403762
    Abandoned 1993-07-14
72. Master Sand Materials

    Facility metal/non-metal · Master Sand Materials · MSHA ID 0404293
    Abandoned 1989-12-04
73. Means Construction Company Incorporated

    Surface metal/non-metal · Means Construction Company Inc · MSHA ID 0405022
    Abandoned 1990-03-09
74. Metropolitan Portal Rock Stock-Pile

    Surface metal/non-metal · L S Hawley Corp & Paul Hubbs Construction · MSHA ID 0404451
    Abandoned 1981-01-26
75. Milligan Mine And Mill

    Surface metal/non-metal · Standard Salt & Chemical Company · MSHA ID 0401596
    Abandoned 1982-05-21
76. Mission Mine

    Underground metal/non-metal · Sierra Madre Mineral Development Corp · MSHA ID 0404501
    Abandoned 1982-12-20
77. MOBILE SAND COMPANY

    Surface metal/non-metal · Mobile Sand Company · MSHA ID 0404443
    Abandoned 2000-06-27
78. Moreno Valley Sand & Gravel

    Surface metal/non-metal · Triangle Rock Products Inc · MSHA ID 0403648
    Abandoned 1994-07-05
79. MORONGO PLANT

    Surface metal/non-metal · Triangle Rock Products Inc · MSHA ID 0404826
    Abandoned 1997-08-07
80. Navarro Mine

    Surface metal/non-metal · Navarro Building Stone · MSHA ID 0404223
    Abandoned 1978-04-07
81. NORCO BEACON HILL

    Surface metal/non-metal · Norco Beacon Hill Development Company · MSHA ID 0405328
    Abandoned 1999-05-11
82. North Murrieta

    Surface metal/non-metal · So Cal Sandbags, Inc. · MSHA ID 0405525
    Abandoned 2019-09-24
83. One Thousand Palms Rock Plant

    Surface metal/non-metal · E L Yeager Construction Company Inc · MSHA ID 0404455
    Abandoned 1981-01-26
84. Pacific Clay

    Surface metal/non-metal · Robert R Ford Trucking Inc · MSHA ID 0405420
    Abandoned 2007-11-10
85. Pacific States Plant #1

    Surface metal/non-metal · Pacific States Transportation · MSHA ID 0405534
    Abandoned 2018-10-01
86. Perris Materials Pit

    Surface metal/non-metal · Perris Valley Materials Corp · MSHA ID 0404756
    Abandoned 1986-01-07
87. Perris Valley Material

    Surface metal/non-metal · Perris Valley Materials Corp · MSHA ID 0404750
    Abandoned 1986-06-09
88. PHILADELPHIA RECYCLING MINE

    Surface metal/non-metal · Philadelphia Recycling Mine · MSHA ID 0405066
    Abandoned 2005-02-25
89. Pioneer

    Surface metal/non-metal · Baldi Bros Inc · MSHA ID 0405669
    Abandoned 2006-07-25
90. PLANT #1

    Surface metal/non-metal · Gail Materials Inc · MSHA ID 0405449
    Abandoned 2002-05-29
91. Plant #2

    Surface metal/non-metal · North American Recycling and Crushing, LLC · MSHA ID 0405631
    Abandoned 2014-07-21
92. Plant #3

    Surface metal/non-metal · Gail Materials Inc · MSHA ID 0405434
    Abandoned 2014-02-28
93. Plant #4

    Surface metal/non-metal · Gail Materials Inc · MSHA ID 0405450
    Abandoned 2014-04-07
94. Plant 1

    Surface metal/non-metal · Hard Rock Crushing Services Inc · MSHA ID 0405818
    Abandoned 2011-06-03
95. Plant A

    Surface metal/non-metal · Skanska USA Civil West California District Inc. · MSHA ID 0404962
    Abandoned 2009-04-09
96. Plant A

    Surface metal/non-metal · Barrons Management LLC · MSHA ID 0405716
    Abandoned 2011-03-15
97. Plant A

    Surface metal/non-metal · Titan Crushing · MSHA ID 0405743
    Abandoned 2014-01-09
98. Plata Oro Mine

    Surface metal/non-metal · Neil Monahan · MSHA ID 0404526
    Abandoned 1982-04-21
99. Portable #1

    Surface metal/non-metal · Chandler Aggregates Inc · MSHA ID 0405452
    Abandoned 2014-09-30
100. Portable #1

     Surface metal/non-metal · G.S.I. Inc · MSHA ID 0405543
     Abandoned 2004-04-06
101. Portable #1

     Surface metal/non-metal · CJW Construction, Inc · MSHA ID 0405861
     Abandoned 2013-03-25
102. Portable 1

     Surface metal/non-metal · Orange County Sandbagger · MSHA ID 0405506
     Abandoned 2002-08-05
103. Portable Crusher #1

     Surface metal/non-metal · L&G Portable Crushing and Materials, LLC · MSHA ID 0405883
     Abandoned 2021-09-14
104. Portable Crusher 1

     Surface metal/non-metal · Rentrac Inc · MSHA ID 0405713
     Abandoned 2012-12-01
105. Portable Equipment #2

     Surface metal/non-metal · So Cal Sandbags, Inc. · MSHA ID 0405708
     Abandoned 2007-09-07
106. PORTABLE PLANT #1

     Surface metal/non-metal · C D G Materials Inc · MSHA ID 0405469
     Abandoned 2008-07-08
107. PORTABLE PLANT #2

     Surface metal/non-metal · Hanmer Materials · MSHA ID 0405197
     Abandoned 2004-04-19
108. Portable Plant #3

     Surface metal/non-metal · Superstition Crushing Company · MSHA ID 0405067
     Abandoned 1990-09-04
109. PORTABLE PLANT #3

     Surface metal/non-metal · Hanmer Materials · MSHA ID 0405274
     Abandoned 2006-01-20
110. Portable Plant #4

     Surface metal/non-metal · Hanmer Materials · MSHA ID 0405286
     Abandoned 2016-07-11
111. Portable Plant 1

     Surface metal/non-metal · Maurio Wilson · MSHA ID 0405784
     Abandoned 2009-12-16
112. Portable Plant 2

     Surface metal/non-metal · Wilson Grading · MSHA ID 0405794
     Abandoned 2015-03-30
113. PORTABLE PLANT 2

     Facility metal/non-metal · C D G Materials Inc · MSHA ID 0405470
     Abandoned 2002-03-22
114. Portable Plant 8

     Surface metal/non-metal · North American Recycling and Crushing LLC. · MSHA ID 0405308
     Abandoned 2023-05-17
115. Prado

     Surface metal/non-metal · Owl Rock Products · MSHA ID 0401882
     Abandoned 1994-02-25
116. PRADO

     Surface metal/non-metal · FST Sand & Gravel Inc. · MSHA ID 0405087
     Abandoned 2018-10-01
117. Pyrite Quarry

     Surface metal/non-metal · Stone Valley Materials, LLC · MSHA ID 0404680
     Abandoned 2013-08-20
118. PYRITE QUARRY

     Surface metal/non-metal · Vance Corp · MSHA ID 0405310
     Abandoned 1997-06-18
119. Quandt Borrow Pit

     Surface metal/non-metal · Quandt Materials · MSHA ID 0404650
     Abandoned 1991-06-13
120. Quintana Gypsum Company

     Surface metal/non-metal · Quintana Gypsum Company · MSHA ID 0404276
     Abandoned 1989-03-31
121. R.J.Noble Co.

     Surface metal/non-metal · R.J.Noble Co. · MSHA ID 0405658
     Abandoned 2019-09-10
122. Railroad Canyon D G Pit

     Surface metal/non-metal · Hernandez Trucking · MSHA ID 0404742
     Abandoned 1989-05-04
123. Rainbow Tk Inspection Facility

     Surface metal/non-metal · Vance Corp · MSHA ID 0405152
     Abandoned 1993-10-13
124. Redlands/S-5 Extec

     Surface metal/non-metal · Barney Northcote Inc · MSHA ID 0405594
     Abandoned 2010-10-29
125. Ripley Quarry

     Surface metal/non-metal · Fairfax & Rogers Construction · MSHA ID 0404797
     Abandoned 1988-08-01
126. River Road Sand Job

     Surface metal/non-metal · KEC Engineering · MSHA ID 0405505
     Abandoned 2008-11-28
127. Riverside

     Surface metal/non-metal · A-1 Grit · MSHA ID 0405735
     Abandoned 2016-04-07
128. S-5 PLANT

     Surface metal/non-metal · C D G Materials Inc · MSHA ID 0405329
     Abandoned 2018-07-17
129. S-5 Yellow

     Surface metal/non-metal · Upland Rock · MSHA ID 0405852
     Abandoned 2019-11-01
130. Sand Plant

     Surface metal/non-metal · Cooley Equipment Corp · MSHA ID 0405668
     Abandoned 2007-07-05
131. Sand Portable #1

     Surface metal/non-metal · Del Rio Enterprise Inc · MSHA ID 0405563
     Abandoned 2005-06-15
132. Sanderson Plant

     Surface metal/non-metal · North County Sand & Gravel Inc · MSHA ID 0405235
     Abandoned 1995-08-21
133. Santa Ana River Pit

     Surface metal/non-metal · Riverside Sand Co · MSHA ID 0401927
     Abandoned 1980-06-03
134. SHEPWELLS INC.

     Surface metal/non-metal · Shepwell'S Inc · MSHA ID 0404196
     Abandoned 1998-06-12
135. Smc/Soboba Materials Company

     Surface metal/non-metal · Smc/Soboba Materials Company · MSHA ID 0405078
     Abandoned 1992-11-02
136. Smith Sand

     Surface metal/non-metal · Riverside Cement Company · MSHA ID 0405002
     Abandoned 1992-01-03
137. Soboba Pit

     Surface metal/non-metal · Boral Resources Inc · MSHA ID 0404690
     Abandoned 1992-07-02
138. Soboba Plant

     Surface metal/non-metal · San Jacinto Aggregates Inc · MSHA ID 0404923
     Abandoned 2006-05-17
139. Sweetwater Plant

     Surface metal/non-metal · Nelson & Sloan · MSHA ID 0401868
     Abandoned 1979-07-26
140. Tahquitz Creek Project

     Surface metal/non-metal · E L Yeager Construction Company Inc · MSHA ID 0405123
     Abandoned 1991-02-04
141. Temecula #2

     Surface metal/non-metal · GSI · MSHA ID 0405584
     Abandoned 2005-07-11
142. Temescal Canyon Pit & Mill

     Surface metal/non-metal · Boral Resources Inc · MSHA ID 0403651
     Abandoned 1992-11-02
143. The Rock Plant

     Surface metal/non-metal · Praise The Lord Rock & Sand · MSHA ID 0404668
     Abandoned 1985-05-09
144. TONKCO-HARLOW

     Surface metal/non-metal · Tonkco Corp · MSHA ID 0405341
     Abandoned 1999-03-15
145. Tri-Valley (Chen) Pit

     Surface metal/non-metal · Pacific Clay Products, Inc. · MSHA ID 0405639
     Abandoned 2005-07-30
146. U S Gypsum Claim

     Surface metal/non-metal · Pfizer Inc · MSHA ID 0404498
     Abandoned 1983-03-21
147. U S Site #6 Mine

     Surface metal/non-metal · United States Tile Company · MSHA ID 0405008
     Abandoned 1991-08-01
148. US Rock Corp - Wildomar Pit

     Surface metal/non-metal · US Rock Corporation · MSHA ID 0405904
     Abandoned 2016-05-02
149. White Wing Mine

     Underground metal/non-metal · Ken Pan Ltd · MSHA ID 0404640
     Abandoned 1983-08-11
150. Whitewater

     Surface metal/non-metal · Granite Construction Company · MSHA ID 0404759
     Abandoned 1991-06-01

…and 3 more mines not listed here.

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
• 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
• 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.