Abandoned mines in Maricopa County, Arizona

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   900 27.9%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   1,854 57.5%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   139 4.3%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   322 10.0%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   12 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 B Mine

   Surface metal/non-metal · Adamic Materials Inc · MSHA ID 0203180
   Abandoned 2007-07-11
2. 1018 Old Coolidge

   Surface metal/non-metal · Arcosa Aggregates West, LLC. · MSHA ID 0203192
   Abandoned 2024-08-24
3. 115th & Rose Garden

   Surface metal/non-metal · Pioneer Sand Company · MSHA ID 0202402
   Abandoned 1990-07-05
4. 19th Avenue

   Surface metal/non-metal · US CRUSHING INC · MSHA ID 0203169
   Abandoned 2007-12-31
5. 24th Street Pit

   Surface metal/non-metal · Union Rock & Materials Corp · MSHA ID 0200709
   Abandoned 1979-08-13
6. 27w Portable

   Surface metal/non-metal · Sunward Materials · MSHA ID 0202541
   Abandoned 1992-09-14
7. 28-C Portable

   Surface metal/non-metal · Sunward Materials · MSHA ID 0202554
   Abandoned 1995-07-10
8. 29c Portable

   Surface metal/non-metal · Sunward Materials · MSHA ID 0202542
   Abandoned 1993-10-07
9. 50c Portable

   Surface metal/non-metal · Sunward Materials · MSHA ID 0202540
   Abandoned 1995-03-23
10. 51st Ave. Plant 35

    Surface metal/non-metal · Martin Marietta Materials, Inc · MSHA ID 0202611
    Abandoned 2012-02-17
11. 59TH AVE. PLANT #44

    Surface metal/non-metal · Hanson Aggregates Of Arizona Inc · MSHA ID 0202469
    Abandoned 2003-09-23
12. 59th Avenue Plant

    Surface metal/non-metal · Union Rock & Materials Corp · MSHA ID 0200993
    Abandoned 1986-03-17
13. 7 Springs Onyx Mine

    Surface metal/non-metal · Western States Stone Company · MSHA ID 0201631
    Abandoned 1988-07-20
14. 71-09

    Surface metal/non-metal · Fnf Construction Inc · MSHA ID 0202536
    Abandoned 2001-12-10
15. A & B Sand & Rock

    Surface metal/non-metal · A & B Sand & Rock · MSHA ID 0202330
    Abandoned 1993-07-20
16. Aggregate Plant

    Surface metal/non-metal · Ebasco-Losinger J/V · MSHA ID 0202533
    Abandoned 1992-10-03
17. Agua Fria Pit

    Surface metal/non-metal · National Sand & Gravel Company · MSHA ID 0201679
    Abandoned 1981-09-25
18. Agua Fria Sand And Rock Incorporated

    Surface metal/non-metal · Agua Fria Sand & Rock Inc · MSHA ID 0201618
    Abandoned 1982-11-03
19. Ajax Sand & Rock

    Surface metal/non-metal · Ajax Contracting Company Inc · MSHA ID 0202163
    Abandoned 1992-02-18
20. Alma School Landfill Incorporated

    Surface metal/non-metal · Alma School Landfill Inc · MSHA ID 0202347
    Abandoned 1987-05-20
21. Amcon West Operation

    Surface metal/non-metal · Amcon Materials Company Inc · MSHA ID 0202206
    Abandoned 1984-11-05
22. American Sand and Rock Catclaw Mine

    Surface metal/non-metal · American Sand and Rock Inc · MSHA ID 0202990
    Abandoned 2018-05-14
23. Apache Gold Boulder Mine

    Surface metal/non-metal · Arizona Natural Gold Excavation & Reclamation Inc · MSHA ID 0203161
    Abandoned 2008-11-19
24. Apache Gold Boulder Mine

    Surface metal/non-metal · Stodghill and Sons Mining, LLC · MSHA ID 0203361
    Abandoned 2022-08-10
25. Aqua Fria

    Surface metal/non-metal · Cave Creek Sand & Gravel Inc · MSHA ID 0202409
    Abandoned 1988-11-22
26. Arizona Asphalt & Rock Products

    Surface metal/non-metal · Arizona Asphalt & Rock Products · MSHA ID 0202117
    Abandoned 1985-01-24
27. Arizona Crusher

    Surface metal/non-metal · KBO LLC · MSHA ID 0203123
    Abandoned 2010-08-16
28. Arizona Crushers Incorporated

    Surface metal/non-metal · Arizona Crushers Inc · MSHA ID 0201908
    Abandoned 1992-01-28
29. Arizona'S Quality Granite

    Surface metal/non-metal · Arizona'S Quality Granite · MSHA ID 0202125
    Abandoned 1993-08-27
30. Art Barber Excavating

    Facility metal/non-metal · Art Barber Excavating · MSHA ID 0203517
    Abandoned 2025-02-06
31. Atta-Boy

    Surface metal/non-metal · Aero Mining Ltd · MSHA ID 0202438
    Abandoned 1989-03-16
32. Avondale Plant #69 Or Plant #69

    Surface metal/non-metal · Calmat Company Of Arizona · MSHA ID 0201073
    Abandoned 1990-08-14
33. Azco Mica Plant

    Surface metal/non-metal · Azco Mica Inc · MSHA ID 0202890
    Abandoned 2002-12-09
34. Aztec Mining

    Surface metal/non-metal · Aztec Mining · MSHA ID 0203006
    Abandoned 2009-06-12
35. B L Gustafson Materials

    Surface metal/non-metal · B L Gustafson Materials · MSHA ID 0202189
    Abandoned 1987-03-19
36. Big Horn Mine

    Surface metal/non-metal · Roddy Resources (Arizona) Inc · MSHA ID 0202285
    Abandoned 1990-09-06
37. Big Red

    Surface metal/non-metal · Riggs Resources · MSHA ID 0202228
    Abandoned 1992-03-12
38. Black Hawk

    Surface metal/non-metal · Inter American Mine Development Inc · MSHA ID 0202236
    Abandoned 1985-03-29
39. Black Hawk Gold

    Surface metal/non-metal · Mc Farland & Hullinger · MSHA ID 0202198
    Abandoned 1987-01-06
40. Buckeye Farms

    Surface metal/non-metal · Rinker Materials · MSHA ID 0203134
    Abandoned 2006-08-24
41. Buckeye Hills Plant

    Surface metal/non-metal · Kilauea Crushers Inc · MSHA ID 0203209
    Abandoned 2019-08-27
42. Buckeye Mill

    Facility metal/non-metal · Buckeye Mica Co · MSHA ID 0200753
    Abandoned 1978-05-12
43. Buckeye Plant #24

    Surface metal/non-metal · Phoenix San-Man Inc · MSHA ID 0203229
    Abandoned 2012-01-23
44. Buckeye Sand & Gravel

    Surface metal/non-metal · Buckeye Sand & Gravel · MSHA ID 0202681
    Abandoned 2008-10-03
45. Bullard

    Surface metal/non-metal · CalPortland Company · MSHA ID 0203082
    Abandoned 2012-02-17
46. Cave Creek

    Surface metal/non-metal · Cave Creek Sand & Gravel Inc · MSHA ID 0202408
    Abandoned 1988-11-22
47. Cave Creek Quarry

    Surface metal/non-metal · Lafarge North America Inc · MSHA ID 0202388
    Abandoned 2008-10-21
48. Cave Creek Sand & Gravel

    Surface metal/non-metal · Baseline Materials Inc · MSHA ID 0202463
    Abandoned 1990-01-29
49. CCC MINES, LLC

    Surface metal/non-metal · Ccc Mines Llc · MSHA ID 0202841
    Abandoned 2001-10-01
50. CEMEX - 107TH AVE PLANT

    Surface metal/non-metal · CEMEX Construction Materials South LLC · MSHA ID 0203055
    Abandoned 2010-03-25
51. CEMEX - 59TH AVENUE

    Surface metal/non-metal · CEMEX Construction Materials South LLC · MSHA ID 0202998
    Abandoned 2009-12-09
52. CEMEX - BARD RANCH

    Surface metal/non-metal · CEMEX Construction Materials South LLC · MSHA ID 0202887
    Abandoned 2011-01-13
53. CEMEX - BEELINE

    Surface metal/non-metal · CEMEX Construction Materials South LLC · MSHA ID 0200711
    Abandoned 2011-03-14
54. CEMEX - BUCKEYE

    Surface metal/non-metal · CEMEX Construction Materials South LLC · MSHA ID 0202993
    Abandoned 2010-11-18
55. CEMEX - EL MIRAGE

    Surface metal/non-metal · CEMEX Construction Materials South LLC · MSHA ID 0202003
    Abandoned 2006-04-11
56. CEMEX - EL MIRAGE

    Surface metal/non-metal · CEMEX Construction Materials South LLC · MSHA ID 0202875
    Abandoned 2008-10-06
57. CEMEX - GLENDALE

    Surface metal/non-metal · CEMEX Construction Materials South LLC · MSHA ID 0200720
    Abandoned 2011-01-13
58. CEMEX - HASSAYAMPA

    Surface metal/non-metal · CEMEX Construction Materials South LLC · MSHA ID 0202971
    Abandoned 2008-10-06
59. CEMEX - JOMAX

    Surface metal/non-metal · CEMEX Construction Materials South LLC · MSHA ID 0202917
    Abandoned 2009-02-26
60. CEMEX - LEHI PORTABLE

    Surface metal/non-metal · CEMEX Construction Materials South LLC · MSHA ID 0202624
    Abandoned 2006-09-30
61. CEMEX - MESA

    Surface metal/non-metal · CEMEX Construction Materials South LLC · MSHA ID 0200664
    Abandoned 2010-11-09
62. CEMEX - SUN CITY

    Surface metal/non-metal · CEMEX Construction Materials South LLC · MSHA ID 0202412
    Abandoned 2018-03-05
63. CEMEX - WEST PLANT #72

    Surface metal/non-metal · CEMEX Construction Materials South LLC · MSHA ID 0201037
    Abandoned 2025-01-20
64. Center Street Plant #25

    Surface metal/non-metal · Calmat Company Of Arizona · MSHA ID 0200628
    Abandoned 1990-08-14
65. Century Materials Plant #2

    Surface metal/non-metal · Century Materials Inc · MSHA ID 0202299
    Abandoned 1989-01-26
66. Century Materials-Plant 4

    Surface metal/non-metal · Century Materials Inc · MSHA ID 0202378
    Abandoned 1990-07-09
67. CHANDLER READY MIX - MINE #3

    Surface metal/non-metal · Chandler Ready Mix Inc · MSHA ID 0202757
    Abandoned 1999-03-17
68. Chandler Ready Mix Incorporated

    Surface metal/non-metal · Chandler Ready Mix Inc · MSHA ID 0201153
    Abandoned 1980-01-29
69. CHANDLER READY MIX-MINE #1

    Surface metal/non-metal · Chandler Ready Mix Inc · MSHA ID 0201892
    Abandoned 2001-06-11
70. Cherokee Rock

    Surface metal/non-metal · Sunwalker Development Inc · MSHA ID 0202563
    Abandoned 1993-08-30
71. Circle H Sand & Rock

    Surface metal/non-metal · Circle H Sand & Rock · MSHA ID 0203005
    Abandoned 2017-10-25
72. Clementine Mine

    Facility metal/non-metal · Copper Lake Explorations Inc · MSHA ID 0202030
    Abandoned 1983-02-22
73. Connect 202 Partners LLC

    Surface metal/non-metal · Connect 202 Partners LLC · MSHA ID 0203388
    Abandoned 2018-09-05
74. Cotton Lane Pit

    Surface metal/non-metal · W R Skousen Contractor Inc · MSHA ID 0201847
    Abandoned 1978-07-27
75. COUNTRY CLUB PIT

    Surface metal/non-metal · J A Materials · MSHA ID 0202669
    Abandoned 2002-02-05
76. Crusher #1

    Surface metal/non-metal · Granite Express LLC · MSHA ID 0203084
    Abandoned 2020-02-03
77. CRUSHER #1

    Facility metal/non-metal · Kiewit Western Company · MSHA ID 0201939
    Abandoned 2001-07-03
78. CRUSHER #2

    Surface metal/non-metal · Kiewit Western Company · MSHA ID 0200718
    Abandoned 2003-06-02
79. Crusher #23

    Surface metal/non-metal · Superstition Crushing L.L.C. · MSHA ID 0202610
    Abandoned 2007-08-22
80. CRUSHER #3

    Surface metal/non-metal · Kiewit Western Company · MSHA ID 0202222
    Abandoned 2000-12-20
81. Crusher No 1

    Surface metal/non-metal · J W J Contracting Company Inc · MSHA ID 0202454
    Abandoned 1994-08-22
82. Dakota Blender

    Surface metal/non-metal · Pioneer Sand Company · MSHA ID 0203249
    Abandoned 2015-10-01
83. Dean Road Property

    Surface metal/non-metal · Fort McDowell Yavapai Materials · MSHA ID 0202950
    Abandoned 2003-07-15
84. Deer Valley Granite

    Surface metal/non-metal · Deer Valley Granite · MSHA ID 0202015
    Abandoned 1983-05-24
85. Deer Valley Mine

    Surface metal/non-metal · C & M Trucking & Materials · MSHA ID 0202195
    Abandoned 1988-08-22
86. Desert Pit

    Surface metal/non-metal · Desert Supplies · MSHA ID 0201663
    Abandoned 1979-07-30
87. DESERT ROSE SILICA SAND

    Surface metal/non-metal · Golden Sunset Mining & Milling Company Llc · MSHA ID 0202862
    Abandoned 2003-09-19
88. DIXILETA PIT

    Surface metal/non-metal · W C I Mining Llc · MSHA ID 0202702
    Abandoned 2007-06-18
89. Dobson Plant

    Surface metal/non-metal · Salt River Sand & Rock · MSHA ID 0202613
    Abandoned 2024-04-01
90. Drake Mobile

    Surface metal/non-metal · Drake Materials · MSHA ID 0203360
    Abandoned 2017-10-23
91. Drake Mobile Crusher

    Surface metal/non-metal · Sunshine Concrete & Materials Inc dba Drake Materi · MSHA ID 0203427
    Abandoned 2026-08-14
92. El-Jay Crusher

    Surface metal/non-metal · D C Speer Construction Company · MSHA ID 0201868
    Abandoned 1982-12-07
93. El-Jay Portable Cone Crusher

    Surface metal/non-metal · Ashton Company Inc · MSHA ID 0202173
    Abandoned 1984-12-05
94. Enserch Waddell Screening Plant

    Surface metal/non-metal · Enserch Construction · MSHA ID 0202483
    Abandoned 1989-12-01
95. Eq#70-00 Soil Stablztn Pl Pioneer S/N 42

    Surface metal/non-metal · Fnf Mining · MSHA ID 0202553
    Abandoned 1991-05-01
96. Eq#71-01 Lj 1213 Ptbl Crshg/Scrng Pl S/N

    Surface metal/non-metal · Fnf Mining · MSHA ID 0202360
    Abandoned 1991-05-30
97. Eq#71-04 Impact Crusher Canica S/N 9526c

    Surface metal/non-metal · Fnf Mining · MSHA ID 0202552
    Abandoned 1991-05-01
98. Eq#71-10

    Facility metal/non-metal · Fnf Mining · MSHA ID 0202595
    Abandoned 1993-08-19
99. Eq#79-01 Eljay 1320 Screening Plant S/N

    Surface metal/non-metal · Fnf Mining · MSHA ID 0202550
    Abandoned 1994-04-11
100. Eskco Sand And Gravel Pit

     Surface metal/non-metal · Edward S Kelton Contracting Company Inc · MSHA ID 0200653
     Abandoned 1987-08-15
101. Estrella

     Surface metal/non-metal · Kilauea Crushers Inc · MSHA ID 0203002
     Abandoned 2008-02-07
102. Estrella Mountain

     Surface metal/non-metal · Southwest Rock Products · MSHA ID 0203130
     Abandoned 2006-09-18
103. Evans Equipment Rental

     Surface metal/non-metal · Evans Equipment Rental · MSHA ID 0202229
     Abandoned 1985-03-22
104. Everlasting Shall Be Mine Of Eden

     Surface metal/non-metal · E V E Mining Enterprise · MSHA ID 0202234
     Abandoned 1985-05-15
105. Fancher

     Underground metal/non-metal · Luxcor Gold LP · MSHA ID 0203232
     Abandoned 2013-07-02
106. Far West Farms

     Surface metal/non-metal · Far West Farms LLC · MSHA ID 0203119
     Abandoned 2006-05-23
107. Fisher Industries Plant 28

     Surface metal/non-metal · Fisher Sand & Gravel Co. · MSHA ID 3200732
     Abandoned 2024-10-18
108. Florence Sunshine Concrete and Materials

     Surface metal/non-metal · Drake Materials · MSHA ID 0203319
     Abandoned 2023-11-08
109. FNF Crushing 7

     Surface metal/non-metal · FNF Construction Inc · MSHA ID 0203079
     Abandoned 2018-07-26
110. Forpaugh Mill

     Facility metal/non-metal · James R Mc Coll Partnership · MSHA ID 0202180
     Abandoned 1987-11-24
111. Fort Mc Dowell Yavapai Materials-Plt #7

     Surface metal/non-metal · Fort Mc Dowell Yavapai Materials · MSHA ID 0202696
     Abandoned 2010-11-18
112. FOUR PEAKS MINING DISTRICT

     Underground metal/non-metal · Four Peaks Mining Company Llc · MSHA ID 0202798
     Abandoned 2010-01-15
113. George Washington Mine

     Underground metal/non-metal · D M C Mining Inc · MSHA ID 0202444
     Abandoned 1989-02-28
114. Gila Bend Pit And Plant

     Surface metal/non-metal · Gila Ready Mix · MSHA ID 0200657
     Abandoned 1980-03-04
115. Gila Bend Plant #3 (Portable)

     Surface metal/non-metal · Western Sand & Rock · MSHA ID 0202481
     Abandoned 1995-09-05
116. Gila Bend Wash Plant

     Surface metal/non-metal · Drake Materials · MSHA ID 0203290
     Abandoned 2013-01-02
117. Gila Sand & Rock

     Surface metal/non-metal · Gila Sand & Rock · MSHA ID 0202994
     Abandoned 2004-04-22
118. Gillespie

     Surface metal/non-metal · Mission Materials · MSHA ID 0203210
     Abandoned 2010-04-28
119. Glendale Pit

     Surface metal/non-metal · Cemex Construction Materials LP · MSHA ID 0203059
     Abandoned 2007-08-29
120. Glendale Plant

     Surface metal/non-metal · MDI Rock · MSHA ID 0203182
     Abandoned 2014-09-23
121. Gold Belt

     Underground metal/non-metal · Robert E White Construction · MSHA ID 0202564
     Abandoned 1993-05-13
122. Gold Bug

     Surface metal/non-metal · Gold Bug Mining & Minerals Inc · MSHA ID 0202064
     Abandoned 1982-07-21
123. Goldfield Mine

     Surface metal/non-metal · Triple S Mining Company · MSHA ID 0201874
     Abandoned 1982-10-20
124. Goodyear Wash Plant #13

     Surface metal/non-metal · Phoenix San-Man · MSHA ID 0202878
     Abandoned 2011-01-06
125. Gosney & Sons Incorporated

     Surface metal/non-metal · Gosney & Sons Inc · MSHA ID 0202323
     Abandoned 1987-05-07
126. Got Rock 2

     Surface metal/non-metal · J & D Excavators Inc · MSHA ID 0203205
     Abandoned 2010-06-17
127. Greywolf #5

     Surface metal/non-metal · Weary Bones Inc · MSHA ID 0202284
     Abandoned 1987-11-09
128. Hank's Pit

     Surface metal/non-metal · Weston Concrete and Materials, Inc. · MSHA ID 0203240
     Abandoned 2009-07-27
129. Happy Valley Quarry

     Surface metal/non-metal · Lafarge North America Inc · MSHA ID 0202803
     Abandoned 2010-03-17
130. Harper Sand & Rock

     Surface metal/non-metal · Harper Sand & Rock · MSHA ID 0202389
     Abandoned 1990-03-07
131. Harris Granite

     Surface metal/non-metal · Harris Granite Company · MSHA ID 0201937
     Abandoned 1982-10-13
132. Harris Granite Company

     Surface metal/non-metal · Harris Granite Company · MSHA ID 0201851
     Abandoned 1980-08-11
133. Harris Granite Incorporated

     Surface metal/non-metal · Harris Granite Company · MSHA ID 0202278
     Abandoned 1988-08-02
134. Hassayampa Plant #10

     Surface metal/non-metal · Phoenix San-Man · MSHA ID 0203086
     Abandoned 2011-06-13
135. Higley

     Surface metal/non-metal · WestRock, LLC. · MSHA ID 0203341
     Abandoned 2015-03-12
136. Higley Road Pit

     Surface metal/non-metal · Arizona Crushing Company · MSHA ID 0201642
     Abandoned 1979-12-10
137. Higley Wash Plant

     Surface metal/non-metal · Holcim-WCR, Inc · MSHA ID 0203323
     Abandoned 2023-11-02
138. Hillside Mine

     Surface metal/non-metal · Hillside Mining Company · MSHA ID 0201633
     Abandoned 1980-02-27
139. Hintze Development Company Incorporated

     Surface metal/non-metal · Hintze Development Company Inc · MSHA ID 0201878
     Abandoned 1980-04-18
140. Horseshoe

     Surface metal/non-metal · Arizona Zinc Platers Inc · MSHA ID 0202348
     Abandoned 1988-02-12
141. HUNTER PORTABLE

     Surface metal/non-metal · Cemex Construction Materials LP · MSHA ID 0202941
     Abandoned 2004-09-01
142. Ideak Rock Products

     Surface metal/non-metal · Ideal Concrete Corp · MSHA ID 0202362
     Abandoned 1988-04-28
143. Ideal Rock Products (Portable Plant)

     Surface metal/non-metal · Ideal Concrete Corp · MSHA ID 0202381
     Abandoned 1988-01-05
144. Indian Springs Plant

     Surface metal/non-metal · Spartan Industries,LLC · MSHA ID 0203160
     Abandoned 2007-09-13
145. ISSI Arizona Inc

     Surface metal/non-metal · International Separation Systems Arizona, Inc. · MSHA ID 0202951
     Abandoned 2002-06-14
146. Jack Rabbit

     Surface metal/non-metal · Lafarge North America, Inc · MSHA ID 0203213
     Abandoned 2010-08-18
147. Jckellips Road Plant

     Surface metal/non-metal · Bigelow Enterprise · MSHA ID 0201899
     Abandoned 1979-02-15
148. Johnson Granite

     Surface metal/non-metal · Johnson Granite · MSHA ID 0201879
     Abandoned 1984-04-10
149. Jomax Granite

     Surface metal/non-metal · Jomax · MSHA ID 0202602
     Abandoned 1994-05-19
150. Jomax Plant 2

     Surface metal/non-metal · Kilauea Crushers Inc · MSHA ID 0202693
     Abandoned 2008-11-06

…and 165 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.

• Mohave County 5,749
• La Paz County 5,030
• Pima County 4,684
• Yavapai County 3,585
• Gila County 3,401
• Pinal County 3,289
• Cochise County 3,108
• Yuma County 1,743
• Santa Cruz County 1,696
• Coconino County 1,397
• Greenlee County 1,312
• Graham County 656

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.