Abandoned mines in Clark County, Nevada

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   1,847 34.3%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   3,004 55.7%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   74 1.4%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   423 7.8%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   44 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. 1897 Portable

   Surface metal/non-metal · Rinker Materials West LLC · MSHA ID 2602574
   Abandoned 2007-12-04
2. 480TEL

   Surface metal/non-metal · Chase Crushing · MSHA ID 2602290
   Abandoned 2016-04-12
3. 710

   Surface metal/non-metal · American Asphalt & Grading Company · MSHA ID 2602251
   Abandoned 1996-09-30
4. A & A Landscaping

   Surface metal/non-metal · A & A Landscaping · MSHA ID 2602178
   Abandoned 1991-07-08
5. A A & G Portable #1

   Surface metal/non-metal · American Asphalt & Grading Co · MSHA ID 2602372
   Abandoned 2007-10-05
6. AA&G Crushing Portable #3

   Surface metal/non-metal · American Asphalt & Grading Co. · MSHA ID 2602496
   Abandoned 2003-01-03
7. AA&G Portable #3

   Surface metal/non-metal · American Asphalt & Grading Co · MSHA ID 2602513
   Abandoned 2006-04-17
8. Acclaro

   Surface metal/non-metal · Acclaro LLC · MSHA ID 2602856
   Abandoned 2020-10-01
9. AIRWAY, INC

   Surface metal/non-metal · Airway Inc · MSHA ID 2602038
   Abandoned 2003-12-31
10. ALL STAR WASH PLANT

    Surface metal/non-metal · Pacific Western Aggregate Corp · MSHA ID 2602340
    Abandoned 1999-01-29
11. ALL STATE SAND & GRAVEL, INC.

    Surface metal/non-metal · All State Sand & Gravel Inc · MSHA ID 2602215
    Abandoned 2001-03-05
12. Ambrosia

    Facility metal/non-metal · Ambrosia Mining Company Inc · MSHA ID 2602208
    Abandoned 1992-08-03
13. Apex Pit

    Surface metal/non-metal · Granite Construction Company · MSHA ID 2602329
    Abandoned 2008-09-05
14. Apex Quarry

    Surface metal/non-metal · CEMEX · MSHA ID 2602621
    Abandoned 2009-03-10
15. Arena Negra

    Surface metal/non-metal · Arena Negra Inc · MSHA ID 2602049
    Abandoned 1988-08-26
16. Arrow Ready Mix Pit And Mill

    Surface metal/non-metal · Arrow Ready Mix Concrete · MSHA ID 2600722
    Abandoned 1984-08-15
17. Aztec Mine (Portable III)

    Surface metal/non-metal · Silver State Transportation, Inc. · MSHA ID 2602515
    Abandoned 2003-02-15
18. Balt 22

    Surface metal/non-metal · Consolidated Mineral Management Corp · MSHA ID 2601974
    Abandoned 1988-02-17
19. BLACK MOUNTAIN REFINERY

    Facility metal/non-metal · Phoenix Metals Usa Ii Inc · MSHA ID 2601989
    Abandoned 2002-06-10
20. BLM Denton Pit

    Surface metal/non-metal · Huntington Equipment Inc · MSHA ID 2602514
    Abandoned 2009-09-10
21. Blm Lone Mountain Pit

    Surface metal/non-metal · Crenshaw Backhoe Service · MSHA ID 2602169
    Abandoned 1992-10-10
22. Blm Pit

    Surface metal/non-metal · Wesley Corp · MSHA ID 2602088
    Abandoned 1992-11-30
23. Blossom

    Surface metal/non-metal · Gold Standard Mines · MSHA ID 2602403
    Abandoned 2003-09-10
24. BLUE DIAMOND MATERIALS, INC.

    Surface metal/non-metal · Rinker Materials West Llc · MSHA ID 2602264
    Abandoned 2001-12-01
25. Bobs Construction Sand & Gravel

    Surface metal/non-metal · Bobs Construction Sand & Gravel · MSHA ID 2602075
    Abandoned 1995-10-30
26. BOOTLEG CANYON RES.

    Surface metal/non-metal · Boulder Sand & Gravel Inc · MSHA ID 2601972
    Abandoned 2007-12-31
27. Bootleg Pit And Mill

    Surface metal/non-metal · City Of Boulder City · MSHA ID 2601048
    Abandoned 1979-09-11
28. BOSS MINE

    Surface metal/non-metal · Wilkins Ore Processing · MSHA ID 2602411
    Abandoned 2001-03-05
29. BOSS SAND AND ROCK, INC.

    Surface metal/non-metal · Boss Sand & Rock Inc · MSHA ID 2602402
    Abandoned 2003-04-09
30. BOULDER CITY DETENTION POND

    Surface metal/non-metal · Dbe Excavating Inc · MSHA ID 2602230
    Abandoned 1998-07-29
31. Bruce Greer Summerlin Plant

    Surface metal/non-metal · Bruce Greer Construction · MSHA ID 2602092
    Abandoned 1989-03-01
32. BUFFALO RD PIT & MILL

    Surface metal/non-metal · Rinker Materials West Llc · MSHA ID 2600458
    Abandoned 2003-12-23
33. BULLDOG CRUSHER

    Surface metal/non-metal · Bulldog Equipment Company · MSHA ID 2602362
    Abandoned 2001-06-01
34. Bunkerville Nevada

    Surface metal/non-metal · Sunroc Corporation · MSHA ID 2602435
    Abandoned 2019-03-21
35. Cactus Pit

    Surface metal/non-metal · Rocktek Crushing · MSHA ID 2602610
    Abandoned 2008-12-17
36. CACTUS SAND & GRAVEL

    Surface metal/non-metal · Western States Contracting · MSHA ID 2602333
    Abandoned 2003-03-12
37. Campbird

    Surface metal/non-metal · Intermountain Exploration Company · MSHA ID 2601419
    Abandoned 1984-07-10
38. Canyon Sand

    Surface metal/non-metal · Canyon Sand Inc · MSHA ID 2602171
    Abandoned 1991-03-26
39. Capital Trading Mill

    Facility metal/non-metal · Capital Trading Corp International · MSHA ID 2601881
    Abandoned 1986-04-15
40. Capitol Mill

    Facility metal/non-metal · British Americian Mining Corp · MSHA ID 2601928
    Abandoned 1986-04-29
41. Capitol Mill

    Facility metal/non-metal · Mining & Milling Corp Of America · MSHA ID 2602023
    Abandoned 1987-08-17
42. Capitol Mine

    Surface metal/non-metal · British Americian Mining Corp · MSHA ID 2601927
    Abandoned 1986-04-29
43. Cedar Rapids #1

    Surface metal/non-metal · Reynolds Construction · MSHA ID 2601995
    Abandoned 1988-07-05
44. CEDAR RAPIDS PORTABLE

    Surface metal/non-metal · R L M Aggregate Materials Inc · MSHA ID 2602349
    Abandoned 2003-02-24
45. Cedarapids JCI Crusher 750

    Surface metal/non-metal · Hollywood Gravel Company Limited Partnership · MSHA ID 2602071
    Abandoned 2011-01-01
46. Charleston #7

    Surface metal/non-metal · Southern Nevada Paving · MSHA ID 2602478
    Abandoned 2005-09-19
47. CHARLIE BROWN PIT & MILL

    Surface metal/non-metal · Charlie Brown Construction · MSHA ID 2600866
    Abandoned 2009-03-23
48. Clark County Gravel Pits

    Surface metal/non-metal · Clark County Road Department · MSHA ID 2600006
    Abandoned 1979-09-11
49. Cmc Of Nevada Incorporated

    Surface metal/non-metal · C M Concepts Of Nevada Inc · MSHA ID 2602173
    Abandoned 1991-07-24
50. Cone Crusher #1

    Surface metal/non-metal · Capriati Construction Corp · MSHA ID 2602598
    Abandoned 2011-01-01
51. Construx Aggregates

    Surface metal/non-metal · Calportland · MSHA ID 2602322
    Abandoned 2011-10-18
52. COUNTY FAIRE TEMP GRAVEL PIT

    Surface metal/non-metal · PAPA'S DIRT WORKES · MSHA ID 2602570
    Abandoned 2006-04-17
53. Coyote Blossom Mine

    Underground metal/non-metal · Nevada Milling & Mining, LLC · MSHA ID 2602745
    Abandoned 2015-08-07
54. COYOTE MINING NEVADA L.L.C.

    Surface metal/non-metal · Coyote Mining Nevada Llc · MSHA ID 2602360
    Abandoned 1999-08-24
55. Coyote Springs Detention Basin

    Surface metal/non-metal · Las Vegas Paving Corp. · MSHA ID 2602695
    Abandoned 2011-03-22
56. Crescent Peak Project

    Surface metal/non-metal · Crescent Peak Quarries · MSHA ID 2602541
    Abandoned 2006-10-17
57. Crow 19 20 21

    Underground metal/non-metal · Ronald R Graham · MSHA ID 2602029
    Abandoned 1992-07-10
58. CRUSHER

    Surface metal/non-metal · Lake Mead Constructors · MSHA ID 2602388
    Abandoned 2000-03-03
59. Crusher # 3

    Surface metal/non-metal · Heavy Duty an LLC · MSHA ID 2602581
    Abandoned 2006-12-20
60. Crusher #1

    Surface metal/non-metal · Diamond Construction · MSHA ID 2602315
    Abandoned 2008-09-05
61. Crusher #1

    Surface metal/non-metal · Cedar Aggregates LLC · MSHA ID 2602348
    Abandoned 2006-08-15
62. CRUSHER #1

    Surface metal/non-metal · Leavitt Ready Mix · MSHA ID 2601980
    Abandoned 2002-07-09
63. Crusher #2

    Surface metal/non-metal · Diamond Construction · MSHA ID 2602316
    Abandoned 2010-03-03
64. CRUSHER #2

    Surface metal/non-metal · Lawrimore Trucking Incorporated · MSHA ID 2602365
    Abandoned 2002-10-30
65. Crusher #3

    Surface metal/non-metal · Diamond Construction · MSHA ID 2602341
    Abandoned 2010-03-03
66. Crusher #4

    Surface metal/non-metal · Diamond Construction · MSHA ID 2602392
    Abandoned 2008-09-05
67. Crusher #5

    Surface metal/non-metal · Diamond Construction Inc. · MSHA ID 2602488
    Abandoned 2003-06-25
68. Crusher 712

    Surface metal/non-metal · American Asphalt Inc · MSHA ID 2602150
    Abandoned 2005-09-21
69. Crystal Ridge

    Surface metal/non-metal · Bardon Materials · MSHA ID 2602628
    Abandoned 2009-03-02
70. CTC Crushing Portable

    Surface metal/non-metal · CTC Crushing LLC · MSHA ID 2602405
    Abandoned 2008-03-19
71. Ddc Pit 1

    Surface metal/non-metal · Dimick Development Company · MSHA ID 2602166
    Abandoned 1992-11-30
72. DEL WEBB PIT

    Surface metal/non-metal · Western States Contracting · MSHA ID 2602332
    Abandoned 1999-04-12
73. Delores Mine

    Facility metal/non-metal · National Pacific Commodities Company · MSHA ID 2601778
    Abandoned 1982-02-01
74. Deposit No Cl 83-9

    Surface metal/non-metal · Meadow Valley Contractors · MSHA ID 2602191
    Abandoned 1992-01-27
75. Desert Aggregates Plant #1

    Surface metal/non-metal · Desert Aggregates LLC · MSHA ID 2602662
    Abandoned 2010-10-20
76. Desert Ready Mix

    Surface metal/non-metal · Desert Ready Mix · MSHA ID 2602183
    Abandoned 1992-08-26
77. Duncan Mine

    Facility metal/non-metal · Silver Unicorn Limited · MSHA ID 2601780
    Abandoned 1982-04-05
78. Durango Pit

    Surface metal/non-metal · Western States Contracting, Inc. · MSHA ID 2602486
    Abandoned 2010-08-01
79. Dwight Patent Mine

    Surface metal/non-metal · Dwight Patent 10945 Mining LLC · MSHA ID 2602820
    Abandoned 2019-04-01
80. E X T E C

    Surface metal/non-metal · R L M Aggregate Materials Inc · MSHA ID 2602294
    Abandoned 2003-02-19
81. East Pit

    Surface metal/non-metal · Bonanza Materials Inc · MSHA ID 2602018
    Abandoned 1988-03-31
82. Egan Crest & Severance Pit

    Surface metal/non-metal · Heavy Duty an LLC · MSHA ID 2602654
    Abandoned 2010-06-04
83. El Dorado / 1893 Portable Crusher

    Surface metal/non-metal · Rinker Materials West, LLC · MSHA ID 2602590
    Abandoned 2008-09-03
84. El Dorado Quarry

    Surface metal/non-metal · CEMEX Construction Materials Pacific LLC · MSHA ID 2602278
    Abandoned 2009-10-05
85. Eldorado

    Surface metal/non-metal · Eldorado Granite Products · MSHA ID 2602252
    Abandoned 1995-03-23
86. Eldorado Placer

    Surface metal/non-metal · Zzyzx Mining Corp · MSHA ID 2602021
    Abandoned 1988-08-23
87. Eldorado Project

    Surface metal/non-metal · Cactus Mining Corporation · MSHA ID 2602127
    Abandoned 2007-07-12
88. Equipment 711

    Surface metal/non-metal · American Asphalt & Grading Company · MSHA ID 2602192
    Abandoned 1992-10-02
89. Era Mill

    Facility metal/non-metal · Mountain Gold Inc · MSHA ID 2602044
    Abandoned 1988-05-04
90. ERTEC PORTABLE

    Surface metal/non-metal · R L M Aggregate Materials Inc · MSHA ID 2602416
    Abandoned 2003-02-19
91. Extec Portable

    Surface metal/non-metal · John A. Yeager · MSHA ID 2602559
    Abandoned 2010-05-18
92. Extec Turbo 735

    Surface metal/non-metal · Hollywood Gravel Company LP · MSHA ID 2602309
    Abandoned 2004-05-04
93. Extec/Pegison Portable

    Surface metal/non-metal · Nevada Crushing & Screening Co Inc · MSHA ID 2602526
    Abandoned 2005-04-06
94. F K C Portable

    Surface metal/non-metal · F K C Inc · MSHA ID 2602161
    Abandoned 1991-06-14
95. Fargo Pacific Rock & Sand Mine

    Surface metal/non-metal · Fargo Pacific Rock & Sand Inc · MSHA ID 2601705
    Abandoned 1984-07-10
96. FINLAY PORT. SCREEN

    Surface metal/non-metal · Western Rock Products Inc · MSHA ID 2602282
    Abandoned 2000-01-19
97. Friendship Mining

    Surface metal/non-metal · Vetex Inc · MSHA ID 2602028
    Abandoned 1988-05-23
98. Garnet Valley

    Surface metal/non-metal · Ames Construction Inc · MSHA ID 2602186
    Abandoned 1991-06-11
99. Genesis Mining

    Surface metal/non-metal · Genesis Mining · MSHA ID 2601998
    Abandoned 1987-07-17
100. Gibraltar Mines Ltd

     Surface metal/non-metal · Gibraltar Mines Ltd · MSHA ID 2602114
     Abandoned 1992-05-13
101. Gibson Road Pit & Mill

     Surface metal/non-metal · Wmk Transit Mix · MSHA ID 2600457
     Abandoned 1990-01-18
102. Ginger Lode No 1

     Surface metal/non-metal · Stanley Investment Inc · MSHA ID 2601607
     Abandoned 1981-05-18
103. Gold Recovery Limited

     Facility metal/non-metal · Gold Recovery Limited · MSHA ID 2601500
     Abandoned 1980-01-16
104. Golden Bell Mill

     Facility metal/non-metal · Dimension Mining & Milling Ltd · MSHA ID 2602067
     Abandoned 1989-08-14
105. Golden Bell Mine

     Surface metal/non-metal · Dimension Mining & Milling Ltd · MSHA ID 2602066
     Abandoned 2009-01-15
106. Golden Rod Mine

     Underground metal/non-metal · Golden Rod Mining Company · MSHA ID 2601924
     Abandoned 1986-06-11
107. Goldstrike Mine

     Surface metal/non-metal · Custom Crushing Inc · MSHA ID 2602073
     Abandoned 2003-10-24
108. Goodsprings Mine

     Surface metal/non-metal · United Rock Products · MSHA ID 2602665
     Abandoned 2010-08-24
109. GORNOWICH SAND & PROCESSING

     Surface metal/non-metal · Csr · MSHA ID 2602377
     Abandoned 2001-03-13
110. GRANT CLAIMS

     Surface metal/non-metal · Superior Sand & Gravel Company · MSHA ID 2602425
     Abandoned 2001-07-18
111. Gravel Pit

     Surface metal/non-metal · Mel Clark Construction · MSHA ID 2602185
     Abandoned 2002-10-29
112. Greenway Road

     Surface metal/non-metal · Progressive Contracting Inc · MSHA ID 2602177
     Abandoned 1991-04-08
113. Hardy Mine

     Surface metal/non-metal · Hardy Mining Company · MSHA ID 2601606
     Abandoned 1981-05-18
114. Harker Portable

     Surface metal/non-metal · Harker & Sons LLC · MSHA ID 2602579
     Abandoned 2006-07-28
115. Hawk #9

     Underground metal/non-metal · Inman-Goff & Mondragon · MSHA ID 2602094
     Abandoned 1989-06-15
116. Heavy Duty LLC

     Surface metal/non-metal · Heavy Duty LLC · MSHA ID 2602582
     Abandoned 2013-09-30
117. Henderson Pit

     Surface metal/non-metal · Nevada Rock & Sand Company · MSHA ID 2601003
     Abandoned 1986-03-06
118. HENDERSON PLANT

     Facility metal/non-metal · Chemical Lime Company Of Arizona · MSHA ID 2600082
     Abandoned 2003-08-14
119. HENDERSON QUARRY

     Surface metal/non-metal · Whiting Brothers Construction Company Inc · MSHA ID 2601151
     Abandoned 1997-05-02
120. High Desert Resources Incorporated

     Facility metal/non-metal · High Desert Resources Inc · MSHA ID 2601984
     Abandoned 1987-06-30
121. Holddiggers Pit

     Surface metal/non-metal · Holddiggers Trucking · MSHA ID 2601734
     Abandoned 1986-04-07
122. Holiday Mines

     Surface metal/non-metal · R L McVane Inc. · MSHA ID 2602480
     Abandoned 2003-02-19
123. Hyer Pit

     Surface metal/non-metal · Robison Equipment & Construction Company · MSHA ID 2601442
     Abandoned 1979-09-11
124. IMPACT 4146

     Surface metal/non-metal · Oasis Crushing & Screening Company Inc · MSHA ID 2602453
     Abandoned 2001-10-09
125. IMPACTOR #12

     Surface metal/non-metal · Oasis Crushing & Screening Company Inc · MSHA ID 2602448
     Abandoned 2002-12-19
126. IMPACTOR #2

     Surface metal/non-metal · Oasis Crushing & Screening Company Inc · MSHA ID 2602451
     Abandoned 2002-12-19
127. Ironstain

     Surface metal/non-metal · Bird Springs Materials · MSHA ID 2602188
     Abandoned 1995-03-20
128. Isom Sand & Gravel

     Surface metal/non-metal · Isom Sand & Gravel · MSHA ID 2602118
     Abandoned 1992-10-05
129. J R Jacks Portable Plant

     Surface metal/non-metal · J R Jacks Construction Company · MSHA ID 2602144
     Abandoned 1990-09-21
130. Jackpot Patsy Lode Claim GP (JP Project)

     Surface metal/non-metal · Krause Thacke Mining & Minerals LLC · MSHA ID 2602126
     Abandoned 2009-10-02
131. Janet'S Sand

     Surface metal/non-metal · Janet'S Sand Company · MSHA ID 2602070
     Abandoned 1990-06-05
132. Janko No 2

     Underground metal/non-metal · Hardy Property Maintenance · MSHA ID 2601993
     Abandoned 1988-04-26
133. JAW #1

     Surface metal/non-metal · Oasis Crushing & Screening Company Inc · MSHA ID 2602449
     Abandoned 2002-12-19
134. JAW #11

     Surface metal/non-metal · Oasis Crushing & Screening Company Inc · MSHA ID 2602450
     Abandoned 2002-12-19
135. Jaw Crusher 1

     Surface metal/non-metal · Landfill Resource Recovery Inc · MSHA ID 2602794
     Abandoned 2017-06-30
136. JEAN PIT

     Surface metal/non-metal · SOUTHWEST IRON WORKS, LLC · MSHA ID 2602569
     Abandoned 2009-10-19
137. JEAN SAND PIT

     Surface metal/non-metal · Pacific Western Aggregate Corp · MSHA ID 2602324
     Abandoned 1999-01-29
138. JEAN SAND PIT

     Surface metal/non-metal · Keck & Associates · MSHA ID 2602459
     Abandoned 2001-10-31
139. Jean Washplant

     Surface metal/non-metal · Performance Land Holdings LLC · MSHA ID 2602681
     Abandoned 2012-08-09
140. Jensen Construction Gravel Pit

     Surface metal/non-metal · Jensen Construction & Development Inc · MSHA ID 2601976
     Abandoned 1995-11-09
141. Jericho Heights

     Surface metal/non-metal · Southwest Iron Works LLC · MSHA ID 2602609
     Abandoned 2011-02-02
142. Jet Concrete

     Surface metal/non-metal · Jet Concrete Inc · MSHA ID 2602153
     Abandoned 1993-12-30
143. Jetco Mill

     Surface metal/non-metal · Jetco Enterprises Inc. · MSHA ID 2601757
     Abandoned 2008-09-02
144. Jinchang Global Industrial Trading LLC

     Surface metal/non-metal · Jinchang Global Industrial Trading LLC · MSHA ID 2602653
     Abandoned 2008-11-24
145. June Bug Mine

     Surface metal/non-metal · Hillcrest Companys · MSHA ID 2602791
     Abandoned 2016-06-01
146. K M I Material Pit

     Surface metal/non-metal · K M I Material Company · MSHA ID 2602130
     Abandoned 1992-01-28
147. La Mesa 1 Thru 4

     Surface metal/non-metal · Charlie Brown Construction · MSHA ID 2602152
     Abandoned 1990-05-17
148. Lake Las Vegas

     Surface metal/non-metal · Washington Construction · MSHA ID 2602125
     Abandoned 1993-04-09
149. Lake Mead Pit & Mill

     Surface metal/non-metal · Eagle Rock & Sand Inc · MSHA ID 2601625
     Abandoned 1982-09-20
150. Lakes Sand & Gravel

     Surface metal/non-metal · Lakes Sand & Gravel · MSHA ID 2602108
     Abandoned 1991-03-15

…and 203 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.

• Nye County 18,876
• Esmeralda County 17,520
• White Pine County 9,347
• Mineral County 8,599
• Humboldt County 8,385
• Elko County 7,657
• Lander County 6,751
• Pershing County 6,611
• Lyon County 6,309
• Churchill County 5,527
• Eureka County 4,664
• Washoe County 2,642

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.