Abandoned mines in Nye County, Nevada

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   4,119 21.8%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   14,031 74.3%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   146 0.8%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   503 2.7%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   76 0.4%
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. A S C Excavating & Grading

   Surface metal/non-metal · A S C Excavating & Grading Inc · MSHA ID 2602557
   Abandoned 2009-03-23
2. A. BORASKY EXCAVATING

   Surface metal/non-metal · A Borasky Excavating · MSHA ID 2602361
   Abandoned 2007-05-11
3. Airport Pit

   Surface metal/non-metal · Tonopah Sand & Gravel Company · MSHA ID 2600488
   Abandoned 1981-06-02
4. AMERICAN WHOLESALE

   Surface metal/non-metal · American Wholesale · MSHA ID 2602253
   Abandoned 2001-07-30
5. Barcelona

   Underground metal/non-metal · Barcelona Mining Company · MSHA ID 2600597
   Abandoned 1982-05-03
6. Barite Mine

   Surface metal/non-metal · All Minerals Corp · MSHA ID 2600847
   Abandoned 1985-05-22
7. Bas Claims #1-10

   Surface metal/non-metal · Geo Drilling Fluids Inc · MSHA ID 2601762
   Abandoned 1982-05-11
8. Bas-Sunnyday

   Surface metal/non-metal · Common Port Minerals Inc · MSHA ID 2601579
   Abandoned 1982-05-03
9. Basic Inc-Nevada Works-Luning

   Facility metal/non-metal · Basic Inc · MSHA ID 2600899
   Abandoned 1986-05-01
10. Big Horn Antimony Mine

    Underground metal/non-metal · Silver State Antimony · MSHA ID 2601964
    Abandoned 1986-10-21
11. Black Rock Material Site

    Surface metal/non-metal · Nekekim Corporation · MSHA ID 2602563
    Abandoned 2006-09-11
12. Blm Pit -Hwy 60

    Surface metal/non-metal · Cemex · MSHA ID 2602221
    Abandoned 2008-06-30
13. Bobby #4 Mine And Mill

    Underground metal/non-metal · A & B Mining Company · MSHA ID 2601170
    Abandoned 1979-09-14
14. Bolling Pit

    Surface metal/non-metal · Bolling Construction Inc · MSHA ID 2601508
    Abandoned 1982-07-01
15. BOWMA ROCK PIT-2

    Surface metal/non-metal · Bowman Landscape Rock · MSHA ID 2602358
    Abandoned 1999-09-22
16. BOWMAN ROCK PIT 1

    Surface metal/non-metal · Bowman Landscape Rock · MSHA ID 2602269
    Abandoned 2001-08-09
17. BOWMANROCK PIT 3

    Surface metal/non-metal · Bowman Landscape Rock · MSHA ID 2602359
    Abandoned 1999-09-22
18. Bull Frog

    Surface metal/non-metal · Cruson & Pansze · MSHA ID 2601940
    Abandoned 1987-03-23
19. Bull Frog Mill

    Facility metal/non-metal · Fluor Daniel Inc · MSHA ID 2602078
    Abandoned 1989-09-05
20. Bullfrog

    Surface metal/non-metal · White Mineral Resources Inc · MSHA ID 2601691
    Abandoned 1982-11-15
21. BULLFROG MINE

    Surface metal/non-metal · Industrial Constructors Corp · MSHA ID 2602074
    Abandoned 1998-12-18
22. BULLFROG MINE & MILL

    Surface metal/non-metal · Barrick Bullfrog Inc · MSHA ID 2602077
    Abandoned 2001-08-06
23. BULLFROG MINE-UNDERGROUND

    Underground metal/non-metal · Barrick Bullfrog Inc · MSHA ID 2602184
    Abandoned 1999-05-17
24. Calvada Pit And Mill

    Surface metal/non-metal · Wulfenstein Construction Company Inc · MSHA ID 2601066
    Abandoned 1978-12-12
25. Canica Impact Crusher S/N 105-150-96

    Surface metal/non-metal · H E Hunewill Construction Company Inc · MSHA ID 2602462
    Abandoned 2017-01-05
26. Cloverdale Mine

    Surface metal/non-metal · Action Enterprises Nevada, LLC. · MSHA ID 2602761
    Abandoned 2014-10-01
27. Columbus Project

    Surface metal/non-metal · Columbus SM LLC · MSHA ID 2601674
    Abandoned 2019-10-21
28. Contact Mine

    Underground metal/non-metal · Park Canyon Mining & Development Co Inc · MSHA ID 2601782
    Abandoned 1982-09-02
29. Corona Gold Project (Santa Fe Mines)

    Surface metal/non-metal · Brown & Root Inc · MSHA ID 2602224
    Abandoned 1994-07-22
30. Crescent Silver Peak Mine

    Underground metal/non-metal · MLTLC LLC · MSHA ID 2602676
    Abandoned 2010-07-15
31. CRESCENT SILVER PEAK MINE

    Underground metal/non-metal · LAQUIM MINING CONTRACTORS LLC · MSHA ID 2602682
    Abandoned 2010-03-23
32. Crowell Fluorspar Mine

    Underground metal/non-metal · J Irving Crowell & Son · MSHA ID 2600091
    Abandoned 1990-11-13
33. Crusher #1

    Surface metal/non-metal · American Silica Inc · MSHA ID 2602430
    Abandoned 2008-03-17
34. Currant Creek Project #1745

    Surface metal/non-metal · G P Construction Company Inc · MSHA ID 2601540
    Abandoned 1979-10-23
35. Currie

    Underground metal/non-metal · Richfield Resources Inc · MSHA ID 2601591
    Abandoned 1980-10-10
36. Custom Rock LLC

    Surface metal/non-metal · Custom Rock LLC · MSHA ID 2602568
    Abandoned 2009-08-21
37. D&H MINING RANCH PIT

    Surface metal/non-metal · D & H Mining Ltd Partnership · MSHA ID 2602205
    Abandoned 2009-03-23
38. DAISY GOLD MINE

    Surface metal/non-metal · Glamis Gold Inc · MSHA ID 2602301
    Abandoned 2001-08-01
39. Daisy Lane Claims

    Surface metal/non-metal · R & J Mining Inc · MSHA ID 2601798
    Abandoned 1982-09-10
40. DBE PIT

    Surface metal/non-metal · Deandrea Business Enterprises · MSHA ID 2602433
    Abandoned 2000-12-01
41. Desert Sand Portable

    Surface metal/non-metal · Desert Sand & Gravel Inc · MSHA ID 2602456
    Abandoned 2005-01-31
42. Duckwater Pit

    Surface metal/non-metal · Stewart Construction Company · MSHA ID 2601490
    Abandoned 1980-11-26
43. E S F Project

    Underground metal/non-metal · U S Department Of Energy · MSHA ID 2602063
    Abandoned 1989-09-19
44. East Belmont Project

    Surface metal/non-metal · Dorado Mining Company Inc · MSHA ID 2601888
    Abandoned 1984-09-07
45. East Manhattan Mine

    Underground metal/non-metal · Toquima Gold · MSHA ID 2602813
    Abandoned 2020-10-24
46. Echo Bay Tonopah Assay Lab

    Facility metal/non-metal · Echo Bay Minerals Company · MSHA ID 2600420
    Abandoned 1988-11-01
47. Elite Concrete Sand & Gravel

    Surface metal/non-metal · Elite Concrete Sand & Gravel · MSHA ID 2602343
    Abandoned 2001-09-06
48. EQUATORIAL TONOPAH

    Surface metal/non-metal · Equatorial Tonopah Inc · MSHA ID 2602364
    Abandoned 2003-09-10
49. Erlandson Transportation, Inc.

    Surface metal/non-metal · Erlandson Transportation, Inc. · MSHA ID 1302265
    Abandoned 2014-02-01
50. Forest Home Pit

    Surface metal/non-metal · Nye County Road Department · MSHA ID 2602446
    Abandoned 2015-12-16
51. Gila Mine

    Surface metal/non-metal · Gila Mines Corp · MSHA ID 2601659
    Abandoned 1983-04-13
52. Gold Bar Mine

    Surface metal/non-metal · Angst Inc · MSHA ID 2602010
    Abandoned 1992-10-16
53. Gold Canyon Portable #1

    Surface metal/non-metal · Gold Canyon Mining & Construction LLC · MSHA ID 0203222
    Abandoned 2012-11-01
54. GOLD DUST

    Underground metal/non-metal · Ione Gold Mining Company Inc · MSHA ID 2602378
    Abandoned 1999-04-24
55. Gold Hill Mine

    Surface metal/non-metal · Argus Resources Inc · MSHA ID 2601677
    Abandoned 1982-05-03
56. Golden Arrow

    Surface metal/non-metal · Golden Arrow Mining Company · MSHA ID 2601541
    Abandoned 1982-05-03
57. Grantsville Mine

    Surface metal/non-metal · Fury Explorations Nevada Inc · MSHA ID 2602017
    Abandoned 1990-04-23
58. Green Ash 2

    Surface metal/non-metal · Rook & Messer Excavating Company · MSHA ID 2601585
    Abandoned 1981-06-15
59. Green Rock Resources

    Surface metal/non-metal · Concrete Systems Inc · MSHA ID 2602210
    Abandoned 1993-09-13
60. H W W T

    Surface metal/non-metal · Have Welder Will Travel · MSHA ID 2602424
    Abandoned 2026-07-23
61. Harris Fence and Concrete Co Inc

    Surface metal/non-metal · Harris Fence and Concrete Co Inc · MSHA ID 2602648
    Abandoned 2016-10-03
62. Ibex Mine

    Surface metal/non-metal · Silver Viking Inc · MSHA ID 2601458
    Abandoned 1979-12-04
63. Indian Springs Mine

    Surface metal/non-metal · J & B Mining Company · MSHA ID 2601446
    Abandoned 1978-03-01
64. Ione

    Surface metal/non-metal · Argus Resources Inc · MSHA ID 2601676
    Abandoned 1983-06-30
65. IONE MINE (AKA NEVADA MERCURY)

    Underground metal/non-metal · Ione Gold Llc · MSHA ID 2602393
    Abandoned 2000-04-06
66. Ione Mines

    Underground metal/non-metal · Marshall Earth Resources Inc · MSHA ID 2601890
    Abandoned 1993-04-01
67. Ione Placer

    Surface metal/non-metal · Marshall Earth Resources Inc · MSHA ID 2601786
    Abandoned 1984-11-23
68. Jarraro

    Surface metal/non-metal · John Martin Owner · MSHA ID 2600762
    Abandoned 1978-05-09
69. Jig Plant

    Facility metal/non-metal · All Minerals Corp · MSHA ID 2601124
    Abandoned 1985-05-22
70. Jonny Mine Joint Venture

    Surface metal/non-metal · Agromin Inc & Ala Supp Inc · MSHA ID 2601697
    Abandoned 1981-08-31
71. Jumbo Mine

    Surface metal/non-metal · Geo Drilling Fluids Inc · MSHA ID 2601810
    Abandoned 1982-08-02
72. Kandace Mine

    Surface metal/non-metal · Can Do Excavating Inc · MSHA ID 2602792
    Abandoned 2019-11-01
73. Keystone Project

    Surface metal/non-metal · Ibex Mining Corp · MSHA ID 2601547
    Abandoned 1979-12-04
74. Keystone-Manhattan

    Surface metal/non-metal · Nevada Goldfields Inc · MSHA ID 2602134
    Abandoned 1991-08-21
75. Lathrop Mill

    Facility metal/non-metal · American Borate Company · MSHA ID 2600639
    Abandoned 2006-04-27
76. Liberty Moly Project

    Surface metal/non-metal · General Moly Inc · MSHA ID 2602069
    Abandoned 2008-09-05
77. Manhattan Mill

    Surface metal/non-metal · Manhattan Milling Inc · MSHA ID 2601544
    Abandoned 1982-05-03
78. MANHATTAN MILL SITE

    Facility metal/non-metal · Western Mine Development · MSHA ID 2602305
    Abandoned 2001-07-30
79. Manhattan Mine

    Surface metal/non-metal · W E Vining Company Inc · MSHA ID 2600974
    Abandoned 1990-12-21
80. Manhattan Mine & Mill

    Facility metal/non-metal · Round Mountain Gold Corp · MSHA ID 2601566
    Abandoned 1994-11-16
81. Manhattan Project

    Surface metal/non-metal · Dixie Exploration Corp · MSHA ID 2602024
    Abandoned 1988-02-16
82. Manhattan West Limited

    Surface metal/non-metal · Manhattan West Limited · MSHA ID 2602203
    Abandoned 1995-08-14
83. Manhatten Gulch

    Facility metal/non-metal · Pavement Plaining Company Inc · MSHA ID 2601562
    Abandoned 1982-05-03
84. MANHATTEN MINE

    Underground metal/non-metal · Harrison Western Construction Corp · MSHA ID 2602293
    Abandoned 1998-03-16
85. Mayberry Mine

    Underground metal/non-metal · Lindahl Mining Company · MSHA ID 2601707
    Abandoned 1982-09-08
86. Mayflower Mine

    Underground metal/non-metal · Nevada Minerals Company Inc · MSHA ID 2601732
    Abandoned 1982-09-07
87. Meadow Valley Mine

    Facility metal/non-metal · Moapa Valley Mining Ltd · MSHA ID 2601823
    Abandoned 1984-07-10
88. Mercury Mountain Project

    Surface metal/non-metal · Volcanic Gold & Silver LLC · MSHA ID 2602798
    Abandoned 2019-01-09
89. MESQUITE AND & GRAVEL

    Surface metal/non-metal · Mesquite Sand & Gravel · MSHA ID 2602357
    Abandoned 2002-03-15
90. MINE SITE 1

    Surface metal/non-metal · M S V R Equipment Rentals Ltd · MSHA ID 2602419
    Abandoned 2001-03-05
91. Minerals Company

    Surface metal/non-metal · Minerals Company · MSHA ID 2601623
    Abandoned 1981-03-27
92. Montgomery-Shoshone

    Facility metal/non-metal · Bullfrog Enterprises · MSHA ID 2601663
    Abandoned 1986-12-17
93. Mother Lode Mine

    Surface metal/non-metal · U S Nevada Gold Search · MSHA ID 2602110
    Abandoned 1992-10-16
94. Nellie Gray Mine

    Underground metal/non-metal · James B Pauley · MSHA ID 2601136
    Abandoned 1982-05-11
95. Nevada Molly Project

    Surface metal/non-metal · Anaconda Minerals Company · MSHA ID 2601483
    Abandoned 1986-03-10
96. NEVADA NEANDERTHAL STONE

    Surface metal/non-metal · Nevada Neanderthal Stone · MSHA ID 2602206
    Abandoned 2000-04-12
97. New Discovery Mine

    Underground metal/non-metal · VM Buyer LLC · MSHA ID 2600052
    Abandoned 2017-03-31
98. New Johnnie Mine

    Underground metal/non-metal · Buck Mining Company · MSHA ID 2602770
    Abandoned 2025-03-31
99. Northridge No 1 And Millsite

    Underground metal/non-metal · Southwest Mining & Milling Company · MSHA ID 2601421
    Abandoned 1980-01-03
100. Northumberland

     Surface metal/non-metal · Western States Minerals Corp · MSHA ID 2601661
     Abandoned 1995-09-28
101. Nye County Plant

     Surface metal/non-metal · West Coast Aggregate · MSHA ID 2602788
     Abandoned 2016-06-01
102. NYE COUNTY SAND & GRAVEL PORTABL

     Surface metal/non-metal · Nye County Road Department · MSHA ID 2601971
     Abandoned 2001-10-01
103. Oasis Mine

     Surface metal/non-metal · Auries Mining Development Company · MSHA ID 2601781
     Abandoned 1982-06-24
104. Old Soldier Mine

     Surface metal/non-metal · Standard Magnesia Company · MSHA ID 2600823
     Abandoned 1991-08-23
105. Old Sullivan Mine

     Surface metal/non-metal · Arizona Hillside Mining Company · MSHA ID 2601852
     Abandoned 1985-03-15
106. PAHRUMP

     Surface metal/non-metal · Basin Sand & Gravel · MSHA ID 2602455
     Abandoned 2004-08-06
107. Pahrump Valley Gravel

     Surface metal/non-metal · Pahrump Valley Gravel · MSHA ID 2602181
     Abandoned 2022-10-17
108. PAHRUMP VALLEY GRAVEL, PORTABLE#

     Surface metal/non-metal · Pahrump Valley Gravel · MSHA ID 2602444
     Abandoned 2003-09-17
109. PARADISE PEAK MINE

     Surface metal/non-metal · Arimetco Paradise Peak Corp · MSHA ID 2601908
     Abandoned 2000-06-02
110. Park Canyon Mine

     Underground metal/non-metal · Golden Reed Mining & Development Company · MSHA ID 2601720
     Abandoned 1982-02-01
111. PASCO GRAVEL CO.

     Surface metal/non-metal · Pasco Gravel Company · MSHA ID 2602418
     Abandoned 2002-08-19
112. PAUL MOORE'S SAND & GRAVEL INC

     Surface metal/non-metal · Paul Moore'S Sand & Gravel Inc · MSHA ID 2602248
     Abandoned 2005-06-01
113. Paymaster

     Underground metal/non-metal · Jesse R Wilson · MSHA ID 2601493
     Abandoned 1985-10-16
114. Pilot Mountain

     Underground metal/non-metal · Umetco Minerals Corp · MSHA ID 2601513
     Abandoned 1985-10-28
115. Pioneer

     Surface metal/non-metal · Seven Cities Mining & Development Inc · MSHA ID 2601744
     Abandoned 1982-10-01
116. Portable 1

     Surface metal/non-metal · Awesome Construction, LLC · MSHA ID 2602555
     Abandoned 2006-09-16
117. PORTABLE SCREEN #1

     Surface metal/non-metal · Max Riggs Construction Company Inc · MSHA ID 2602272
     Abandoned 1996-11-18
118. Premier Services Corporation-Mine

     Surface metal/non-metal · Premier Services Corp · MSHA ID 2600864
     Abandoned 1993-04-01
119. R M G C Deep Exploration

     Underground metal/non-metal · Centennial Development Company · MSHA ID 2601951
     Abandoned 1989-08-07
120. Raspberry Mine

     Surface metal/non-metal · Piper & Associates · MSHA ID 2601892
     Abandoned 1985-06-26
121. RED RIDGE SAND & GRAVEL

     Surface metal/non-metal · Red Ridge Sand & Gravel · MSHA ID 2602327
     Abandoned 1999-08-24
122. Reveille Project

     Surface metal/non-metal · Reveille Exploration Inc · MSHA ID 2601457
     Abandoned 1982-05-03
123. Rmgc Smoky Valley Common Oper Explor Dec

     Underground metal/non-metal · J S Redpath Corp · MSHA ID 2602119
     Abandoned 1990-09-25
124. Rock Valley Community Pit

     Surface metal/non-metal · Nyecon · MSHA ID 2602680
     Abandoned 2016-01-19
125. ROCK VALLEY WASH

     Surface metal/non-metal · Pahrump Concrete Inc · MSHA ID 2602335
     Abandoned 2001-03-06
126. Roundmountain Pit

     Surface metal/non-metal · Concrete Products Co-Div/Gibbons & Reed Company · MSHA ID 2602058
     Abandoned 1988-08-08
127. Shale Pit And Mill

     Surface metal/non-metal · Permeator Corp · MSHA ID 2601349
     Abandoned 1978-05-09
128. Shamrock Tunnel #2

     Underground metal/non-metal · Marshall Earth Resources Inc · MSHA ID 2601825
     Abandoned 1984-11-23
129. Sidewinder

     Surface metal/non-metal · D & K Exploration · MSHA ID 2601692
     Abandoned 1982-10-04
130. Simkins Pit

     Surface metal/non-metal · Bolling Construction Inc · MSHA ID 2601988
     Abandoned 2009-09-28
131. Sky Claims

     Surface metal/non-metal · Marshall Earth Resources Inc · MSHA ID 2601613
     Abandoned 1986-02-25
132. South Reveille

     Surface metal/non-metal · South Reveille Mining Inc · MSHA ID 2601658
     Abandoned 1982-05-03
133. State Highway District No 5

     Surface metal/non-metal · Nevada State Highway Department · MSHA ID 2600776
     Abandoned 1982-05-21
134. Sterling Mine

     Underground metal/non-metal · Saga Exploration Company · MSHA ID 2601236
     Abandoned 1979-09-11
135. Sterling Pit

     Surface metal/non-metal · Saga Exploration Company · MSHA ID 2602105
     Abandoned 1990-02-23
136. Stewart Kelly Mill

     Facility metal/non-metal · Stewart Kelly Mine (Mdi) · MSHA ID 2601699
     Abandoned 1981-09-15
137. Stewart Kelly Mine

     Surface metal/non-metal · Stewart Kelly Mine (Mdi) · MSHA ID 2601698
     Abandoned 1981-09-15
138. Stokes Iron Mine

     Surface metal/non-metal · Standard Slag Company · MSHA ID 2601531
     Abandoned 1980-06-05
139. Sullivan Mine

     Surface metal/non-metal · Glamis Gold Inc · MSHA ID 2602005
     Abandoned 1988-11-17
140. Summit Mine

     Surface metal/non-metal · Republic Resources Inc · MSHA ID 2601745
     Abandoned 1982-09-08
141. Summit Project

     Surface metal/non-metal · Zephyr Resources Inc · MSHA ID 2602131
     Abandoned 1990-04-10
142. Terex Cobra Impact Crusher

     Surface metal/non-metal · Canyon Construction Co · MSHA ID 2602640
     Abandoned 2023-11-10
143. Thanksgiving Mine

     Surface metal/non-metal · International Bullion Llc · MSHA ID 2602247
     Abandoned 1994-08-19
144. Three Metals

     Underground metal/non-metal · Richfield Resources Inc · MSHA ID 2601589
     Abandoned 1981-09-15
145. Tonopah Airport Facility

     Surface metal/non-metal · Solauro Industries Inc · MSHA ID 2602718
     Abandoned 2016-05-24
146. Tonopah Extension

     Underground metal/non-metal · Geowest Services Inc · MSHA ID 2601604
     Abandoned 1982-05-03
147. Tonopah Extension

     Surface metal/non-metal · Nevada Western Industries Inc · MSHA ID 2601961
     Abandoned 1987-02-20
148. Tonopah Roving Plant

     Surface metal/non-metal · Nevada Department Of Transportation · MSHA ID 2601970
     Abandoned 1994-02-07
149. Tonopah Sand & Granvel Inc

     Surface metal/non-metal · Tonopah Sand & Gravel · MSHA ID 2601943
     Abandoned 2013-10-01
150. Tonopah Sand & Gravel #2

     Surface metal/non-metal · Ketten Enterprises Inc · MSHA ID 2601966
     Abandoned 1991-01-04

…and 13 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.

• 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
• Clark County 5,392
• 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.