Abandoned mines in Amador County, California

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   165 42.3%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   90 23.1%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   16 4.1%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   81 20.8%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   38 9.7%

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.

Problem types carry OSMRE's priority prefix: P1 and P2 are threats to health, safety and property, P3 is environmental. A problem area is a cluster of problems reclaimed as one project; several rows can share one location.

1. Berry Pit

   Surface metal/non-metal · H C Muddox · MSHA ID 0405106
   Abandoned 1991-07-19
2. Blackstone Mine

   Underground metal/non-metal · U S Gold Mines Inc · MSHA ID 0404488
   Abandoned 1988-02-23
3. CALCINE 1-3 MILL

   Facility metal/non-metal · North American Refractories Company · MSHA ID 0402866
   Abandoned 2002-08-12
4. Ex Cramer Gold Mine

   Underground metal/non-metal · Paul Ramm · MSHA ID 0403044
   Abandoned 1980-07-25
5. Fort Ann

   Underground metal/non-metal · Anderson & Associates · MSHA ID 0404578
   Abandoned 1982-08-09
6. Goose Hill Rock

   Surface metal/non-metal · Goose Hill Rock · MSHA ID 0405267
   Abandoned 2025-03-13
7. Grand Prize

   Underground metal/non-metal · Grand Prize Mining Ltd · MSHA ID 0404481
   Abandoned 1982-06-17
8. Green Decorative Rock

   Surface metal/non-metal · Elden & Sandra Wait · MSHA ID 0404256
   Abandoned 1982-08-10
9. Harry J Portal

   Underground metal/non-metal · Hageman Mining · MSHA ID 0405053
   Abandoned 1993-07-21
10. High Country Aggregates

    Surface metal/non-metal · High Country Partners LLC · MSHA ID 0405719
    Abandoned 2013-12-02
11. Howard Properties Lot 232

    Surface metal/non-metal · Ione Energy Inc · MSHA ID 0404993
    Abandoned 1991-01-02
12. Howard Properties Lot 232

    Surface coal · Jackson Valley Energy Partners L P · MSHA ID 0405126
    Abandoned 1996-04-15
13. Indian Hill Mill

    Facility metal/non-metal · Interpace Corp · MSHA ID 0402868
    Abandoned 1982-05-21
14. Ione Area Mines

    Surface metal/non-metal · North American Refractories Company Inc · MSHA ID 0400564
    Abandoned 1982-08-09
15. Ione Minerals

    Surface metal/non-metal · US Mine Corporation · MSHA ID 0405532
    Abandoned 2017-06-30
16. Ione Plant

    Surface metal/non-metal · Zenith Clay Products Company · MSHA ID 0404166
    Abandoned 1982-05-21
17. Ione Plant

    Surface metal/non-metal · F T G Construction Materials Inc · MSHA ID 0405299
    Abandoned 2003-01-15
18. Ione Plant

    Surface metal/non-metal · Twin Pines Minerals LLC · MSHA ID 0405952
    Abandoned 2024-04-01
19. IONE PLANT

    Surface metal/non-metal · Hanson Aggregates West Inc · MSHA ID 0405036
    Abandoned 2001-03-12
20. Ione Red Clay Pit

    Surface metal/non-metal · Gladding Mc Bean · MSHA ID 0401174
    Abandoned 1979-08-01
21. Ione Rock

    Surface metal/non-metal · Ione Rock LP · MSHA ID 0404973
    Abandoned 2007-09-10
22. Irish Hill

    Surface metal/non-metal · Kent Raverty · MSHA ID 0405940
    Abandoned 2020-05-15
23. Irish Hill Aggregate

    Surface metal/non-metal · Kreth Inc · MSHA ID 0404141
    Abandoned 2005-09-30
24. Irish Hill Portable Plant No. 1

    Surface metal/non-metal · Newman Minerals, LLC · MSHA ID 0405660
    Abandoned 2019-03-15
25. ISP Granule Products Inc.

    Surface metal/non-metal · ISP Granule Products Inc. · MSHA ID 0405356
    Abandoned 2002-04-29
26. Jackson Valley Open Pit Mine

    Surface coal · Jackson Valley Energy Partners L P · MSHA ID 0405157
    Abandoned 1999-08-01
27. JACMAR PORTABLE

    Surface metal/non-metal · Jacmar Communications Construction Inc · MSHA ID 0405208
    Abandoned 1997-07-16
28. Lot 232 Pit

    Surface metal/non-metal · Interpace Corp · MSHA ID 0403892
    Abandoned 1979-10-10
29. Mc Guire Pit

    Surface metal/non-metal · Interpace Corp · MSHA ID 0400565
    Abandoned 1979-10-10
30. Mgm

    Underground metal/non-metal · Mgm Mining Inc · MSHA ID 0404881
    Abandoned 1993-11-10
31. Newman Minerals No.1

    Surface metal/non-metal · Newman Minerals LLC · MSHA ID 0405845
    Abandoned 2016-10-20
32. Pioneer Lucky Strike Mining Company LLC

    Underground metal/non-metal · Pioneer Lucky Strike Mining Company LLC · MSHA ID 0405862
    Abandoned 2015-06-30
33. Portable Plant #1

    Surface metal/non-metal · Eland Construction, Inc. · MSHA ID 0405617
    Abandoned 2007-04-04
34. Preparation Plant

    Facility metal/non-metal · American Lignite Products Company · MSHA ID 0400659
    Abandoned 1991-01-02
35. Preparation Plant

    Facility coal · Jackson Valley Energy Partners L P · MSHA ID 0405125
    Abandoned 1999-07-28
36. Upper Dry Creek Slate Mine

    Surface metal/non-metal · Horseshoe A Mining Company · MSHA ID 0405410
    Abandoned 2025-03-13
37. Volcano Quarry

    Surface metal/non-metal · Oi Ione Sts Inc · MSHA ID 0401610
    Abandoned 1994-06-20
38. Wagon Wheel Mine

    Underground metal/non-metal · H W & L E Jones · MSHA ID 0402412
    Abandoned 1978-04-01

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
• Riverside County 3,227
• 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

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.