Abandoned mines in Calaveras County, California

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   416 49.5%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   252 30.0%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   62 7.4%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   38 4.5%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   72 8.6%

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. 7/11 Materials Inc-Robie Ranch

   Surface metal/non-metal · 7/11 Materials Inc · MSHA ID 0404243
   Abandoned 2015-05-20
2. All Rock

   Surface metal/non-metal · All Rock · MSHA ID 0405172
   Abandoned 2019-02-08
3. Blackstone Mine

   Underground metal/non-metal · Richard Chilson Owner · MSHA ID 0404064
   Abandoned 1978-02-02
4. Blazing Star Mill

   Facility metal/non-metal · Gold Rock Industries Ltd · MSHA ID 0404242
   Abandoned 1987-10-29
5. Buena Vista Mine

   Underground metal/non-metal · Robert A Dubois · MSHA ID 0404572
   Abandoned 1982-08-09
6. Calaveras Asbestos Ltd (Pit)

   Surface metal/non-metal · Calaveras Natural Resources Inc · MSHA ID 0402547
   Abandoned 1985-06-14
7. Calaveras Asbestos Ltd Mine & Mill

   Facility metal/non-metal · Calaveras Asbestos Ltd · MSHA ID 0401061
   Abandoned 1988-04-07
8. Calaveras Rock

   Surface metal/non-metal · Harold O Parsons · MSHA ID 0404525
   Abandoned 1982-08-09
9. Camp Connell Rock Quarry

   Surface metal/non-metal · Claude C Wood Company · MSHA ID 0404401
   Abandoned 1982-07-30
10. Campo Seco Pit

    Surface metal/non-metal · Flintkote Company · MSHA ID 0400943
    Abandoned 1978-03-17
11. Carson Hill Rock Products

    Surface metal/non-metal · Carson Hill Rock Products · MSHA ID 0404792
    Abandoned 2021-08-18
12. Cataract Quarry

    Facility metal/non-metal · Genstar Cement Company · MSHA ID 0400432
    Abandoned 1983-08-01
13. Chili Gulch Rock

    Surface metal/non-metal · Kellog Creek Aggregates Inc · MSHA ID 0404909
    Abandoned 2025-06-30
14. COPPER ROCK SAN ANDREAS PIT

    Surface metal/non-metal · Copper Rock Jv · MSHA ID 0405361
    Abandoned 2000-09-15
15. E.I.G. MINE

    Surface metal/non-metal · Hi-Tech Environmental Products Llc · MSHA ID 0402864
    Abandoned 2001-08-18
16. Flume House Mine

    Underground metal/non-metal · O'Hara Resources Ltd · MSHA ID 0404466
    Abandoned 1989-12-11
17. Foothills Pit

    Surface metal/non-metal · Flintkote Company · MSHA ID 0400696
    Abandoned 1978-03-17
18. Fricot Mine

    Underground metal/non-metal · Charles Valente · MSHA ID 0403907
    Abandoned 1978-11-30
19. Grand Prize Mine

    Underground metal/non-metal · Grand Prize Mine · MSHA ID 0404611
    Abandoned 1983-08-11
20. Jackson Valley Open Pit Lignite Mining

    Surface metal/non-metal · Ione Energy Inc · MSHA ID 0404893
    Abandoned 1990-10-31
21. JOHN W. HERTZIG

    Surface metal/non-metal · John W Hertzig · MSHA ID 0401961
    Abandoned 2009-04-27
22. Lloyd Mine

    Underground metal/non-metal · Malkuriam Natural Resources Inc · MSHA ID 0404573
    Abandoned 1982-08-09
23. Lloyd Mine

    Underground metal/non-metal · High Sierras Resource Management Inc · MSHA ID 0404613
    Abandoned 1983-08-10
24. MCCARTY PIT

    Surface metal/non-metal · Foothill Materials, Inc. · MSHA ID 0405200
    Abandoned 2025-03-11
25. Miller Mine

    Underground metal/non-metal · Miller Mining Company Inc · MSHA ID 0404295
    Abandoned 1982-09-23
26. Mina Rica

    Underground metal/non-metal · Troy Gold Industries Ltd · MSHA ID 0404320
    Abandoned 1981-06-17
27. Mokelumne Hill Pit And Mill

    Surface metal/non-metal · George Reed Inc · MSHA ID 0402084
    Abandoned 1978-10-04
28. REDHILL MINE

    Surface metal/non-metal · Western Source · MSHA ID 0404395
    Abandoned 1998-01-15
29. Reed Lava Rock Quarry

    Surface metal/non-metal · George Reed Inc · MSHA ID 0403369
    Abandoned 1978-03-21
30. Robison Acosta & Blanton Port. Rock Crus

    Surface metal/non-metal · Robison Acosta Blanton Portable Rock Crushing · MSHA ID 0405231
    Abandoned 2003-07-21
31. ROYAL MOUNTAIN KING

    Surface metal/non-metal · Meridian Gold Company · MSHA ID 0404925
    Abandoned 1996-12-01
32. San Andreas Aggregates

    Surface metal/non-metal · Martin Marietta Northern California Aggregates,LLC · MSHA ID 0400539
    Abandoned 2024-12-31
33. San Andreas Cement Plant

    Facility metal/non-metal · Calaveras Cement Company · MSHA ID 0402272
    Abandoned 1987-10-15
34. Sonora Green Quarry

    Surface metal/non-metal · Bedford Aggregates · MSHA ID 0402349
    Abandoned 1980-06-17
35. Sonora Yellow Quarry

    Surface metal/non-metal · Sonora Aggregates Corp · MSHA ID 0402348
    Abandoned 1978-03-17
36. Spence Ranch Mill

    Surface metal/non-metal · William Spence · MSHA ID 0403994
    Abandoned 1978-02-03
37. TOYON MILL

    Facility metal/non-metal · Western Source · MSHA ID 0404490
    Abandoned 1998-01-15
38. Union Mine

    Underground metal/non-metal · Joseph Folsom · MSHA ID 0403719
    Abandoned 1978-11-30
39. Woodhouse Mine

    Underground metal/non-metal · Troy Gold Industries Ltd · MSHA ID 0404523
    Abandoned 1982-08-05
40. Yellow Aster

    Underground metal/non-metal · Yellow Aster Mining Company · MSHA ID 0404722
    Abandoned 1989-08-07

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
• 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.