Abandoned mines in Plumas County, California

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   251 39.2%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   128 20.0%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   131 20.4%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   113 17.6%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   16 2.5%
6. Mills, tipples and facilities

   processing plants and hazardous structures
   2 0.3%

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. 12 Mile Bar

   Surface metal/non-metal · Sharp'S & Son'S · MSHA ID 0404657
   Abandoned 1983-09-14
2. 1310 finley

   Surface metal/non-metal · Wilburn Construction Inc. · MSHA ID 0405880
   Abandoned 2014-07-09
3. CAGLE PIT

   Surface metal/non-metal · Feather River Rock Company · MSHA ID 0405325
   Abandoned 2008-10-17
4. Calgom Mining Incorporated

   Facility metal/non-metal · Calgom Mining Inc · MSHA ID 0404543
   Abandoned 1990-05-11
5. Caribou

   Surface metal/non-metal · High Sierra Mining Inc · MSHA ID 0404616
   Abandoned 1984-06-18
6. China Bar/Insurance #1

   Surface metal/non-metal · First California Financial & Development · MSHA ID 0404504
   Abandoned 1981-11-09
7. CRYSTAL PEAK

   Surface metal/non-metal · C B S Aggregates Llc · MSHA ID 0405464
   Abandoned and Sealed 2002-08-12
8. Doyle Crossing Pit

   Surface metal/non-metal · Miller'S Custom Work Inc · MSHA ID 0404214
   Abandoned 1978-08-22
9. Feather River Pit And Mill

   Surface metal/non-metal · Crushed Stone Aggregates · MSHA ID 0404227
   Abandoned 1978-07-31
10. FEATHER RIVER TRAVERTINE QUARRY

    Surface metal/non-metal · B & R Quarries · MSHA ID 0402321
    Abandoned 1998-12-08
11. Fred Scott Placer

    Underground metal/non-metal · Lucky Chance Mining Company Inc · MSHA ID 0404367
    Abandoned 1981-11-09
12. Goss Pit

    Surface metal/non-metal · Joy Engineering · MSHA ID 0405871
    Abandoned 2025-03-11
13. Grande Finale-Ken Millie

    Surface metal/non-metal · Augury Institute Llc · MSHA ID 0405258
    Abandoned 1996-09-13
14. Huntington Crusher

    Surface metal/non-metal · Plumas Rock Inc · MSHA ID 0404203
    Abandoned 1979-05-22
15. Indian Creek Mining

    Surface metal/non-metal · Indian Creek Mining Association · MSHA ID 0404542
    Abandoned 1984-09-04
16. Indian Valley Rock

    Surface metal/non-metal · Turner Excavating, Inc · MSHA ID 0405855
    Abandoned 2025-08-11
17. Larkin-Story Hazzard Mine

    Underground metal/non-metal · Indian-American Oil & Minerals Inc · MSHA ID 0404374
    Abandoned 1982-10-01
18. Lucky Chance Mine

    Underground metal/non-metal · Lucky Chance Mine · MSHA ID 0404375
    Abandoned 1982-10-01
19. Mc Mullen Sand & Gravel

    Surface metal/non-metal · Mc Mullen Sand & Gravel · MSHA ID 0403992
    Abandoned 1982-10-01
20. Mill Bar Pit

    Surface metal/non-metal · Riverside Rock II · MSHA ID 0405500
    Abandoned 2015-08-03
21. Morin & Morin Claims

    Surface metal/non-metal · Seneca Mining & Developing Company · MSHA ID 0404430
    Abandoned 1982-10-01
22. North Chester Pit

    Surface metal/non-metal · Sierra Cascade Aggregate & Asphalt Products, Inc. · MSHA ID 0404724
    Abandoned 2025-06-09
23. Pense Mine

    Underground metal/non-metal · Al Wasley · MSHA ID 0404822
    Abandoned 1987-08-04
24. Plumas Gold Mine

    Underground metal/non-metal · Plumas Gold Mines Usa Inc · MSHA ID 0404669
    Abandoned 1991-03-18
25. Portable Plant #1

    Surface metal/non-metal · Feather River Materials Inc · MSHA ID 0405489
    Abandoned 2019-10-01
26. Rich Bar Mine

    Surface metal/non-metal · Rich Bar Mining Company · MSHA ID 0404776
    Abandoned 1986-05-07
27. Rock-O Travertine Quarry

    Surface metal/non-metal · Rock-O · MSHA ID 0404125
    Abandoned 1981-04-07
28. Shoofly Mine

    Underground metal/non-metal · Harry Forcino · MSHA ID 0404204
    Abandoned 1979-08-23
29. SPANISH CREEK SAND & GRAVEL

    Surface metal/non-metal · Chatfield Ranch Llc · MSHA ID 0401667
    Abandoned 2005-09-30
30. Sunnyside Mine (Lee Marvin Drift)

    Underground metal/non-metal · Trans Waterways Usa Inc · MSHA ID 0404911
    Abandoned 1989-07-27
31. Sunnyside Placer

    Surface metal/non-metal · Avid Mining Company · MSHA ID 0404546
    Abandoned 1988-04-26
32. Surface Seneca Properties

    Surface metal/non-metal · Hilltop Mining Company Inc · MSHA ID 0404642
    Abandoned 1985-05-22
33. Telestack Belt TC-421R

    Surface metal/non-metal · Joy Engineering · MSHA ID 2602881
    Abandoned 2023-05-16
34. TREASURE CANYON LODE MINES

    Underground metal/non-metal · Treasure Canyon Enterprises Inc · MSHA ID 0405259
    Abandoned 2002-09-23
35. Twain Enterprises Incorporated

    Surface metal/non-metal · Twain Enterprises Inc · MSHA ID 0404969
    Abandoned 1989-06-07
36. Underground Seneca Properties

    Underground metal/non-metal · Hilltop Mining Company Inc · MSHA ID 0404373
    Abandoned 1986-04-15

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.