Abandoned mines in Placer County, California

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   341 52.6%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   35 5.4%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   147 22.7%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   41 6.3%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   84 13.0%

…and 1 more named features not listed here.

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. American Bar Quartz

   Surface metal/non-metal · Till-Mcanally · MSHA ID 0404448
   Abandoned 1982-05-27
2. American Hill Mine

   Surface metal/non-metal · American Hill Mine Ltd · MSHA ID 0404447
   Abandoned 1982-07-21
3. ASPHALT/CONCRETE RECYCLING

   Facility metal/non-metal · Asphalt/Concrete Recycling · MSHA ID 0405359
   Abandoned 2000-07-07
4. BIG GUN MINING

   Surface metal/non-metal · Big Gun Mining · MSHA ID 0400297
   Abandoned 2001-04-12
5. C M D

   Underground metal/non-metal · Herman Axel · MSHA ID 0404808
   Abandoned 1988-12-08
6. Cmd Mine

   Underground metal/non-metal · Cmd Association · MSHA ID 0405232
   Abandoned 1994-06-22
7. Colfax Mine

   Surface metal/non-metal · Sterlling P Holloway Iii · MSHA ID 0403452
   Abandoned 1982-05-21
8. Colfax Quarry

   Surface metal/non-metal · American Olean Tile Company Inc · MSHA ID 0403716
   Abandoned 1982-08-09
9. Collet-Rocklin Aggregates

   Surface metal/non-metal · R C Collet Inc · MSHA ID 0404503
   Abandoned 1995-12-31
10. DANDY QUARTZ MINE

    Underground metal/non-metal · Richard Slechta Jr · MSHA ID 0405375
    Abandoned 2000-09-26
11. Digmore Placer

    Underground metal/non-metal · C D Livingston · MSHA ID 0404700
    Abandoned 1985-04-11
12. Donna'S Stake

    Underground metal/non-metal · Steve Dwane Craig · MSHA ID 0404479
    Abandoned 1982-08-09
13. East Branch Mine

    Underground metal/non-metal · American Jade & Gold Company · MSHA ID 0404446
    Abandoned 1987-01-20
14. El Dorado

    Surface metal/non-metal · East-West Mining & Milling Inc · MSHA ID 0404428
    Abandoned 1982-08-11
15. EL DORADO MINE LAST CHANCE

    Underground metal/non-metal · Robert J Morey · MSHA ID 0405378
    Abandoned 2000-06-08
16. Gleason Diggings

    Surface metal/non-metal · Boyle Exploration & Development · MSHA ID 0404666
    Abandoned 1985-03-15
17. GMcB Clay Products

    Surface metal/non-metal · Gladding McBean · MSHA ID 0400556
    Abandoned 2014-01-31
18. GOLD BUG MINE CAMC266545

    Underground metal/non-metal · Gordon H Gibbons · MSHA ID 0405393
    Abandoned 2000-09-18
19. GOLD KING MINE

    Underground metal/non-metal · Spanish Flat Mining Company Inc · MSHA ID 0405287
    Abandoned 1998-12-04
20. Gold Run Mine

    Underground metal/non-metal · Gates & Fox Company Inc · MSHA ID 0404438
    Abandoned 1981-03-12
21. Hazard

    Underground metal/non-metal · Point West Properties · MSHA ID 0402441
    Abandoned 1992-06-08
22. Hope & Wildcat

    Underground metal/non-metal · Richard R Sykora · MSHA ID 0404656
    Abandoned 1985-05-28
23. Indian Creek Phase A

    Surface metal/non-metal · Seneca Gold Mining Company · MSHA ID 0404463
    Abandoned 1982-06-07
24. Interbay Quarry

    Surface metal/non-metal · U S Forest Service · MSHA ID 0404047
    Abandoned 1978-02-23
25. Junction Bar

    Surface metal/non-metal · Century 21 Inc · MSHA ID 0404449
    Abandoned 1984-07-16
26. Lincoln Rock Company

    Surface metal/non-metal · Lincoln Rock Company Inc · MSHA ID 0404980
    Abandoned 1992-06-22
27. Lincoln Rock Quarry

    Surface metal/non-metal · James L Ferry & Son Inc · MSHA ID 0404267
    Abandoned 1978-11-18
28. Little Mad

    Underground metal/non-metal · American Jade & Gold Company · MSHA ID 0404806
    Abandoned 1988-05-26
29. Merz Mine

    Underground metal/non-metal · D & J Mining Company Inc · MSHA ID 0404453
    Abandoned 1982-07-21
30. Miles Pit And Mill

    Surface metal/non-metal · R J Miles Company · MSHA ID 0402067
    Abandoned 1978-07-15
31. Mountain Gate Gravel Quarry

    Surface metal/non-metal · Mountain Gate-Wacker Company · MSHA ID 0404253
    Abandoned 1982-08-09
32. North American Mine

    Surface metal/non-metal · Golconda Limited Partner · MSHA ID 0404442
    Abandoned 1983-07-25
33. Pacific Mine

    Surface metal/non-metal · Guntert & Zimmerman Construction Division Inc · MSHA ID 0404048
    Abandoned 1982-09-07
34. Patterson Plant

    Surface metal/non-metal · CEMEX Construction Materials Pacific, LLC · MSHA ID 0401906
    Abandoned 2020-11-04
35. Pegasus Mine

    Surface metal/non-metal · Pegasus Mining Inc · MSHA ID 0404437
    Abandoned 1982-05-27
36. Phil Reome

    Surface metal/non-metal · Phil Reome, Inc. · MSHA ID 0405560
    Abandoned 2009-01-12
37. Red Star

    Underground metal/non-metal · Red Star Gold Mining Corp · MSHA ID 0404675
    Abandoned 1984-07-16
38. Sanderson Sand & Gravel Pit

    Surface metal/non-metal · Sanderson Aggregates · MSHA ID 0401796
    Abandoned 1979-01-30
39. Stewart Mine

    Underground metal/non-metal · Jval Inc · MSHA ID 0405077
    Abandoned 1990-08-20
40. Swiftshore Mine

    Underground metal/non-metal · Provista Mining Co. · MSHA ID 0405559
    Abandoned 2006-03-22
41. Three Queens

    Underground metal/non-metal · Henry W Magorian · MSHA ID 0404478
    Abandoned 1984-07-16
42. THREE QUEENS MINE

    Underground metal/non-metal · Henry W Magorian · MSHA ID 0405380
    Abandoned 2000-08-01
43. Truro

    Underground metal/non-metal · Wendy Christine Mining Company · MSHA ID 0404400
    Abandoned 1981-10-14
44. UPPER DEMARIA MINE

    Underground metal/non-metal · Jessica Mining Company Llc · MSHA ID 0404991
    Abandoned 2000-01-31
45. WAYNBO DRIFT MINE WAYNE S. TUNNEL

    Surface metal/non-metal · WAYNE'S DRIFT MINE (TUNNEL) · MSHA ID 0405203
    Abandoned 2009-03-05
46. Westside Quartz Mine

    Underground metal/non-metal · Westside Quartz Claim · MSHA ID 0404606
    Abandoned 1985-05-29
47. WILD CAT MINES

    Underground metal/non-metal · Greg & Mike Sykora · MSHA ID 0405379
    Abandoned 2007-06-28
48. You Bet Mill

    Facility metal/non-metal · Pacific Silica Company · MSHA ID 0402733
    Abandoned 1978-07-15

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.