Abandoned mines in Trinity County, California

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   227 33.1%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   168 24.5%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   93 13.6%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   33 4.8%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   164 23.9%

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. Arbuckle Portable Crusher

   Surface metal/non-metal · Coffee Creek Trinity Sand & Gravel Inc · MSHA ID 0402898
   Abandoned 1991-08-09
2. Bluebird Mine #1

   Surface metal/non-metal · Ross Mining · MSHA ID 0404967
   Abandoned 1990-03-14
3. Bonanza King

   Underground metal/non-metal · Jefferson State Exploration & Development Co · MSHA ID 0404753
   Abandoned 1986-03-18
4. Brown Bear Mine

   Underground metal/non-metal · Shasta Bird Mine Associates · MSHA ID 0403206
   Abandoned 1983-07-25
5. Bully Choop

   Underground metal/non-metal · Trafalgar Mining Company · MSHA ID 0404459
   Abandoned 1982-08-10
6. Douglas City Pit And Mill

   Surface metal/non-metal · Trinity Sand & Gravel Company · MSHA ID 0403304
   Abandoned 1981-05-18
7. ELJAY PLANT PORTABLE

   Surface metal/non-metal · CONCRETE AGGREGATE PRODUCTS INC · MSHA ID 0405585
   Abandoned 2009-04-01
8. Globe Mine

   Underground metal/non-metal · Trafalgar Mining Company · MSHA ID 0404460
   Abandoned 1982-08-10
9. Gold Dollar Claims

   Surface metal/non-metal · R Johnson Inc · MSHA ID 0404966
   Abandoned 1990-03-14
10. Kelly Or Kelly Mine

    Underground metal/non-metal · Natural Energy Resources Inc · MSHA ID 0404385
    Abandoned 1983-10-19
11. La Grange Ii Mine

    Surface metal/non-metal · Micron Mining · MSHA ID 0404943
    Abandoned 1988-08-16
12. La Grange Pit

    Surface metal/non-metal · La Grange Aggregates Inc · MSHA ID 0404371
    Abandoned 1983-07-25
13. Mt Minerals Main

    Surface metal/non-metal · Seros Mining · MSHA ID 0404476
    Abandoned 1982-07-30
14. Norley'S Mt Pmc

    Surface metal/non-metal · Norley'S Mt Mining Company · MSHA ID 0404477
    Abandoned 1982-07-14
15. Patience

    Underground metal/non-metal · White Hope Mining · MSHA ID 0404384
    Abandoned 1982-07-21
16. Portable #1

    Surface metal/non-metal · Don Wesner Inc · MSHA ID 0402905
    Abandoned 2015-05-14
17. Portable Rock Crushing Unit

    Surface metal/non-metal · Eagle Rock Inc. · MSHA ID 0405865
    Abandoned 2015-06-01
18. Pyramid Mineral Resources

    Underground metal/non-metal · Rainbow Mineral Resources · MSHA ID 0404383
    Abandoned 1982-07-30
19. Shale Pit

    Surface metal/non-metal · Duane Brookins · MSHA ID 0405268
    Abandoned 1996-07-17
20. Smith Pit

    Surface metal/non-metal · Trinity Sand and Gravel · MSHA ID 0405007
    Abandoned 2022-07-20
21. Strode

    Underground metal/non-metal · Jefferson State Exploration & Development Co · MSHA ID 0404754
    Abandoned 1986-03-18
22. Tangle Blue

    Underground metal/non-metal · Jefferson State Exploration & Development Co · MSHA ID 0404755
    Abandoned 1986-03-18
23. TRINITY MINE

    Underground metal/non-metal · Canadian Reserve Inc · MSHA ID 0405291
    Abandoned 2001-01-26
24. Trinity Quarry

    Surface metal/non-metal · Gordenker Turkey Farms Inc · MSHA ID 0404984
    Abandoned 1993-03-31
25. W Martin And Associates

    Surface metal/non-metal · W Martin & Associates · MSHA ID 0404866
    Abandoned 1988-08-16
26. Zenia Pit

    Surface metal/non-metal · B & C Sand & Gravel Co · MSHA ID 0404055
    Abandoned 1979-04-30

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.