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Abandoned mines › California
Abandoned mine inventory

Abandoned mines in San Joaquin County, California

San Joaquin County, California has 96 mine and prospect features on USGS topographic maps published 1907–1987; 2 of the features carry a name on the map. MSHA's register carries 21 mines in the county with status Abandoned or Abandoned and Sealed.

Every mine and prospect feature the USGS digitized from historical topographic maps covering San Joaquin County, every OSMRE abandoned mine land problem in the county, and every MSHA-registered mine here with status Abandoned. Named features are listed below; unnamed ones are counted by type. Locations are deliberately not shown: this page says what abandoned workings are in the county, not where to find them. They are dangerous and should not be entered.

Mapped mine features (USGS)
96
Mine openings
0
OSMRE problems unreclaimed
0
MSHA mines marked abandoned
21
2 features carry a name0 prospect pits29 quadrangle maps, published 1907–1987 0 MSHA mines abandoned and sealed
What the features are
  1. Mines and surface workings
    labelled mines, open pits, strip mines, placer and hydraulic workings
    4 4.2%
  2. Quarries, gravel and borrow pits
    construction-material and industrial-mineral extraction
    54 56.2%
  3. Dumps, tailings, spoil and gob
    what mining left above ground
    37 38.5%
  4. Mills, tipples and facilities
    processing plants and hazardous structures
    1 1.0%
Named features on the maps2 named · from the USGS compilation
Name on map Feature
Ladd Mine Open Pit Mine
Manganese Mill Mill Site

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.

MSHA-registered mines with status Abandoned21 on register
  1. A Plus Materials (Brown Sand)
    Surface metal/non-metal · A-Plus Materials Recycling Inc · MSHA ID 0405377
    Abandoned
  2. BROWN SAND INC
    Surface metal/non-metal · Brown Sand Inc · MSHA ID 0404284
    Abandoned
  3. BROWN SAND PLANT #4
    Facility metal/non-metal · Brown Sand Inc · MSHA ID 0404985
    Abandoned
  4. Clements Plant
    Surface metal/non-metal · Teichert Aggregates · MSHA ID 0402694
    Abandoned
  5. Clements Rock Plant
    Surface metal/non-metal · George Reed Inc · MSHA ID 0401727
    Abandoned
  6. El Rancho Rock & Sand Incorporated
    Surface metal/non-metal · El Rancho Rock & Sand Inc · MSHA ID 0402695
    Abandoned
  7. Kasson Road Pit
    Surface metal/non-metal · F T G Construction Materials Inc · MSHA ID 0405129
    Abandoned
  8. Mossdale Rd Lathrop
    Surface metal/non-metal · F T G Construction Materials Inc · MSHA ID 0405483
    Abandoned
  9. Plant #1
    Surface metal/non-metal · Advanced Rock Crushing Service LLC · MSHA ID 0405792
    Abandoned
  10. Plant #2
    Surface metal/non-metal · Advanced Rock Crushing Service, LLC · MSHA ID 0405864
    Abandoned
  11. Plant #3
    Surface metal/non-metal · Advanced Rock Crushing Service, LLC · MSHA ID 0405866
    Abandoned
  12. Portable Crusher - A
    Surface metal/non-metal · Claude C Wood Company · MSHA ID 0404691
    Abandoned
  13. Portable Operation Plant #1
    Surface metal/non-metal · Ford Construction Company Inc · MSHA ID 0405758
    Abandoned
  14. Portable Plant #3
    Surface metal/non-metal · Ford Construction Company Inc · MSHA ID 0405760
    Abandoned
  15. Portable Plant #4
    Surface metal/non-metal · California Rock Crusher Corp · MSHA ID 0405745
    Abandoned
  16. RAMROCK-BRANDT ROAD
    Surface metal/non-metal · Ramrock Leasing & Equipment Company Inc · MSHA ID 0405439
    Abandoned
  17. STOCKTON MILL
    Facility metal/non-metal · Chemical Lime Company Of Arizona · MSHA ID 0405102
    Abandoned
  18. Tracy Kerlinger Plant
    Surface metal/non-metal · CEMEX Construction Materials Pacific, LLC · MSHA ID 0401895
    Abandoned
  19. Tracy Pit
    Surface metal/non-metal · Granite Construction Co · MSHA ID 0404345
    Abandoned
  20. VALLEY ROCK
    Surface metal/non-metal · CalMat Co · MSHA ID 0405042
    Abandoned
  21. Windler Pit
    Surface metal/non-metal · F T G Construction Materials Inc · MSHA ID 0404790
    Abandoned

Status and date are as reported to MSHA by the operator. Each mine's own page carries its accident, citation and inspection record.

By source vocabularythe publishers' own terms
Feature type Features
Gravel Pit 31
Tailings - Dredge 24
Tailings - Undifferentiated 12
Gravel Pit 8
Gravel/Borrow Pit - Undifferentiated 6
Clay Pit 4
Clay Pit 2
Disturbed Surface 2
Borrow Pit 2
Mill Site 1
Open Pit Mine or Quarry 1
Sand Pit 1
Tailings - Pond 1
Open Pit Mine 1
Other counties in CaliforniaAll counties →
How to read these numbers

A USGS feature is a symbol on a historical topographic map, there when the map was surveyed; it may since have been sealed, reclaimed, built over or reopened as a working mine, and the map does not say which. An OSMRE row is a problem the abandoned mine land program tracks, not a mine. An MSHA mine is a registered operation whose operator reported abandonment, a record that starts in the 1970s. The three overlap and are never added together. The county is assigned from each feature's coordinates against the Census 2023 county boundaries. The full method is on the national page.

Sources
  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.