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Abandoned mines › California
Abandoned mine inventory

Abandoned mines in Lassen County, California

Lassen County, California has 532 mine and prospect features on USGS topographic maps published 1954–1995, including 60 mine openings (shafts, adits and air shafts) and 139 prospect pits; 9 of the features carry a name on the map. MSHA's register carries 22 mines in the county with status Abandoned or Abandoned and Sealed.

Every mine and prospect feature the USGS digitized from historical topographic maps covering Lassen 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)
532
Mine openings
60
OSMRE problems unreclaimed
0
MSHA mines marked abandoned
22
9 features carry a name139 prospect pits82 quadrangle maps, published 1954–1995 0 MSHA mines abandoned and sealed
What the features are
  1. Mine openings
    shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
    60 11.3%
  2. Prospect pits and trenches
    shallow exploration diggings that never became a mine
    139 26.1%
  3. Mines and surface workings
    labelled mines, open pits, strip mines, placer and hydraulic workings
    14 2.6%
  4. Quarries, gravel and borrow pits
    construction-material and industrial-mineral extraction
    318 59.8%
  5. Dumps, tailings, spoil and gob
    what mining left above ground
    1 0.2%
Named features on the maps9 named · from the USGS compilation
Name on map Feature
Castaic Mine Adit
Corona Mine Adit
Eagle Rock Mine Open Pit Mine
Fly Dutchman Mine Prospect Pit
Grey Goose Mine Open Pit Mine
Harris Mine Adit
Honey Lake Mine Adit
Red Rock Mine Adit
Standish Gravel Pit Gravel Pit area

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 Abandoned22 on register
  1. 1000 Springs Pit
    Surface metal/non-metal · TNS TRUCKING & READY MIX · MSHA ID 0405739
    Abandoned
  2. CUMMINGS FARMS
    Surface metal/non-metal · Cummings Farms · MSHA ID 0405419
    Abandoned
  3. Doyle Pit
    Surface metal/non-metal · Baldwin Contracting Company Inc · MSHA ID 0401704
    Abandoned
  4. Hayden Hill Mine
    Surface metal/non-metal · Lassen Gold Mining Inc · MSHA ID 0405159
    Abandoned
  5. Hayden Hill Operation
    Surface metal/non-metal · Pecos Resources Inc · MSHA ID 0404699
    Abandoned
  6. Honey Lake
    Surface metal/non-metal · Baldwin Contracting Co Inc · MSHA ID 0405345
    Abandoned
  7. Honey Lake Aggregates
    Surface metal/non-metal · Baldwin Contracting Company Inc · MSHA ID 0405160
    Abandoned
  8. Honey Lake Mine
    Underground metal/non-metal · Marshall Earth Resources Inc · MSHA ID 0404762
    Abandoned
  9. Lassen Pit & Mill
    Surface metal/non-metal · Lassen Sand & Gravel · MSHA ID 0401836
    Abandoned
  10. Lassen Rock Products
    Surface metal/non-metal · Baldwin Contracting Company Inc · MSHA ID 0404811
    Abandoned
  11. Lassenite
    Surface metal/non-metal · Lassenite Industries Inc · MSHA ID 0403993
    Abandoned
  12. Long Valley Pozzolan
    Surface metal/non-metal · Western Pozzolan Corporation · MSHA ID 0405700
    Abandoned
  13. Portable Screen 1
    Surface metal/non-metal · Hat Creek Construction · MSHA ID 0405876
    Abandoned
  14. RC-2 Portable Rock Crusher
    Surface metal/non-metal · Lassen County Department Of Public Works · MSHA ID 0405396
    Abandoned
  15. RC-3 Portable Rock Crusher
    Surface metal/non-metal · Lassen County Department Of Public Works · MSHA ID 0405397
    Abandoned
  16. Sierra Lady Site 1
    Surface metal/non-metal · US Mine Corp · MSHA ID 0405872
    Abandoned
  17. Skedadele Pit
    Surface metal/non-metal · Lassen Sand & Gravel · MSHA ID 0404628
    Abandoned
  18. Standish Pit
    Surface metal/non-metal · Lassen County Road Dept · MSHA ID 0401028
    Abandoned
  19. T-K Springs Quarry
    Surface metal/non-metal · Turn-Key Construction Services, Inc. · MSHA ID 0405844
    Abandoned
  20. Turner Pit
    Surface metal/non-metal · Al Pombo, Inc · MSHA ID 0405814
    Abandoned
  21. Viewland Pit
    Surface metal/non-metal · Miller'S Custom Work Inc · MSHA ID 0404887
    Abandoned
  22. VIEWLAND PIT
    Surface metal/non-metal · Larimer-Surian Construction Inc · MSHA ID 0405465
    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
Prospect Pit 139
Borrow Pit 138
Gravel Pit 59
Cinder Pit 45
Adit 36
Mine Shaft 24
Quarry 18
Borrow Pit 18
Gravel Pit 15
Cinder Pit 15
Open Pit Mine 5
Open Pit Mine or Quarry 5
Sand Pit 5
Strip Mine 3
Sand Pit 3
Quarry - Rock 1
Mine Dump 1
Quarry 1
Disturbed Surface - Pit 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.