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Abandoned mines › Idaho
Abandoned mine inventory

Abandoned mines in Twin Falls County, Idaho

Twin Falls County, Idaho has 139 mine and prospect features on USGS topographic maps published 1949–2001, including 4 prospect pits. MSHA's register carries 43 mines in the county with status Abandoned or Abandoned and Sealed.

Every mine and prospect feature the USGS digitized from historical topographic maps covering Twin Falls 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)
139
Mine openings
0
OSMRE problems unreclaimed
0
MSHA mines marked abandoned
43
0 features carry a name4 prospect pits38 quadrangle maps, published 1949–2001 0 MSHA mines abandoned and sealed
What the features are
  1. Prospect pits and trenches
    shallow exploration diggings that never became a mine
    4 2.9%
  2. Quarries, gravel and borrow pits
    construction-material and industrial-mineral extraction
    135 97.1%
MSHA-registered mines with status Abandoned43 on register
  1. #24 Screener
    Surface metal/non-metal · Buhl Highway District · MSHA ID 1001927
    Abandoned
  2. 7406
    Surface metal/non-metal · Gordon Paving Company Inc. · MSHA ID 1001691
    Abandoned
  3. 7470
    Surface metal/non-metal · Gordon Paving Company Inc. · MSHA ID 1001308
    Abandoned
  4. Addison Pit
    Surface metal/non-metal · Doug McCoy Construction Inc · MSHA ID 1002151
    Abandoned
  5. Balanced Rock Sand & Gravel Inc
    Surface metal/non-metal · Balanced Rock Sand & Gravel Inc · MSHA ID 1002046
    Abandoned
  6. Champ Gray Pit
    Surface metal/non-metal · Northwest Crane Rigging & Transport Company · MSHA ID 1000953
    Abandoned
  7. Colonial Concrete Plant
    Surface metal/non-metal · Colonial Concrete Inc · MSHA ID 1000312
    Abandoned
  8. CRUSHER #1
    Surface metal/non-metal · Twin Falls Crane · MSHA ID 1001967
    Abandoned
  9. Crusher 2
    Surface metal/non-metal · Magic Valley Crushing & Excavation · MSHA ID 1002339
    Abandoned
  10. DALE ASLETT PORTABLE PLANT
    Surface metal/non-metal · Dale Aslett Sand & Gravel Inc · MSHA ID 1001883
    Abandoned
  11. Hansen Pit
    Surface metal/non-metal · Northwest Crane Rigging & Transport Company · MSHA ID 1001338
    Abandoned
  12. Hansen Pit
    Surface metal/non-metal · Northwest Sand & Gravel Inc · MSHA ID 1002010
    Abandoned
  13. Hollister Pit
    Surface metal/non-metal · D. B. Trucking Inc · MSHA ID 1002016
    Abandoned
  14. Inkom Silica Quarry
    Surface metal/non-metal · Ash Grove Cement West Inc · MSHA ID 1001016
    Abandoned
  15. LJ Plant
    Surface metal/non-metal · Tri-C Inc · MSHA ID 1002038
    Abandoned
  16. Northwest Portable Plant #1
    Surface metal/non-metal · Northwest Crane Rigging & Transport Company · MSHA ID 1001769
    Abandoned
  17. Plant #4
    Surface metal/non-metal · Tri-C Inc. · MSHA ID 1002077
    Abandoned
  18. Plant 1
    Surface metal/non-metal · Clark Rock & Gravel · MSHA ID 1002234
    Abandoned
  19. Plant 3
    Surface metal/non-metal · Tri-C Inc. · MSHA ID 1002070
    Abandoned
  20. Plant K
    Surface metal/non-metal · Tri-C Inc · MSHA ID 1001926
    Abandoned
  21. Portable #1
    Surface metal/non-metal · Mountain View Gravel · MSHA ID 1001968
    Abandoned
  22. PORTABLE PLANT # 1
    Surface metal/non-metal · Loughmiller Reclamation Llc · MSHA ID 1001992
    Abandoned
  23. PORTABLE PLANT #1
    Surface metal/non-metal · O-K Paving Inc · MSHA ID 1001934
    Abandoned
  24. PORTABLE PLANT #3
    Surface metal/non-metal · Tri-C Inc · MSHA ID 1001975
    Abandoned
  25. Portable Screening Plant
    Surface metal/non-metal · Snake River Construction Co., Inc. · MSHA ID 1002053
    Abandoned
  26. Richfield Pit
    Surface metal/non-metal · Idaho Concrete Company · MSHA ID 1002055
    Abandoned
  27. Rim Rock Pit
    Surface metal/non-metal · Twin Falls Construction Company Inc · MSHA ID 1000358
    Abandoned
  28. River Dredge
    Surface metal/non-metal · Northwest Crane Rigging & Transport Company · MSHA ID 1001821
    Abandoned
  29. Rock Creek
    Surface metal/non-metal · Northwest Crane Rigging & Transport Company · MSHA ID 1001732
    Abandoned
  30. SALMON FALLS CREEK PIT RP-1283
    Surface metal/non-metal · Loughmiller Reclamation Llc · MSHA ID 1001991
    Abandoned
  31. Screening plant
    Surface metal/non-metal · KD Excavation LLC · MSHA ID 1002182
    Abandoned
  32. SOUTH FORK PIT
    Surface metal/non-metal · O-K Paving Inc · MSHA ID 1001922
    Abandoned
  33. State Pit Tf 56
    Surface metal/non-metal · Beymer Paving Inc · MSHA ID 1001330
    Abandoned
  34. State Pit Tf 79
    Surface metal/non-metal · Twin Falls Construction Company Inc · MSHA ID 1001419
    Abandoned
  35. State Pit Tf70
    Surface metal/non-metal · Beymer Paving Inc · MSHA ID 1001337
    Abandoned
  36. Sun Trap Pit
    Surface metal/non-metal · Sun Trap Sand & Gravel · MSHA ID 1001675
    Abandoned
  37. Tf 58 Ring Pit
    Surface metal/non-metal · Peter Kiewit Sons' Company · MSHA ID 1001379
    Abandoned
  38. Tri-C
    Surface metal/non-metal · Tri-C Inc · MSHA ID 1001665
    Abandoned
  39. Tri-Harder Farms
    Surface metal/non-metal · Tri-Harder Farms · MSHA ID 1002086
    Abandoned
  40. Twin Falls Crushing P P
    Surface metal/non-metal · Twin Falls Crushing, Inc. · MSHA ID 1001460
    Abandoned
  41. TWIN FALLS PLANT
    Surface metal/non-metal · Monroc Inc · MSHA ID 1000639
    Abandoned
  42. Winn & Company Inc Portable Plant
    Surface metal/non-metal · Winn & Company Inc · MSHA ID 1001743
    Abandoned
  43. Wynn Pit
    Surface metal/non-metal · Western Construction Inc · MSHA ID 1001378
    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 80
Gravel Pit 33
Borrow Pit 15
Prospect Pit 4
Quarry 4
Borrow Pit 2
Gravel/Borrow Pit - Undifferentiated 1
Other counties in IdahoAll 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.