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Abandoned mines › Maine
Abandoned mine inventory

Abandoned mines in Knox County, Maine

Knox County, Maine has 151 mine and prospect features on USGS topographic maps published 1904–1983. MSHA's register carries 27 mines in the county with status Abandoned or Abandoned and Sealed.

Every mine and prospect feature the USGS digitized from historical topographic maps covering Knox 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)
151
Mine openings
0
OSMRE problems unreclaimed
0
MSHA mines marked abandoned
27
0 features carry a name0 prospect pits20 quadrangle maps, published 1904–1983 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
    28 18.5%
  2. Quarries, gravel and borrow pits
    construction-material and industrial-mineral extraction
    123 81.5%
MSHA-registered mines with status Abandoned27 on register
  1. Appletton Pit
    Surface metal/non-metal · H A Conary · MSHA ID 1700406
    Abandoned
  2. Astec/KPI 205S
    Surface metal/non-metal · Jake Barbour Inc · MSHA ID 1700806
    Abandoned
  3. Davis Pit
    Surface metal/non-metal · John J Borzoni · MSHA ID 1700453
    Abandoned
  4. Division 5 Portable Unit
    Surface metal/non-metal · Maine Department Of Transportation · MSHA ID 1700355
    Abandoned
  5. Foley Pit
    Surface metal/non-metal · Maine Department Of Transportation · MSHA ID 1700364
    Abandoned
  6. Foley Pit
    Surface metal/non-metal · Earle Doc Maxcy · MSHA ID 1700516
    Abandoned
  7. FOX ISLAND QUARRY
    Surface metal/non-metal · FOX ISLAND GRANITE CO. INC. · MSHA ID 1700729
    Abandoned
  8. Hart Pit
    Surface metal/non-metal · Hartland, Inc. · MSHA ID 1700882
    Abandoned
  9. HERITAGE VALLEY QUARRY
    Surface metal/non-metal · J.C. STONE INC. · MSHA ID 1700850
    Abandoned
  10. JBI - Crushing / Screening
    Surface metal/non-metal · Jake Barbour Inc · MSHA ID 1700801
    Abandoned
  11. Liberty Pit Crusher
    Surface metal/non-metal · Ferraiolo Construction Company Inc · MSHA ID 1700504
    Abandoned
  12. Marriners, Inc.
    Surface metal/non-metal · Marriners, Inc. · MSHA ID 1700360
    Abandoned
  13. Metso Cone Crusher LT200HP
    Surface metal/non-metal · Jake Barbour Inc · MSHA ID 1701019
    Abandoned
  14. OE-15 Extec Screener
    Surface metal/non-metal · Jake Barbour Inc · MSHA ID 1700804
    Abandoned
  15. Portable 1
    Surface metal/non-metal · Dragon Products Company · MSHA ID 1700431
    Abandoned
  16. Portable 3
    Surface metal/non-metal · Dragon Products Company · MSHA ID 1700590
    Abandoned
  17. Portable Screen No 55-720
    Surface metal/non-metal · Starr Brothers Inc · MSHA ID 1700251
    Abandoned
  18. Ranta Pit And Mill
    Surface metal/non-metal · Maine Department Of Transportation · MSHA ID 1700365
    Abandoned
  19. THOMASTON CEMENT PLANT
    Facility metal/non-metal · Dragon Products Company, Inc. · MSHA ID 1700022
    Abandoned
  20. Thomaston Mill
    Facility metal/non-metal · Chemrock Corp · MSHA ID 1700561
    Abandoned
  21. Thomaston Quarry
    Surface metal/non-metal · Martin Marietta Corp · MSHA ID 1700499
    Abandoned
  22. Thomaston Quarry And Mill
    Surface metal/non-metal · Marine Trading & Transportation I · MSHA ID 1700026
    Abandoned
  23. Union Plant
    Surface metal/non-metal · Dragon Products Company · MSHA ID 1700007
    Abandoned
  24. Warren Pit
    Surface metal/non-metal · Arthur D Henry-Contractor · MSHA ID 1700391
    Abandoned
  25. Washington
    Surface metal/non-metal · J.C. Stone, Inc. · MSHA ID 1700950
    Abandoned
  26. Washington Crusher
    Surface metal/non-metal · Eurovia Atlantic Coast LLC · MSHA ID 1700847
    Abandoned
  27. Washington Quarry
    Surface metal/non-metal · Eurovia Atlantic Coast LLC · MSHA ID 1700845
    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 60
Gravel Pit 19
Open Pit Mine or Quarry 19
Borrow Pit 17
Gravel/Borrow Pit - Undifferentiated 10
Quarry 8
Disturbed Surface 8
Quarry 5
Borrow Pit 3
Sand Pit 1
Open Pit Mine or Quarry 1
Other counties in MaineAll 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.