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Abandoned mines › New Jersey
Abandoned mine inventory

Abandoned mines in Middlesex County, New Jersey

Middlesex County, New Jersey has 187 mine and prospect features on USGS topographic maps published 1942–1995. MSHA's register carries 13 mines in the county with status Abandoned or Abandoned and Sealed.

Every mine and prospect feature the USGS digitized from historical topographic maps covering Middlesex 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)
187
Mine openings
0
OSMRE problems unreclaimed
0
MSHA mines marked abandoned
13
0 features carry a name0 prospect pits10 quadrangle maps, published 1942–1995 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
    137 73.3%
  2. Quarries, gravel and borrow pits
    construction-material and industrial-mineral extraction
    50 26.7%
MSHA-registered mines with status Abandoned13 on register
  1. Amboy Aggregates
    Facility metal/non-metal · Amboy Aggregates J.V. · MSHA ID 2800973
    Abandoned
  2. DALLENBACH SAND PLANT
    Surface metal/non-metal · Dallenbach Sand Company Inc · MSHA ID 2800498
    Abandoned
  3. East Brunswick
    Surface metal/non-metal · Pinnacle Materials Inc · MSHA ID 2800522
    Abandoned
  4. Glen-Rock Pit And Mill
    Surface metal/non-metal · Glen Rock Concrete Products · MSHA ID 2800516
    Abandoned
  5. Gordon Dredge And Plant
    Surface metal/non-metal · Gordon'S Sand & Gravel Company · MSHA ID 2800872
    Abandoned
  6. HOWELL PIT
    Surface metal/non-metal · Pinnacle Materials Inc · MSHA ID 2801008
    Abandoned
  7. Monroe Pit
    Surface metal/non-metal · Stavola Mining and Development Company · MSHA ID 2801009
    Abandoned
  8. MONROE TOWNSHIP PIT
    Surface metal/non-metal · Herbert Materials Inc · MSHA ID 2800996
    Abandoned
  9. Raritan River Sand Company Incorporated
    Surface metal/non-metal · Raritan River Sand Company Inc · MSHA ID 2800548
    Abandoned
  10. RECHARGE RESERVOIR
    Surface metal/non-metal · E M E Inc/R W Vogel Inc · MSHA ID 2800993
    Abandoned
  11. South Plainfield Mill
    Facility metal/non-metal · Cyprus Mines Corp · MSHA ID 2800959
    Abandoned
  12. South River Sand Company
    Surface metal/non-metal · South River Sand Company · MSHA ID 2800552
    Abandoned
  13. The Schundler Company
    Facility metal/non-metal · Schundler Company · MSHA ID 2800965
    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
Open Pit Mine or Quarry 65
Open Pit Mine or Quarry 36
Disturbed Surface 36
Gravel Pit 15
Gravel Pit 9
Clay Pit 8
Sand and Gravel Pit 7
Clay Pit 6
Sand and Gravel Pit 2
Gravel/Borrow Pit - Undifferentiated 2
Gravel/Borrow Pit - Undifferentiated 1
Other counties in New JerseyAll 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.