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Abandoned mines › New Hampshire
Abandoned mine inventory

Abandoned mines in Carroll County, New Hampshire

Carroll County, New Hampshire has 166 mine and prospect features on USGS topographic maps published 1956–1995. MSHA's register carries 15 mines in the county with status Abandoned or Abandoned and Sealed.

Every mine and prospect feature the USGS digitized from historical topographic maps covering Carroll 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)
166
Mine openings
0
OSMRE problems unreclaimed
0
MSHA mines marked abandoned
15
0 features carry a name0 prospect pits25 quadrangle maps, published 1956–1995 0 MSHA mines abandoned and sealed
What the features are
  1. Quarries, gravel and borrow pits
    construction-material and industrial-mineral extraction
    166 100.0%
MSHA-registered mines with status Abandoned15 on register
  1. Ambrose Brothers Inc-Tamworth Pit
    Surface metal/non-metal · Ambrose Brothers Inc · MSHA ID 2700149
    Abandoned
  2. CONWAY SAND & GRAVEL C622
    Surface metal/non-metal · Pike Industries Inc · MSHA ID 2700107
    Abandoned
  3. Dow Sand & Gravel
    Surface metal/non-metal · Dow Sand & Gravel · MSHA ID 2700296
    Abandoned
  4. Hanson Pit
    Surface metal/non-metal · Robert Hanson Excavating, Inc. · MSHA ID 2700457
    Abandoned
  5. LA Drew-Portable Plant
    Surface metal/non-metal · Pike Industries Inc · MSHA ID 2700289
    Abandoned
  6. Madison Quarry
    Surface metal/non-metal · Georgia Stone Management LLC · MSHA ID 2700240
    Abandoned
  7. Ossipee Gravel Plant
    Surface metal/non-metal · Norris Harriman Construction & En · MSHA ID 2700133
    Abandoned
  8. OSSIPEE SAND & GRAVEL
    Surface metal/non-metal · Ossipee Mountain Land Company Llc · MSHA ID 2700371
    Abandoned
  9. Paul E Taylor Company
    Surface metal/non-metal · Paul E Taylor Company · MSHA ID 2700431
    Abandoned
  10. Pine River Aggregates
    Surface metal/non-metal · Pine River Aggregates · MSHA ID 2700297
    Abandoned
  11. Portable
    Surface metal/non-metal · GFS Corp. General Contracting Services · MSHA ID 2700421
    Abandoned
  12. PORTABLE CRUSHING PLANT 128X108
    Surface metal/non-metal · Ambrose Brothers Inc · MSHA ID 2700315
    Abandoned
  13. Portable Screening Plant
    Surface metal/non-metal · L A Drew Inc · MSHA ID 2700452
    Abandoned
  14. TAMWORTH, N.H. PLANT
    Surface metal/non-metal · Brox Industries Inc · MSHA ID 2700283
    Abandoned
  15. WOLFEBORO SAND & GRAVEL
    Surface metal/non-metal · Wolfeboro Sand & Gravel Inc · MSHA ID 2700363
    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 51
Gravel Pit 49
Sand Pit 23
Sand and Gravel Pit 17
Sand Pit 13
Sand and Gravel Pit 6
Gravel/Borrow Pit - Undifferentiated 3
Gravel/Borrow Pit - Undifferentiated 3
Quarry 1
Other counties in New HampshireAll 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.