Abandoned mines in Huntingdon County, Pennsylvania

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   9 5.4%
2. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   61 36.7%
3. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   69 41.6%
4. Dumps, tailings, spoil and gob

   what mining left above ground
   7 4.2%
5. Mills, tipples and facilities

   processing plants and hazardous structures
   1 0.6%
6. Other reclamation problems

   highwalls, subsidence, polluted or clogged water, fires, slides and gases in OSMRE's inventory
   19 11.4%

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.

Problem types carry OSMRE's priority prefix: P1 and P2 are threats to health, safety and property, P3 is environmental. A problem area is a cluster of problems reclaimed as one project; several rows can share one location.

1. Barnetts Mineral Extraction

   Surface coal · Richard Zenoble · MSHA ID 3607065
   Abandoned 1981-01-29
2. Clark No 1 Surface

   Surface coal · Bitumco Mining Company Inc · MSHA ID 3606538
   Abandoned 1977-10-01
3. Coalmont Coal

   Underground coal · Coalmont Coal · MSHA ID 3606570
   Abandoned and Sealed 1979-03-15
4. Jesse Ryan No 2 Strip

   Surface coal · Broad Top Energies Inc · MSHA ID 3606423
   Abandoned 1979-10-01
5. Juniata Processing LLC

   Facility coal · Juniata Processing LLC · MSHA ID 3609678
   Abandoned 2010-03-04
6. Lippman 4800R Serial# 4181

   Surface metal/non-metal · Contract Crushing / Construction Inc · MSHA ID 3610398
   Abandoned 2024-08-23
7. Mc Connellstown Quarry And Mill

   Surface metal/non-metal · New Enterprise Stone & Lime Company Inc · MSHA ID 3600197
   Abandoned 1993-08-12
8. Mercer Mine

   Surface coal · Broadtop Coal Company Inc · MSHA ID 3608449
   Abandoned 1994-01-03
9. Mount Union Quarry

   Surface metal/non-metal · Harbison-Walker Refractories U S · MSHA ID 3600106
   Abandoned 1983-01-04
10. Mount Union Quarry And Mill

    Facility metal/non-metal · North American Refractories Company · MSHA ID 3600180
    Abandoned 1982-05-21
11. Mount Union Works

    Facility metal/non-metal · Harbison-Walker Refractories U S · MSHA ID 3605390
    Abandoned 1982-05-21
12. No 1 Strip

    Surface coal · Spickler Coal Company · MSHA ID 3601319
    Abandoned 1976-04-27
13. Round Knob

    Surface coal · Ferlitch Construction Inc · MSHA ID 3607506
    Abandoned 2018-07-20
14. Round Knob

    Surface coal · Ferlitch Construction Company Inc · MSHA ID 3609578
    Abandoned 2009-05-28
15. Shade Gap Quarry & Mill

    Surface metal/non-metal · Parsons Stone & Lime Co · MSHA ID 3600214
    Abandoned 1978-03-13

Status and date are as reported to MSHA by the operator. Each mine's own page carries its accident, citation and inspection record.

• Clearfield County 1,769
• Armstrong County 961
• Jefferson County 948
• Clarion County 943
• Butler County 920
• Westmoreland County 906
• Indiana County 897
• Somerset County 868
• Fayette County 861
• Schuylkill County 836
• Allegheny County 763
• Cambria County 753

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.