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Abandoned mines › Montana
Abandoned mine inventory

Abandoned mines in Hill County, Montana

Hill County, Montana has 99 mine and prospect features on USGS topographic maps published 1904–1984, including 13 mine openings (shafts, adits and air shafts) and 7 prospect pits; 2 of the features carry a name on the map. OSMRE's abandoned mine land inventory lists 25 problems in the county, 3 of them not yet reclaimed. MSHA's register carries 12 mines in the county with status Abandoned or Abandoned and Sealed.

Every mine and prospect feature the USGS digitized from historical topographic maps covering Hill 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)
99
Mine openings
13
OSMRE problems unreclaimed
3
MSHA mines marked abandoned
12
2 features carry a name7 prospect pits24 quadrangle maps, published 1904–1984 25 OSMRE problems, 22 reclaimed 0 MSHA mines abandoned and sealed
What the features are
  1. Mine openings
    shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
    20 16.1%
  2. Prospect pits and trenches
    shallow exploration diggings that never became a mine
    7 5.6%
  3. Mines and surface workings
    labelled mines, open pits, strip mines, placer and hydraulic workings
    8 6.5%
  4. Quarries, gravel and borrow pits
    construction-material and industrial-mineral extraction
    71 57.3%
  5. Dumps, tailings, spoil and gob
    what mining left above ground
    7 5.6%
  6. Mills, tipples and facilities
    processing plants and hazardous structures
    2 1.6%
  7. Other reclamation problems
    highwalls, subsidence, polluted or clogged water, fires, slides and gases in OSMRE's inventory
    9 7.3%
Named features on the maps2 named · from the USGS compilation
Name on map Feature
Rocky Boy Mine Adit
Silver King Mine Adit

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.

OSMRE abandoned mine land problems25 on inventory
Problem area Problem Status
Flatness Mine P3 Gobs In Reclamation
Galbery P3 Mine Opening In Reclamation
Galbery P3 Spoil Area In Reclamation
Havre Sand & Gravel P2 Dangerous Highwalls Reclamation Completed
Havre Sand & Gravel P3 Pits Reclamation Completed
Larson - Hubbs P2 Portals Reclamation Completed
Larson - Hubbs P2 Subsidence Reclamation Completed
Larson-hubbs P1 Portals Reclamation Completed
Larson-hubbs P2 Subsidence Reclamation Completed
Laursen Mine P1 Vertical Openings Reclamation Completed
Reserve Mine P2 Dangerous Piles & Embankments Reclamation Completed
Reserve Mine P2 Hazardous Equip & Facilities Reclamation Completed
Reserve Mine P2 Portals Reclamation Completed
Reserve Mine P2 Subsidence Reclamation Completed
Roberts Ii P3 Gobs Reclamation Completed
Roberts Ii P3 Mine Opening Reclamation Completed
Rocky Boy Mine P2 Hazardous Equip & Facilities Reclamation Completed
Salice Roberta P3 Spoil Area Reclamation Completed
Scs 29-30 P2 Portals Reclamation Completed
Scs 29-30 P2 Subsidence Reclamation Completed
Scs 29-30 P2 Vertical Openings Reclamation Completed
Scs 29-30 P3 Spoil Area Reclamation Completed
Scs 31 P2 Portals Reclamation Completed
Scs 31 P2 Subsidence Reclamation Completed
Scs 31 P3 Spoil Area Reclamation Completed

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.

MSHA-registered mines with status Abandoned12 on register
  1. Baltrusch Portable Crusher
    Surface metal/non-metal · Baltrusch Construction Company Inc · MSHA ID 2401406
    Abandoned
  2. Bill Baltrusch Construction Inc
    Surface metal/non-metal · Bill Baltrusch Construction Inc · MSHA ID 2402114
    Abandoned
  3. Havre Sand & Gravel & Plant
    Surface metal/non-metal · Havre Sand & Gravel Inc · MSHA ID 2400467
    Abandoned
  4. Hill County
    Surface metal/non-metal · Hill County Road Department · MSHA ID 2402008
    Abandoned
  5. Houtzel Pit
    Surface metal/non-metal · Rock Solid Materials, Inc · MSHA ID 2402730
    Abandoned
  6. Jaw Cone Crusher
    Surface metal/non-metal · Otto Contruction Inc · MSHA ID 2402397
    Abandoned
  7. Onsite Recycling 1
    Surface metal/non-metal · Onsite Recycling · MSHA ID 2402553
    Abandoned
  8. Pasco
    Surface metal/non-metal · Pasco Ready Mix · MSHA ID 2402726
    Abandoned
  9. Pasco ready mix
    Surface metal/non-metal · Pasco ready mix · MSHA ID 2402689
    Abandoned
  10. Portable Operation One
    Surface metal/non-metal · Storm Water Const Inc · MSHA ID 2402608
    Abandoned
  11. Tesab Crusher
    Surface metal/non-metal · Otto Construction Inc · MSHA ID 2402192
    Abandoned
  12. WARHANK WASH PLANT
    Surface metal/non-metal · Warhank Sand & Gravel · MSHA ID 2401465
    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 44
Gravel Pit 26
Adit 8
Prospect Pit 7
Mine Shaft 5
P2 Subsidence 5
Open Pit Mine or Quarry 5
P3 Spoil Area 4
P2 Portals 4
Open Pit Mine 3
P3 Gobs 2
P3 Mine Opening 2
P2 Hazardous Equip & Facilities 2
P2 Dangerous Highwalls 1
P2 Vertical Openings 1
P2 Dangerous Piles & Embankments 1
Quarry 1
P3 Pits 1
P1 Portals 1
P1 Vertical Openings 1
Other counties in MontanaAll 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.