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Abandoned mines › Montana
Abandoned mine inventory

Abandoned mines in Stillwater County, Montana

Stillwater County, Montana has 57 mine and prospect features on USGS topographic maps published 1939–1996, including 9 mine openings (shafts, adits and air shafts) and 5 prospect pits; 3 of the features carry a name on the map. OSMRE's abandoned mine land inventory lists 7 problems in the county, 6 of them not yet reclaimed. MSHA's register carries 14 mines in the county with status Abandoned or Abandoned and Sealed.

Every mine and prospect feature the USGS digitized from historical topographic maps covering Stillwater 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)
57
Mine openings
9
OSMRE problems unreclaimed
6
MSHA mines marked abandoned
14
3 features carry a name5 prospect pits23 quadrangle maps, published 1939–1996 7 OSMRE problems, 1 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
    11 17.2%
  2. Prospect pits and trenches
    shallow exploration diggings that never became a mine
    5 7.8%
  3. Mines and surface workings
    labelled mines, open pits, strip mines, placer and hydraulic workings
    10 15.6%
  4. Quarries, gravel and borrow pits
    construction-material and industrial-mineral extraction
    32 50.0%
  5. Dumps, tailings, spoil and gob
    what mining left above ground
    2 3.1%
  6. Mills, tipples and facilities
    processing plants and hazardous structures
    1 1.6%
  7. Other reclamation problems
    highwalls, subsidence, polluted or clogged water, fires, slides and gases in OSMRE's inventory
    3 4.7%
Named features on the maps3 named · from the USGS compilation
Name on map Feature
Benbow Mine Adit
Mouat Mine Mine
Tandy Coal 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 problems7 on inventory
Problem area Problem Status
Benbow Millsite P2 Clogged Stream Lands Reclamation Pending
Benbow Millsite P2 Clogged Streams Reclamation Pending
Benbow Millsite P2 Industrial/Residential Waste Reclamation Pending
Miller P2 Portals Reclamation Completed
Mouat Mine P2 Dangerous Piles & Embankments Reclamation Pending
Mouat Mine P2 Hazardous Equip & Facilities Reclamation Pending
Mouat Mine P2 Portals Reclamation Pending

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 Abandoned14 on register
  1. Cedar Rapids Crusher
    Surface metal/non-metal · Gravel Works Inc · MSHA ID 2402334
    Abandoned
  2. Crusher 1
    Surface metal/non-metal · Goran LLC · MSHA ID 2402667
    Abandoned
  3. Fishtail Creek Mine
    Underground metal/non-metal · Herb Russell-Contractor · MSHA ID 2401433
    Abandoned
  4. Karl Gaustad
    Surface metal/non-metal · Karl Gaustad · MSHA ID 2402435
    Abandoned
  5. KEM Gravel Pit
    Surface metal/non-metal · KEM Ready Mix Inc · MSHA ID 2402062
    Abandoned
  6. Mountain View Mine
    Underground metal/non-metal · Chrome Corp Of America · MSHA ID 2401882
    Abandoned
  7. Mountain View Mine
    Underground metal/non-metal · Chrome Corp Of America · MSHA ID 2401883
    Abandoned
  8. Nye Basin Adit
    Underground metal/non-metal · C M Inc · MSHA ID 2401497
    Abandoned
  9. Park City Pit
    Surface metal/non-metal · Adams Brothers Construction · MSHA ID 2401280
    Abandoned
  10. Richardson Sand & Gravel Pit
    Surface metal/non-metal · Richardson Sand & Gravel Company Inc · MSHA ID 2401226
    Abandoned
  11. RIVERSIDE GRAVEL
    Surface metal/non-metal · Riverside Gravel · MSHA ID 2401982
    Abandoned
  12. Stillwater County Road Department
    Surface metal/non-metal · Stillwater County · MSHA ID 2401504
    Abandoned
  13. Stillwater Mine Company
    Surface metal/non-metal · The Robbins Company · MSHA ID 2402619
    Abandoned
  14. VORNES PORTABLE CRUSHER
    Surface metal/non-metal · Vorhes Excavation · MSHA ID 2402170
    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 30
Adit 8
Prospect Pit 5
Open Pit Mine or Quarry 3
Strip Mine 3
Quarry 2
P2 Portals 2
Mine Shaft 1
P2 Clogged Stream Lands 1
P2 Clogged Streams 1
Open Pit Mine 1
P2 Industrial/Residential Waste 1
P2 Dangerous Piles & Embankments 1
Coal Mine 1
P2 Hazardous Equip & Facilities 1
Mine 1
Disturbed Surface 1
Tailings - Pond 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.