Abandoned mines in Platte County, Wyoming

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   42 28.0%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   9 6.0%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   14 9.3%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   70 46.7%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   6 4.0%
6. Mills, tipples and facilities

   processing plants and hazardous structures
   1 0.7%
7. Other reclamation problems

   highwalls, subsidence, polluted or clogged water, fires, slides and gases in OSMRE's inventory
   6 4.0%
8. Other

   symbols outside the classes above
   2 1.3%

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. A R Fertig Pit

   Surface metal/non-metal · A R Fertig Ready Mix Company · MSHA ID 4801026
   Abandoned 1979-10-02
2. Basin Pit No 1

   Surface metal/non-metal · Gilpatrick Construction Company Inc · MSHA ID 4801266
   Abandoned 1980-10-17
3. Chicago Pit

   Surface metal/non-metal · C F & I Steel Corp · MSHA ID 4800999
   Abandoned 1981-08-04
4. Crusher #1

   Surface metal/non-metal · RGB Construction · MSHA ID 4801786
   Abandoned 2015-07-01
5. Gray Quarry

   Surface metal/non-metal · Emulsified Asphalt Inc Of Wyoming · MSHA ID 4801397
   Abandoned 1985-05-28
6. HARTVILLE (INGELSIDE)

   Surface metal/non-metal · Pete Lien & Sons Inc · MSHA ID 4801586
   Abandoned 2025-03-10
7. Imerys Marble Incorporated

   Surface metal/non-metal · Imerys Marble Inc · MSHA ID 4800026
   Abandoned 2005-03-22
8. Imerys Marble Incorporated

   Facility metal/non-metal · Imerys Marble Inc · MSHA ID 4800533
   Abandoned 2005-03-22
9. Lidstrom Pit #1

   Surface metal/non-metal · Lidstrom Inc · MSHA ID 4801143
   Abandoned 1989-04-17
10. May Pit

    Surface metal/non-metal · Gilpatrick Construction Company Inc · MSHA ID 4801238
    Abandoned 1980-10-17
11. Owen'S Pit

    Surface metal/non-metal · Teton Construction Company · MSHA ID 4801155
    Abandoned 1979-11-15
12. Platte County Pit

    Surface metal/non-metal · Platte County Highway Department · MSHA ID 4801108
    Abandoned 1980-03-19
13. RAVEN 196

    Surface metal/non-metal · Raven Quarries Llc · MSHA ID 4801523
    Abandoned 2003-05-28
14. Roncco

    Underground coal · Becor · MSHA ID 4800078
    Abandoned and Sealed 1982-03-08
15. Sunrise Mine And Mill

    Underground metal/non-metal · C F & I Steel Corp · MSHA ID 4800144
    Abandoned 1983-03-02

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

• Fremont County 2,398
• Crook County 919
• Carbon County 713
• Sweetwater County 691
• Albany County 428
• Big Horn County 427
• Johnson County 254
• Natrona County 231
• Lincoln County 212
• Converse County 198
• Park County 179
• Campbell County 179

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.