Abandoned mines in Weston County, Wyoming

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   11 6.9%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   6 3.8%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   5 3.1%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   95 59.4%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   14 8.8%
6. Mills, tipples and facilities

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

   highwalls, subsidence, polluted or clogged water, fires, slides and gases in OSMRE's inventory
   28 17.5%

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. Banks Silver Creek Pit

   Surface metal/non-metal · Gilpatrick Construction Company Inc · MSHA ID 4801234
   Abandoned 1980-10-17
2. Dry Fork Pit #2

   Surface metal/non-metal · LoneHart, LLC · MSHA ID 4801713
   Abandoned 2013-11-18
3. Fawcet Pit No 2

   Surface metal/non-metal · Kenneth Thompson · MSHA ID 4801089
   Abandoned 1983-07-12
4. Government Quarry No 1

   Surface metal/non-metal · Lamb Construction Company · MSHA ID 4801041
   Abandoned 1979-01-12
5. Grieves Pit

   Surface metal/non-metal · Weston County Highway Department · MSHA ID 4801153
   Abandoned 1979-01-18
6. Mill Fall Run Mine #1

   Underground coal · LID Not Available · MSHA ID 4808480
   Abandoned 1995-04-05
7. Newcastle Quarry

   Surface metal/non-metal · Summit Materials Inc · MSHA ID 4801321
   Abandoned 1989-01-03
8. Old Gold Mine

   Surface metal/non-metal · American Colloid Company Minerals Group · MSHA ID 4801101
   Abandoned 1978-04-03
9. Osage Field Project

   Underground metal/non-metal · Rock Well Petroleum (U.S.), Inc · MSHA ID 4801706
   Abandoned 2010-03-03
10. Osage Mine

    Surface metal/non-metal · Federal Bentonite Div/Aurora Metal Company · MSHA ID 4800619
    Abandoned 1978-06-06
11. Roby Pit

    Surface metal/non-metal · Gilpatrick Construction Company Inc · MSHA ID 4801233
    Abandoned 1980-10-17
12. Screen Number 1

    Surface metal/non-metal · Dan Hart Patrol Service LLC · MSHA ID 4801652
    Abandoned 2015-01-09
13. Screen Number 2

    Surface metal/non-metal · Dan Hart Patrol Service LLC · MSHA ID 4801684
    Abandoned 2020-04-21
14. UPTON MILL & MINE

    Surface metal/non-metal · American Colloid Company Minerals Group · MSHA ID 4800059
    Abandoned 2003-01-09
15. Upton Mine

    Surface metal/non-metal · American Colloid Company Minerals Group · MSHA ID 4800807
    Abandoned 1992-07-10
16. Vondriska Quarry

    Surface metal/non-metal · R J Studer & Sons · MSHA ID 4801299
    Abandoned 1980-08-01
17. Weston County Mine

    Surface metal/non-metal · Weston County Roads & Bridges Department · MSHA ID 4801313
    Abandoned 1982-08-17

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.