Abandoned mines in Mineral County, Colorado

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   170 35.2%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   274 56.7%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   7 1.4%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   13 2.7%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   18 3.7%
6. Other reclamation problems

   highwalls, subsidence, polluted or clogged water, fires, slides and gases in OSMRE's inventory
   1 0.2%

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. Alpha Cosair (Cowboy Johnson)

   Underground metal/non-metal · Minerals Engineering Company · MSHA ID 0503307
   Abandoned 1986-09-24
2. Collerette

   Surface metal/non-metal · Colorado Department Of Highways · MSHA ID 0503404
   Abandoned 1979-10-09
3. Creede Mill

   Facility metal/non-metal · Minerals Engineering Company · MSHA ID 0502557
   Abandoned 1988-08-04
4. Creede Venture

   Underground metal/non-metal · Minerals Engineering Company · MSHA ID 0502905
   Abandoned 1986-03-31
5. Emperius

   Underground metal/non-metal · Mesa Operating Limited Partnership · MSHA ID 0500412
   Abandoned 1987-07-23
6. Equity Mine

   Underground metal/non-metal · Rio Grande Silver, Inc. · MSHA ID 0504191
   Abandoned 2014-10-01
7. Jim Tree Mine

   Surface metal/non-metal · Jim Tree Mining Co · MSHA ID 0502904
   Abandoned 1979-07-26
8. King Solomon

   Underground metal/non-metal · Minerals Engineering Company · MSHA ID 0503308
   Abandoned 1979-12-03
9. Power Screen

   Surface metal/non-metal · Foutz & Bursum Construction Company Inc · MSHA ID 0504411
   Abandoned 1991-05-20
10. Resurrection Tunnel

    Underground metal/non-metal · Todilto Exploration & Development Corp · MSHA ID 0503770
    Abandoned 1985-09-04
11. Unit #1 Pagosa Sand & Gravel

    Surface metal/non-metal · Pagosa Sand & Gravel · MSHA ID 0504170
    Abandoned 1990-09-17
12. Wasson Quarry

    Surface metal/non-metal · Colorado Lien Company · MSHA ID 0503224
    Abandoned 1985-05-02

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

• San Juan County 3,913
• Lake County 3,672
• Gunnison County 2,703
• Saguache County 2,319
• San Miguel County 2,242
• Gilpin County 2,148
• Montrose County 2,077
• Custer County 2,062
• Clear Creek County 1,996
• Park County 1,624
• Chaffee County 1,486
• Summit County 1,449

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.