Abandoned mine inventory
Abandoned mines in Boulder County, Colorado
Boulder County, Colorado has 1,083 mine and prospect features on USGS topographic maps published 1902–1994, including 529 mine openings (shafts, adits and air shafts) and 303 prospect pits; 143 of the features carry a name on the map. OSMRE's abandoned mine land inventory lists 147 problems in the county, 65 of them not yet reclaimed. MSHA's register carries 82 mines in the county with status Abandoned or Abandoned and Sealed.
Every mine and prospect feature the USGS digitized from historical topographic maps covering Boulder 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)
- 1,083
- Mine openings
- 529
- OSMRE problems unreclaimed
- 65
- MSHA mines marked abandoned
- 82
143 features carry a name303 prospect pits21 quadrangle maps, published 1902–1994
147 OSMRE problems, 82 reclaimed
0 MSHA mines abandoned and sealed
What the features are
-
625 50.8%Mine openingsshafts, adits, air shafts, portals and vertical openings: the ways into underground workings
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303 24.6%Prospect pits and trenchesshallow exploration diggings that never became a mine
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59 4.8%Mines and surface workingslabelled mines, open pits, strip mines, placer and hydraulic workings
-
135 11.0%Quarries, gravel and borrow pitsconstruction-material and industrial-mineral extraction
-
78 6.3%Dumps, tailings, spoil and gobwhat mining left above ground
-
30 2.4%Other reclamation problemshighwalls, subsidence, polluted or clogged water, fires, slides and gases in OSMRE's inventory
Named features on the maps143 named · from the USGS compilation
| Name on map | Feature |
|---|---|
| Alamakee Mine | Adit |
| Alton Tunnel | Adit |
| American Mine | Mine |
| Argo Mine | Mine Shaft |
| Bird Nest and Village Belle Mine | Adit |
| Black Diamond Mine | Mine Dump area |
| Black Diamond Mine | Mine Shaft |
| Blackhawk Mine | Adit |
| Blackhawk Shaft | Mine Shaft |
| Bluebird Mine | Adit |
| Bluebird Mine | Open Pit Mine |
| Boulder County Mine | Mine |
| Boulder County Mine | Mine Shaft |
| Boulder County Tunnel | Adit |
| Burlington Mine | Mine Shaft |
| Burlington Mine | Open Pit Mine area |
| Caribou Shaft | Mine Shaft |
| Cash Mine | Mine |
| Catastrophe Mine | Adit |
| Centennial Mine | Open Pit Mine |
| Clark Tunnel | Adit |
| Clyde Shaft | Mine Shaft |
| Clyde Tunnel | Adit |
| Cold Spring Mine | Mine |
| Conger Mine | Mine Shaft |
| Conger Mine | Open Pit Mine |
| Copeland Mine | Mine Shaft |
| Corning Tunnel | Adit |
| Cracker Jack Mine | Mine Dump area |
| Cracker Jack Mine | Mine Dump area |
| Cracker Jack Mine | Mine Shaft |
| Cracker Jack No 2 Mine | Adit |
| Crown Mine | Mine |
| Crown Mine | Mine Shaft |
| Crown Mine | Open Pit Mine area |
| Desperandum Mine | Adit |
| Dorothy Mine | Mine |
| E St Louis Mine | Mine Shaft |
| Eagle Bird Mine | Mine Shaft |
| Eldorado Mine | Mine Shaft |
| Elsie Mine | Adit |
| Emancipation Mine | Mine |
| Emmit Mine | Mine Shaft |
| Emmit Mine | Open Pit Mine area |
| Enterprise Mine | Mine Shaft |
| Eureka Mine | Adit |
| Evans Mine | Mine |
| Fourth of July Mine | Mine Shaft |
| Franklin Mine | Adit |
| Gladstone Mine | Mine |
| Gladstone Mine | Mine Dump area |
| Golden Harp Mine | Adit |
| Good Friday Mine | Mine |
| Grand Republic Mine | Adit |
| Grandview Mine | Mine |
| Grant Mine | Adit |
| Great Britain Mine | Adit |
| Great Northern Mine | Mine Shaft |
| Grey Copper Mine | Mine |
| Hayward Mine | Mine |
| Hayward Mine | Mine Dump area |
| Hayward Mine | Mine Shaft |
| Herald Mine | Mine |
| High View Mine | Adit |
| High View Mine | Mine Shaft |
| Idaho Tunnel | Adit |
| Illinois Mine | Mine Shaft |
| Illinois Mine | Open Pit Mine |
| Industrial Mine | Mine Shaft |
| Interocean Mine | Mine |
| Interocean Mine | Mine |
| Jackpot Mine | Mine Shaft |
| Katie Mine | Mine |
| Kekionga Mine | Mine Shaft |
| King Group Mine | Adit |
| Little Bonnie Mine | Open Pit Mine |
| Logan Mine | Adit |
| Lower Peewink Mine | Adit |
| Lylee Mine | Mine |
| Mammoth Mine | Mine Shaft |
| Melvina Mine | Mine |
| Milan Mine | Adit |
| Mitchell Mine | Mine Dump area |
| Mogul Tunnel | Adit |
| Nancy Mine | Adit |
| New Gorham Mine | Mine Shaft |
| New Gorham Mine | Mine Shaft |
| New Red Ash Mine | Adit |
| New Red Ash Mine | Mine Shaft |
| New York Mine | Adit |
| Old Crown Mine | Mine Shaft |
| Ophir Mine | Mine |
| Orange Blossom Mine | Mine Shaft |
| Oregon Mine | Adit |
| Pandora Mine | Mine Shaft |
| Pandora Mine | Open Pit Mine |
| Peerless Mine | Mine Shaft |
| Pennsylvania Mine | Adit |
| Pilot Mine | Mine |
| Pine Ridge Mine | Adit |
| Pine Ridge Mine | Mine Shaft |
| Pittsburg Mine | Mine Shaft |
| Pittsburg Mines | Adit |
| Pluto No 2 Mine | Mine Shaft |
| Pluto No 2 Mine | Mine Shaft |
| Poorman Mine | Adit |
| Poorman Mine | Adit |
| Premier Mine | Adit |
| Premier Mine | Mine Shaft |
| Primos Mine | Mine Shaft |
| Primos Mine | Mine Shaft |
| Princess Eulalia Mine | Mine |
| Pueblo Belle Mine | Adit |
| Quaker Mine | Mine |
| Quaker Mine | Mine |
| Quay Mine | Mine Shaft |
| Quay Mine | Open Pit Mine |
| Red Signe Mine | Adit |
| Red Signe Mine | Adit |
| Red Spruce Mine | Mine Shaft |
| Rogers Mine No 1 | Adit |
| Ross Mine | Adit |
| Ross Mine | Mine Shaft |
| Ruby Mine | Mine Shaft |
| Scotia Mine | Mine |
| Seventhirty Tunnel | Adit |
| Silver Point Mine | Mine Shaft |
| Slide Mine | Adit |
| Snowbound Mine | Mine |
| South Gorham Mine | Mine Shaft |
| St Joe Mine | Mine |
| St Louis Mine | Mine Shaft |
| Sun and Moon Mine | Adit |
| Sunshine Mine | Mine |
| Swathmore Mine | Adit |
| Tennessee Mine | Adit |
| Tungsten Shaft | Mine Shaft |
| Tynan Mine | Mine Dump area |
| Victoria Mine | Mine |
| White Crow Mine | Mine |
| Windy Tunnel | Adit |
| Wood Mine | Mine |
| Yellow Pine 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 problems147 on inventory
| Problem area | Problem | Status |
|---|---|---|
| Allen Bond/big 5/blk Dmd - 83/25-02 | P1 Surface Burning | Reclamation Completed |
| Baker/vaughn/storrs - 95/26-01 | P2 Subsidence | In Reclamation |
| Baker/vaughn/storrs - 95/26-01 | P2 Vertical Openings | In Reclamation |
| Banner/jackson Mines - 93/32-01 | P1 Vertical Openings | Reclamation Completed |
| Banner/jackson Mines - 93/32-01 | P1 Vertical Openings | Reclamation Completed |
| Banner/jackson Mines - 93/32-01 | P2 Vertical Openings | Reclamation Completed |
| Big Lake/electric Mines - 90/26-01 | P2 Vertical Openings | Reclamation Pending |
| Big Lake/electric Mines - 90/26-01 | P3 Gobs | Reclamation Pending |
| Black Diamond #2 - Not In Orig Inv | P1 Vertical Openings | Reclamation Completed |
| Black Diamond #2 - Not In Orig Inv | P3 Gobs | Reclamation Pending |
| Blue Goose/york Strip- 83/25-01 | P1 Subsidence | Reclamation Completed |
| Blue Goose/york Strip- 83/25-01 | P1 Surface Burning | In Reclamation |
| Blue Goose/york Strip- 83/25-01 | P1 Vertical Openings | Reclamation Completed |
| Boulder - Non-coal-county-wide | P1 Portals | Reclamation Completed |
| Boulder - Non-coal-county-wide | P1 Portals | In Reclamation |
| Boulder - Non-coal-county-wide | P1 Vertical Openings | Reclamation Completed |
| Boulder - Non-coal-county-wide | P1 Vertical Openings | In Reclamation |
| Boulder County - Coal - Co-wide | P2 Subsidence | Reclamation Pending |
| Boulder County - Coal - Co-wide | P3 Mine Opening | Reclamation Pending |
| Cambro/senator Mines - 93/26-02 | P2 Portals | Reclamation Pending |
| Cambro/senator Mines - 93/26-02 | P2 Vertical Openings | Reclamation Completed |
| Cannon Mine - 93/26-01 | P2 Vertical Openings | Reclamation Pending |
| Capitol Mine - 94/26-01 | P2 Vertical Openings | Reclamation Completed |
| Co - Boulder - Fea | P1 Subsidence | Reclamation Completed |
| Co - Boulder - Fea | P1 Vertical Openings | Reclamation Completed |
| Crackerjack #2 - 81/22-03 | P2 Portals | Reclamation Pending |
| Crackerjack #2 - 81/22-03 | P2 Subsidence | Reclamation Pending |
| Crackerjack #2 - 81/22-03 | P2 Vertical Openings | Reclamation Pending |
| Eldorado/black Diamond - 80/22-02 | P1 Vertical Openings | Reclamation Completed |
| Excelsior - 93/27-02 | P2 Vertical Openings | Reclamation Completed |
| Fireside Mine - 87/25-01 | P2 Portals | Reclamation Pending |
| Fireside Mine - 87/25-01 | P2 Vertical Openings | Reclamation Pending |
| Fox/davidson Ditch - 81/23-02 | P1 Vertical Openings | Reclamation Completed |
| Fox/davidson Ditch - 81/23-02 | P2 Portals | Reclamation Pending |
| Fox/davidson Ditch - 81/23-02 | P3 Gobs | Reclamation Pending |
| Garfield #1 - 95/31-03 | P2 Vertical Openings | Reclamation Completed |
| Gladstone - 93/27-01 | P2 Vertical Openings | Reclamation Completed |
| Hayward Mine - 95/27-01 | P1 Vertical Openings | Reclamation Completed |
| Hecla #1 Mine - 89/26-01 | P1 Vertical Openings | Reclamation Completed |
| Hecla #1 Mine - 89/26-01 | P3 Gobs | Reclamation Pending |
| Industrial Mine - 85/21-01 | P1 Surface Burning | Reclamation Completed |
| Industrial Mine - 85/21-01 | P1 Vertical Openings | Reclamation Completed |
| Industrial Mine - 85/21-01 | P2 Vertical Openings | Reclamation Pending |
| Leader/ajax/acme Mines - 87/23-01 | P2 Vertical Openings | In Reclamation |
| Lewis Mine Area - 81/23-03 | P2 Portals | Reclamation Pending |
| Lewis Mine Area - 81/23-03 | P2 Vertical Openings | Reclamation Pending |
| Lewis Mine Area - 81/23-03 | P3 Gobs | Reclamation Pending |
| Lewis No. 1/no. 2 - 81/22-04 | P1 Polluted Water: Human Consumption | Reclamation Completed |
| Lewis No. 1/no. 2 - 81/22-04 | P1 Subsidence | Reclamation Completed |
| Lewis No. 1/no. 2 - 81/22-04 | P1 Subsidence | Reclamation Completed |
| Lewis No. 1/no. 2 - 81/22-04 | P1 Surface Burning | Reclamation Completed |
| Lewis No. 1/no. 2 - 81/22-04 | P1 Underground Mine Fires | Reclamation Completed |
| Lewis No. 1/no. 2 - 81/22-04 | P1 Underground Mine Fires | Reclamation Pending |
| Lewis No. 1/no. 2 - 81/22-04 | P1 Vertical Openings | Reclamation Completed |
| Lewis No. 1/no. 2 - 81/22-04 | P2 Subsidence | In Reclamation |
| Lewis No. 1/no. 2 - 81/22-04 | P2 Surface Burning | Reclamation Completed |
| Lewis No. 1/no. 2 - 81/22-04 | P2 Underground Mine Fires | Reclamation Completed |
| Lewis No. 1/no. 2 - 81/22-04 | P2 Vertical Openings | In Reclamation |
| Liley - 94/24-01 | P2 Vertical Openings | Reclamation Pending |
| Liley - 94/24-01 | P3 Gobs | Reclamation Pending |
| Longs Peak Mine - 95/33-01 | P1 Subsidence | Reclamation Completed |
| Marfell/pinnacle - 95/31-01 | P2 Vertical Openings | Reclamation Completed |
| Marshall #2 - 81/22-02 | P2 Portals | Reclamation Pending |
| Marshall #2 - 81/22-02 | P2 Subsidence | Reclamation Completed |
| Marshall #2 - 81/22-02 | P2 Vertical Openings | Reclamation Completed |
| Marshall #3 - 80/22-08 | P1 Vertical Openings | Reclamation Completed |
| Marshall #3 - 80/22-08 | P2 Portals | Reclamation Pending |
| Marshall #3 - 80/22-08 | P2 Vertical Openings | Reclamation Pending |
| Marshall #5 - 80/22-07 | P2 Portals | Reclamation Completed |
| Marshall #5 - 80/22-07 | P3 Gobs | Reclamation Pending |
| Marshall #6/#7 - 80/22-03 | P2 Portals | Reclamation Pending |
| Marshall #6/#7 - 80/22-03 | P2 Vertical Openings | Reclamation Completed |
| Marshall 1/4 - 80/22-01 - Pad Msng | P1 Underground Mine Fires | Reclamation Completed |
| Marshall 1/4 - 80/22-01 - Pad Msng | P2 Subsidence | Reclamation Completed |
| Marshall 1/4 - 80/22-01 - Pad Msng | P2 Underground Mine Fires | In Reclamation |
| Matchless Mine - 86/24-01 | P2 Vertical Openings | Reclamation Pending |
| Mcgregor/cleveland - 95/31-02 | P2 Vertical Openings | In Reclamation |
| Mile High - 91/29-01 - Pad Missing | P2 Vertical Openings | Reclamation Completed |
| Mitchell - 93/28-01 | P2 Vertical Openings | Reclamation Completed |
| Monarch #1 - 83/23-01 | P2 Vertical Openings | Reclamation Completed |
| Monarch #1 - 83/23-01 | P3 Gobs | Reclamation Pending |
| New Centennial Wp - 91/24-01 | P3 Gobs | Reclamation Pending |
| New Gorham - 84/22-02 | P2 Portals | Reclamation Completed |
| New Ross/cook - 82/23-02 | P2 Portals | Reclamation Completed |
| New Ross/cook - 82/23-02 | P2 Vertical Openings | Reclamation Completed |
| New Ross/cook - 82/23-02 | P3 Gobs | Reclamation Pending |
| No. 6 Fox - 80/22-04 | P1 Portals | Reclamation Completed |
| No. 6 Fox - 80/22-04 | P1 Vertical Openings | Reclamation Completed |
| No. 6 Fox - 80/22-04 | P2 Portals | Reclamation Completed |
| No. 6 Fox - 80/22-04 | P2 Vertical Openings | In Reclamation |
| No. 6 Fox - 80/22-04 | P2 Vertical Openings | Reclamation Completed |
| Non Pareil - 89/23-01 | P2 Vertical Openings | Reclamation Completed |
| Old Centennial Mine - 89/23-01 | P2 Vertical Openings | Reclamation Completed |
| Old Centennial Mine - 89/23-01 | P3 Gobs | Reclamation Pending |
| Old Fox - 80/22-06 | P1 Portals | Reclamation Completed |
| Old Fox - 80/22-06 | P1 Vertical Openings | Reclamation Completed |
| Old Fox - 80/22-06 | P2 Subsidence | Reclamation Pending |
| Old Fox - 80/22-06 | P2 Vertical Openings | In Reclamation |
| Old Fox - 80/22-06 | P3 Gobs | Reclamation Pending |
| Old Fox Slope - 80/23-01 | P1 Portals | Reclamation Completed |
| Old Fox Slope - 80/23-01 | P2 Portals | Reclamation Completed |
| Old Fox Slope - 80/23-01 | P2 Subsidence | Reclamation Pending |
| Old Fox Slope - 80/23-01 | P2 Vertical Openings | Reclamation Completed |
| Old Imperial/caledonia - 88/25-01 | P2 Vertical Openings | Reclamation Pending |
| Old Marshall Shaft - 90/25-01 | P2 Vertical Openings | Reclamation Completed |
| Old Star/arrow Mines - 94/33-01 | P1 Subsidence | Reclamation Completed |
| Old Star/arrow Mines - 94/33-01 | P1 Vertical Openings | Reclamation Completed |
| Pittsburg/red Ash #2 - 82/23-03 | P1 Surface Burning | Reclamation Completed |
| Pittsburg/red Ash #2 - 82/23-03 | P2 Portals | Reclamation Completed |
| Pittsburg/red Ash #2 - 82/23-03 | P2 Vertical Openings | Reclamation Completed |
| Pittsburg/red Ash #2 - 82/23-03 | P3 Gobs | Reclamation Pending |
| Pluto #2 - Not In Orig Inv | P1 Subsidence | Reclamation Completed |
| Pluto #2 - Not In Orig Inv | P1 Surface Burning | Reclamation Completed |
| Pluto Mine - 84/22-01 | P1 Vertical Openings | Reclamation Completed |
| Premier - 80/21-01 | P2 Portals | Reclamation Pending |
| Premier - 80/21-01 | P2 Subsidence | Reclamation Pending |
| Premier - 80/21-01 | P3 Gobs | Reclamation Pending |
| Red Ash - 81/23-01 | P2 Portals | Reclamation Completed |
| Red Ash - 81/23-01 | P2 Vertical Openings | Reclamation Completed |
| Red Ash - 81/23-01 | P3 Gobs | Reclamation Pending |
| Regal Mine - 90/24-01 | P1 Vertical Openings | Reclamation Completed |
| Rex #1 - 88/26-01 | P1 Vertical Openings | Reclamation Completed |
| Rex #2 - 89/25-02 | P2 Vertical Openings | Reclamation Pending |
| Rosser - 80/21-02 | P1 Portals | Reclamation Completed |
| Rosser - 80/21-02 | P1 Vertical Openings | Reclamation Completed |
| Rosser - 80/21-02 | P3 Gobs | Reclamation Pending |
| Senator - 83/26-02 | P2 Portals | Reclamation Pending |
| Simpson Mine - Not In Orig Inv | P1 Vertical Openings | Reclamation Completed |
| Simpson Mine - Not In Orig Inv | P1 Vertical Openings | Reclamation Completed |
| Simpson Mine - Not In Orig Inv | P1 Vertical Openings | Reclamation Completed |
| South Gorham - 84/22-03 | P2 Portals | Reclamation Pending |
| South Gorham - 84/22-03 | P3 Gobs | Reclamation Pending |
| Standard Mine - 93/33-01 | P2 Vertical Openings | In Reclamation |
| Standard Mine - 93/33-01 | P3 Gobs | Reclamation Pending |
| Stewart Mine - 95/32-02 | P2 Vertical Openings | Reclamation Completed |
| Strathmore Mine - 92/26-01 | P2 Vertical Openings | In Reclamation |
| Sunnyside - 90/21-01 | P1 Vertical Openings | Reclamation Completed |
| Sunnyside - 90/21-01 | P3 Gobs | Reclamation Completed |
| Sunrise - 81/22-01 | P2 Vertical Openings | Reclamation Completed |
| Sunrise - 81/22-01 | P2 Vertical Openings | Reclamation Completed |
| Sunrise - 81/22-01 | P3 Gobs | Reclamation Pending |
| Tynon Mine - 94/32-01 | P2 Vertical Openings | Reclamation Completed |
| Tynon Mine - 94/32-01 | P3 Gobs | Reclamation Pending |
| Vulcan Mine - 91/25-01 | P1 Vertical Openings | Reclamation Completed |
| Vulcan Mine - 91/25-01 | P2 Vertical Openings | Reclamation Pending |
| Welch - 89/25-01 | P2 Vertical Openings | In Reclamation |
| Wilson - 87/22-01 | P2 Vertical Openings | 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 Abandoned82 on register
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Araphoe PitAbandoned 1985-07-17Surface metal/non-metal · Flatiron Sand & Gravel Company · MSHA ID 0501898
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AurumAbandoned 1985-07-03Underground metal/non-metal · Aurum Enterprises Inc · MSHA ID 0503634
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Bad Boy StoneAbandoned 2006-03-20Surface metal/non-metal · Eagle Stone Company · MSHA ID 0504605
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Badger a Group of MinesAbandoned 2019-10-01Underground metal/non-metal · K&B Mining LLC · MSHA ID 0505027
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BARNARD QUARRYAbandoned 2007-09-24Surface metal/non-metal · O and A Stone · MSHA ID 0504601
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Big Five TunnelAbandoned 1984-07-11Underground metal/non-metal · Colorado Consolidated Metals Corp · MSHA ID 0503829
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Black RoseAbandoned 2008-07-22Underground metal/non-metal · Gold Hill Minerals Inc · MSHA ID 0503460
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BOONE QUARRYAbandoned 2002-07-05Surface metal/non-metal · Rocky Mountain Stone Company · MSHA ID 0504694
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BOONE QUARRYAbandoned 2007-10-01Surface metal/non-metal · Randy Perdue Trucking & Flagstone Sales · MSHA ID 0504720
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BOULDER COUNTY PORTABLEAbandoned 1998-08-31Surface metal/non-metal · Boulder County Road Maintenance · MSHA ID 0502844
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Boulder Milling IncorporatedAbandoned 1986-01-10Facility metal/non-metal · Boulder Milling Inc · MSHA ID 0501865
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Boulder Valley FarmsAbandoned 1988-06-06Surface metal/non-metal · Flatiron Paving Company · MSHA ID 0503253
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Bueno MillAbandoned 2007-10-01Facility metal/non-metal · Gold Hill Minerals Inc. · MSHA ID 0504253
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Bueno MineAbandoned 2007-10-01Underground metal/non-metal · Gold Hill Minerals Inc · MSHA ID 0502402
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California ShaftAbandoned 1984-07-11Underground metal/non-metal · Colorado Consolidated Metals Corp · MSHA ID 0503830
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Captain Jack MillAbandoned 1989-09-07Surface metal/non-metal · Cr-Vcm Joint Venture · MSHA ID 0500540
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Caribou MineAbandoned 1986-08-12Underground metal/non-metal · Nederland Mines Inc · MSHA ID 0503599
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Cash MineAbandoned 2009-07-09Underground metal/non-metal · Mount Royale Ventures, LLC · MSHA ID 0503884
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ColumbineAbandoned 1982-05-20Underground metal/non-metal · Jamestown Mining Company · MSHA ID 0503596
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Com IncAbandoned 1996-05-04Facility metal/non-metal · Com Inc · MSHA ID 0504445
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ComstockAbandoned 1985-06-20Underground metal/non-metal · Aquarius Mining Company · MSHA ID 0501580
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DEEPE FARM PITAbandoned 1996-11-12Surface metal/non-metal · Western Mobile Boulder Inc · MSHA ID 0503532
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Dew Drop TunnelAbandoned 1984-07-11Underground metal/non-metal · Colorado Consolidated Metals Corp · MSHA ID 0503828
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DickensAbandoned 1991-09-18Surface metal/non-metal · Golden Gravel Company · MSHA ID 0504182
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Dist No 2 Gravel PitAbandoned 1978-08-16Surface metal/non-metal · Boulder County Road Maintenance · MSHA ID 0503147
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Erie PitAbandoned 1981-10-23Surface metal/non-metal · Bailey Concrete Products · MSHA ID 0502546
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Erie PitAbandoned 1990-06-05Surface metal/non-metal · C & M Sand & Gravel · MSHA ID 0502552
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Eureka MineAbandoned 1980-11-25Underground metal/non-metal · Arrowhead Mining Company Inc · MSHA ID 0503072
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Fortune-Senator Hill MineAbandoned 1985-04-23Underground metal/non-metal · Keifer Mining Company · MSHA ID 0503881
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Gold Hill millAbandoned 2018-11-21Facility metal/non-metal · Colorado Milling Company, LLC · MSHA ID 0505034
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Golden AgeAbandoned 1986-09-09Underground metal/non-metal · Golden Age Resources Inc · MSHA ID 0503882
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Golden BellsAbandoned 1994-09-22Underground metal/non-metal · Rio Corp · MSHA ID 0503849
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Good Friday MineAbandoned 1985-07-15Underground metal/non-metal · Metal Enterprises Inc · MSHA ID 0502720
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Goose Haven PitAbandoned 2024-09-04Surface metal/non-metal · Rock Products of Colorado, LLC · MSHA ID 0504828
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Goose Haven Sand & GravelAbandoned 1994-05-01Surface metal/non-metal · Goose Haven Sand & Gravel Inc · MSHA ID 0504070
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Goosehaven IiAbandoned 1990-08-21Surface metal/non-metal · Frontier Materials · MSHA ID 0504094
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Grand CentralAbandoned 1986-09-09Underground metal/non-metal · Fatima Resources Inc · MSHA ID 0503887
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Hopewell & Rusty Horseshoe LodeAbandoned 1980-02-08Underground metal/non-metal · Hopewell Mining Company · MSHA ID 0502872
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HYGIENEAbandoned 2000-01-10Surface metal/non-metal · Golden Gravel Company · MSHA ID 0504453
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Hygiene MineAbandoned 1987-06-05Surface metal/non-metal · Golden Gravel Company · MSHA ID 0502650
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Hygiene PitAbandoned 1991-06-19Surface metal/non-metal · Western Mobile Inc · MSHA ID 0502648
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Ignacio Vasquez SrAbandoned 2005-08-12Surface metal/non-metal · Noland Stone · MSHA ID 0504721
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Irwin ThomasAbandoned 2026-07-27Surface metal/non-metal · Northern Colorado Constructors · MSHA ID 0505167
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Jenkins PitAbandoned 1986-11-24Surface metal/non-metal · Frontier Materials · MSHA ID 0504180
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Keystone MineAbandoned 1985-04-23Underground metal/non-metal · Keystone Mining & Milling Inc · MSHA ID 0503896
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Longmont PitAbandoned 1988-08-01Surface metal/non-metal · Golden Gravel Company · MSHA ID 0500982
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Longmont PlantAbandoned 1982-05-21Facility metal/non-metal · Colorado Brick Company · MSHA ID 0500192
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Longmont West MineAbandoned 2006-01-17Surface metal/non-metal · Aggregate Industries WCR, Inc. · MSHA ID 0504660
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Loukonen Stone YardAbandoned 1989-08-21Surface metal/non-metal · Loukonen Brothers Stone · MSHA ID 0504193
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Lucio Vasquez Quarry 1Abandoned 2006-05-05Surface metal/non-metal · Noland Stone · MSHA ID 0504502
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LYONS QUARRYAbandoned 2007-06-25Surface metal/non-metal · Aggregate Industries WCR Inc · MSHA ID 0501437
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M. Vasquez QuarryAbandoned 2010-10-01Surface metal/non-metal · O & A Stone Company · MSHA ID 0504729
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Marion MillAbandoned 1992-07-09Facility metal/non-metal · Sweeney Mining & Milling Corp · MSHA ID 0501831
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Marlatt PitAbandoned 1994-06-24Surface metal/non-metal · Golden Gravel Company · MSHA ID 0502657
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Mccann Clay MineAbandoned 1986-06-17Surface metal/non-metal · Wesley D Conda Inc · MSHA ID 0501435
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MOGUL MINEAbandoned 1997-12-16Underground metal/non-metal · Gems & Minerals Corp · MSHA ID 0504508
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Nancy Haul TunnelAbandoned 1985-07-03Underground metal/non-metal · The Venture · MSHA ID 0503986
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Noland QuarriesAbandoned 1988-10-31Surface metal/non-metal · Rocky Mountain Rock · MSHA ID 0504242
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Portable #1Abandoned 1987-04-10Surface metal/non-metal · Golden Gravel Company · MSHA ID 0504112
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Ramey MineAbandoned 1983-01-14Underground metal/non-metal · Resources International Corp · MSHA ID 0503461
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Rife MineAbandoned 1983-11-07Underground metal/non-metal · Jamestown Mining Company · MSHA ID 0503462
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Road District #1Abandoned 1988-08-11Surface metal/non-metal · Boulder County Road Maintenance · MSHA ID 0503146
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Road District #3-Cold SpringsAbandoned 1988-06-20Surface metal/non-metal · Boulder County Road Maintenance · MSHA ID 0504097
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Rock PitAbandoned 1992-03-03Surface metal/non-metal · Wesley D Conda Inc · MSHA ID 0501457
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SANDSTONE QUARRYAbandoned 2010-07-08Surface metal/non-metal · Cemex Construction Materials South LLC · MSHA ID 0500862
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Sandy Miller PitAbandoned 1991-06-30Surface metal/non-metal · Western Mobile Inc · MSHA ID 0504419
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South Boone QuarryAbandoned 2003-11-13Surface metal/non-metal · Rough Edges, Inc. · MSHA ID 0504755
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Spruce Gulch MineAbandoned 1986-09-22Underground metal/non-metal · Alpha Minerals Inc · MSHA ID 0503928
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Stump MineAbandoned 1981-05-04Underground metal/non-metal · Wayne Williams · MSHA ID 0502230
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TBS 2Abandoned 2023-03-28Surface metal/non-metal · T Bone Stone · MSHA ID 0504857
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Teets-StelterAbandoned 1981-06-17Surface metal/non-metal · Flatiron Sand & Gravel Company · MSHA ID 0503252
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TungstenAbandoned 1981-10-20Underground metal/non-metal · Erma Shepherd & Harold Stockton · MSHA ID 0503524
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Turnpike PitAbandoned 1982-09-27Surface metal/non-metal · Flatiron Sand & Gravel Company · MSHA ID 0500975
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Valley Stone CompanyAbandoned 1993-08-27Surface metal/non-metal · Valley Stone Company · MSHA ID 0504369
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Valmont PitAbandoned 1987-03-03Surface metal/non-metal · Flatiron Sand & Gravel Company · MSHA ID 0503251
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Valmont PlantAbandoned 1982-05-21Facility metal/non-metal · Colorado Brick Company · MSHA ID 0500190
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Western Stone CompanyAbandoned 1987-05-15Facility metal/non-metal · Western Stone Company · MSHA ID 0504212
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Western Stone YardAbandoned 1995-08-11Facility metal/non-metal · Western Stone Company · MSHA ID 0500059
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White RocksAbandoned 1984-07-03Surface metal/non-metal · Flatiron Paving Company · MSHA ID 0502672
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Wood Mountain GroupAbandoned 1985-07-05Underground metal/non-metal · Kraft Building Contractors · MSHA ID 0503752
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Yellow PineAbandoned 1982-06-02Underground metal/non-metal · Yellow Pine Developement Company · MSHA ID 0503703
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Zweck PitAbandoned 1991-09-25Surface metal/non-metal · C & M Sand & Gravel · MSHA ID 0504375
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 |
|---|---|
| Prospect Pit | 303 |
| Adit | 283 |
| Mine Shaft | 246 |
| Mine Dump | 50 |
| P2 Vertical Openings | 46 |
| Quarry | 40 |
| Gravel Pit | 38 |
| Mine | 31 |
| P1 Vertical Openings | 26 |
| Quarry | 25 |
| P3 Gobs | 21 |
| P2 Portals | 18 |
| Gravel Pit | 18 |
| Disturbed Surface | 15 |
| P2 Subsidence | 9 |
| Open Pit Mine | 7 |
| P1 Subsidence | 7 |
| Clay Pit | 6 |
| P1 Portals | 6 |
| P1 Surface Burning | 6 |
| Tailings - Pond | 5 |
| Gravel/Borrow Pit - Undifferentiated | 4 |
| P1 Underground Mine Fires | 3 |
| Open Pit Mine or Quarry | 3 |
| Open Pit Mine | 3 |
| Clay Pit | 3 |
| P2 Underground Mine Fires | 2 |
| Tailings - Undifferentiated | 2 |
| P1 Polluted Water: Human Consumption | 1 |
| Borrow Pit | 1 |
| P2 Surface Burning | 1 |
| P3 Mine Opening | 1 |
Other counties in ColoradoAll 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
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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.
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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.
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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.
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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.
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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.
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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.
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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).
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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.