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MSHA mine register by county

Mines in Boulder County, Colorado

Boulder County, Colorado has 88 mines on MSHA's register: 1 active, 2 intermittent, 82 abandoned. 417 accidents have been reported at these mines between 1983 and 2026. Inspectors have issued 1,750 citations.

Every mine MSHA has registered in Boulder County, working or not, with the accident, fatality and citation record each one carries on this site. Active mines are listed first, then the rest by the weight of their record.

Abandoned and historical mine features in Boulder County →

Mines on register
88
Active
1
Fatalities on record
0
Citations issued
1,750
30 underground · 48 surface · 10 facilities 0 coal · 88 metal and non-metal 2 intermittent 82 abandoned 417 reported accidents, 1983–2026
Local economic context
ⓘ County figures come from the US Census Bureau's American Community Survey, 5-year pooled estimates, so the 2023 vintage covers 2019 through 2023. The Census category is 'mining, quarrying, and oil and gas extraction', which is broader than MSHA jurisdiction and includes oil and gas workers no mine employs. These figures describe the surrounding county, not this mine, and are not a factor in any specific incident.
Boulder County, Colorado · Population 328,317
0.3%
Mining share of county employment
$102,772
Median household income
Source: US Census Bureau, American Community Survey 2023 5-year estimates.
On the map 
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MSHA-registered mine, any status

Mines plot only where MSHA holds a surveyed coordinate for the site; mines the agency locates to a town, county or state centroid are in the counts and the list above but not drawn. Click a point for the mine's status and record.

Operators with the most mines herecurrent operator of record
Operator Mines Active Fatalities
Golden Gravel Company 6 0 0
Boulder County Road Maintenance 4 0 0
Flatiron Sand & Gravel Company 4 0 0
Colorado Consolidated Metals Corp 3 0 0
Gold Hill Minerals Inc. 3 0 0
Aggregate Industries WCR, Inc. 2 0 0
C & M Sand & Gravel 2 0 0
CEMEX Construction Materials South, LLC 2 1 0
Colorado Brick Company 2 0 0
Flatiron Paving Company 2 0 0
Mines in Boulder County88 on register
  1. Lyons Cement Plant Cemex Inc
    Facility metal/non-metal · CEMEX Construction Materials South, LLC · MSHA ID 0500344
    Active
  2. LYONS QUARRY
    Surface metal/non-metal · Aggregate Industries WCR Inc · MSHA ID 0501437
    Abandoned
  3. Marlatt Pit
    Surface metal/non-metal · Golden Gravel Company · MSHA ID 0502657
    Abandoned
  4. Consolidated Caribou District
    Underground metal/non-metal · Grand Island Resources, LLC · MSHA ID 0502730
    NonProducing
  5. Cash Mine
    Underground metal/non-metal · Mount Royale Ventures, LLC · MSHA ID 0503884
    Abandoned
  6. Goose Haven Pit
    Surface metal/non-metal · Rock Products of Colorado, LLC · MSHA ID 0504828
    Abandoned
  7. HYGIENE
    Surface metal/non-metal · Golden Gravel Company · MSHA ID 0504453
    Abandoned
  8. Longmont West Mine
    Surface metal/non-metal · Aggregate Industries WCR, Inc. · MSHA ID 0504660
    Abandoned
  9. DEEPE FARM PIT
    Surface metal/non-metal · Western Mobile Boulder Inc · MSHA ID 0503532
    Abandoned
  10. Zweck Pit
    Surface metal/non-metal · C & M Sand & Gravel · MSHA ID 0504375
    Abandoned
  11. BEECH HILL QUARRY
    Surface metal/non-metal · Loukonen Brothers Stone · MSHA ID 0500053
    Intermittent
  12. BOULDER COUNTY PORTABLE
    Surface metal/non-metal · Boulder County Road Maintenance · MSHA ID 0502844
    Abandoned
  13. Erie Pit
    Surface metal/non-metal · C & M Sand & Gravel · MSHA ID 0502552
    Abandoned
  14. Hygiene Mine
    Surface metal/non-metal · Golden Gravel Company · MSHA ID 0502650
    Abandoned
  15. NOLAND QUARRY
    Surface metal/non-metal · Blue Mountain Stone Inc · MSHA ID 0504195
    Intermittent
  16. Good Friday Mine
    Underground metal/non-metal · Metal Enterprises Inc · MSHA ID 0502720
    Abandoned
  17. BOONE QUARRY
    Surface metal/non-metal · Randy Perdue Trucking & Flagstone Sales · MSHA ID 0504720
    Abandoned
  18. TBS 2
    Surface metal/non-metal · T Bone Stone · MSHA ID 0504857
    Abandoned
  19. BARNARD QUARRY
    Surface metal/non-metal · O and A Stone · MSHA ID 0504601
    Abandoned
  20. Bueno Mine
    Underground metal/non-metal · Gold Hill Minerals Inc · MSHA ID 0502402
    Abandoned
  21. Cross Mine
    Underground metal/non-metal · Grand Island Resources, LLC · MSHA ID 0502430
    NonProducing
  22. Goose Haven Sand & Gravel
    Surface metal/non-metal · Goose Haven Sand & Gravel Inc · MSHA ID 0504070
    Abandoned
  23. Caribou Mine
    Underground metal/non-metal · Nederland Mines Inc · MSHA ID 0503599
    Abandoned
  24. MOGUL MINE
    Underground metal/non-metal · Gems & Minerals Corp · MSHA ID 0504508
    Abandoned
  25. Bad Boy Stone
    Surface metal/non-metal · Eagle Stone Company · MSHA ID 0504605
    Abandoned
  26. M. Vasquez Quarry
    Surface metal/non-metal · O & A Stone Company · MSHA ID 0504729
    Abandoned
  27. Ignacio Vasquez Sr
    Surface metal/non-metal · Noland Stone · MSHA ID 0504721
    Abandoned
  28. SANDSTONE QUARRY
    Surface metal/non-metal · Cemex Construction Materials South LLC · MSHA ID 0500862
    Abandoned
  29. Valmont Pit
    Surface metal/non-metal · Flatiron Sand & Gravel Company · MSHA ID 0503251
    Abandoned
  30. Western Stone Yard
    Facility metal/non-metal · Western Stone Company · MSHA ID 0500059
    Abandoned
  31. Irwin Thomas
    Surface metal/non-metal · Northern Colorado Constructors · MSHA ID 0505167
    Abandoned
  32. Black Rose
    Underground metal/non-metal · Gold Hill Minerals Inc · MSHA ID 0503460
    Abandoned
  33. BOONE QUARRY
    Surface metal/non-metal · Rocky Mountain Stone Company · MSHA ID 0504694
    Abandoned
  34. Bueno Mill
    Facility metal/non-metal · Gold Hill Minerals Inc. · MSHA ID 0504253
    Abandoned
  35. Lucio Vasquez Quarry 1
    Surface metal/non-metal · Noland Stone · MSHA ID 0504502
    Abandoned
  36. Araphoe Pit
    Surface metal/non-metal · Flatiron Sand & Gravel Company · MSHA ID 0501898
    Abandoned
  37. Aurum
    Underground metal/non-metal · Aurum Enterprises Inc · MSHA ID 0503634
    Abandoned
  38. Badger a Group of Mines
    Underground metal/non-metal · K&B Mining LLC · MSHA ID 0505027
    Abandoned
  39. Barnard Quarry
    Surface metal/non-metal · Parsons home and property llc dba Rocc materials · MSHA ID 0505207
    New Mine
  40. Big Five Tunnel
    Underground metal/non-metal · Colorado Consolidated Metals Corp · MSHA ID 0503829
    Abandoned
  41. Boulder Milling Incorporated
    Facility metal/non-metal · Boulder Milling Inc · MSHA ID 0501865
    Abandoned
  42. Boulder Valley Farms
    Surface metal/non-metal · Flatiron Paving Company · MSHA ID 0503253
    Abandoned
  43. California Shaft
    Underground metal/non-metal · Colorado Consolidated Metals Corp · MSHA ID 0503830
    Abandoned
  44. Captain Jack Mill
    Surface metal/non-metal · Cr-Vcm Joint Venture · MSHA ID 0500540
    Abandoned
  45. Columbine
    Underground metal/non-metal · Jamestown Mining Company · MSHA ID 0503596
    Abandoned
  46. Com Inc
    Facility metal/non-metal · Com Inc · MSHA ID 0504445
    Abandoned
  47. Comstock
    Underground metal/non-metal · Aquarius Mining Company · MSHA ID 0501580
    Abandoned
  48. Dew Drop Tunnel
    Underground metal/non-metal · Colorado Consolidated Metals Corp · MSHA ID 0503828
    Abandoned
  49. Dickens
    Surface metal/non-metal · Golden Gravel Company · MSHA ID 0504182
    Abandoned
  50. Dist No 2 Gravel Pit
    Surface metal/non-metal · Boulder County Road Maintenance · MSHA ID 0503147
    Abandoned
  51. Erie Pit
    Surface metal/non-metal · Bailey Concrete Products · MSHA ID 0502546
    Abandoned
  52. Eureka Mine
    Underground metal/non-metal · Arrowhead Mining Company Inc · MSHA ID 0503072
    Abandoned
  53. Fortune-Senator Hill Mine
    Underground metal/non-metal · Keifer Mining Company · MSHA ID 0503881
    Abandoned
  54. Gold Hill mill
    Facility metal/non-metal · Colorado Milling Company, LLC · MSHA ID 0505034
    Abandoned
  55. Golden Age
    Underground metal/non-metal · Golden Age Resources Inc · MSHA ID 0503882
    Abandoned
  56. Golden Bells
    Underground metal/non-metal · Rio Corp · MSHA ID 0503849
    Abandoned
  57. Goosehaven Ii
    Surface metal/non-metal · Frontier Materials · MSHA ID 0504094
    Abandoned
  58. Grand Central
    Underground metal/non-metal · Fatima Resources Inc · MSHA ID 0503887
    Abandoned
  59. Hopewell & Rusty Horseshoe Lode
    Underground metal/non-metal · Hopewell Mining Company · MSHA ID 0502872
    Abandoned
  60. Hygiene Pit
    Surface metal/non-metal · Western Mobile Inc · MSHA ID 0502648
    Abandoned
  61. Jenkins Pit
    Surface metal/non-metal · Frontier Materials · MSHA ID 0504180
    Abandoned
  62. Keystone Mine
    Underground metal/non-metal · Keystone Mining & Milling Inc · MSHA ID 0503896
    Abandoned
  63. Longmont Pit
    Surface metal/non-metal · Golden Gravel Company · MSHA ID 0500982
    Abandoned
  64. Longmont Plant
    Facility metal/non-metal · Colorado Brick Company · MSHA ID 0500192
    Abandoned
  65. Loukonen Stone Yard
    Surface metal/non-metal · Loukonen Brothers Stone · MSHA ID 0504193
    Abandoned
  66. Marion Mill
    Facility metal/non-metal · Sweeney Mining & Milling Corp · MSHA ID 0501831
    Abandoned
  67. Mccann Clay Mine
    Surface metal/non-metal · Wesley D Conda Inc · MSHA ID 0501435
    Abandoned
  68. Nancy Haul Tunnel
    Underground metal/non-metal · The Venture · MSHA ID 0503986
    Abandoned
  69. Noland Quarries
    Surface metal/non-metal · Rocky Mountain Rock · MSHA ID 0504242
    Abandoned
  70. Portable #1
    Surface metal/non-metal · Golden Gravel Company · MSHA ID 0504112
    Abandoned
  71. Ramey Mine
    Underground metal/non-metal · Resources International Corp · MSHA ID 0503461
    Abandoned
  72. Rife Mine
    Underground metal/non-metal · Jamestown Mining Company · MSHA ID 0503462
    Abandoned
  73. Road District #1
    Surface metal/non-metal · Boulder County Road Maintenance · MSHA ID 0503146
    Abandoned
  74. Road District #3-Cold Springs
    Surface metal/non-metal · Boulder County Road Maintenance · MSHA ID 0504097
    Abandoned
  75. Rock Pit
    Surface metal/non-metal · Wesley D Conda Inc · MSHA ID 0501457
    Abandoned
  76. Sandy Miller Pit
    Surface metal/non-metal · Western Mobile Inc · MSHA ID 0504419
    Abandoned
  77. South Boone Quarry
    Surface metal/non-metal · Rough Edges, Inc. · MSHA ID 0504755
    Abandoned
  78. Spruce Gulch Mine
    Underground metal/non-metal · Alpha Minerals Inc · MSHA ID 0503928
    Abandoned
  79. Stump Mine
    Underground metal/non-metal · Wayne Williams · MSHA ID 0502230
    Abandoned
  80. Teets-Stelter
    Surface metal/non-metal · Flatiron Sand & Gravel Company · MSHA ID 0503252
    Abandoned
  81. Tungsten
    Underground metal/non-metal · Erma Shepherd & Harold Stockton · MSHA ID 0503524
    Abandoned
  82. Turnpike Pit
    Surface metal/non-metal · Flatiron Sand & Gravel Company · MSHA ID 0500975
    Abandoned
  83. Valley Stone Company
    Surface metal/non-metal · Valley Stone Company · MSHA ID 0504369
    Abandoned
  84. Valmont Plant
    Facility metal/non-metal · Colorado Brick Company · MSHA ID 0500190
    Abandoned
  85. Western Stone Company
    Facility metal/non-metal · Western Stone Company · MSHA ID 0504212
    Abandoned
  86. White Rocks
    Surface metal/non-metal · Flatiron Paving Company · MSHA ID 0502672
    Abandoned
  87. Wood Mountain Group
    Underground metal/non-metal · Kraft Building Contractors · MSHA ID 0503752
    Abandoned
  88. Yellow Pine
    Underground metal/non-metal · Yellow Pine Developement Company · MSHA ID 0503703
    Abandoned

Status, type and operator are as reported to MSHA. Fatality and accident counts are MSHA's reportable accident records for the mine; citations are inspector-issued violations on record. Each mine's own page carries the full detail.

Other counties in ColoradoAll counties →
How to read these numbers

The register is MSHA's Mine Data Retrieval System: every operation ever assigned a mine ID, including ones abandoned decades ago, so the count is a history of mining in the county, not a count of working mines. A mine's county is the one its operator reported to MSHA. Fatality and accident counts start with MSHA's reportable-accident records (1983 onward); citation counts are inspector-issued violations on record. We are an independent research tool, not MSHA.