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MSHA mine register by county

Mines in Crook County, Wyoming

Crook County, Wyoming has 48 mines on MSHA's register: 6 active, 3 intermittent, 35 abandoned. 1 miner has died and 546 accidents have been reported at these mines between 1983 and 2026. Inspectors have issued 1,434 citations.

Every mine MSHA has registered in Crook 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 Crook County →

Mines on register
48
Active
6
Fatalities on record
1
Citations issued
1,434
2 underground · 43 surface · 3 facilities 0 coal · 48 metal and non-metal 3 intermittent 35 abandoned 546 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.
Crook County, Wyoming · Population 7,339
7.1%
Mining share of county employment
$71,209
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
Quality Agg & Construction, Inc 5 0 0
American Colloid Company Minerals Group 4 3 0
Basic Energy Services, L.P. 3 0 0
N A Corp 3 0 0
Ramsey Hill Exploration LLC 3 1 0
Bentonite Performance Minerals, LLC 2 2 0
Croell, Inc. 2 0 0
Delzer Construction Company Inc 2 0 0
Earth Work Solutions (WY) 2 0 0
Federal Bentonite Div/Aurora Metal Company 2 0 0
Mines in Crook County48 on register
  1. BPM Colony Mill
    Facility metal/non-metal · Bentonite Performance Minerals, LLC · MSHA ID 4800070
    Active
  2. COLONY WEST MILL
    Facility metal/non-metal · American Colloid Company · MSHA ID 4800245
    Active
  3. Belle/Colony Mine
    Surface metal/non-metal · American Colloid Company · MSHA ID 4800888
    Active
  4. COLONY EAST MILL
    Facility metal/non-metal · American Colloid Company · MSHA ID 4800594
    Active
  5. BPM Colony Mine
    Surface metal/non-metal · Bentonite Performance Minerals LLC · MSHA ID 4800889
    Active
  6. Moorcroft Mine
    Surface metal/non-metal · Ramsey Hill Exploration L.L.C. · MSHA ID 4801905
    Active
  7. Sundance Quarry
    Surface metal/non-metal · Summit Materials Inc · MSHA ID 4800011
    Abandoned
  8. Crusher 2
    Surface metal/non-metal · Croell, Inc. · MSHA ID 4801698
    Temporarily Idled
  9. Hunter Quarry
    Surface metal/non-metal · Pete Lien & Sons Inc · MSHA ID 4801705
    Abandoned
  10. VONDRISKA PIT, SUNDANCE
    Surface metal/non-metal · Pete Lien & Sons Inc · MSHA ID 4801534
    Abandoned
  11. Missouri Mine
    Surface metal/non-metal · Federal Ore & Chemicals Inc · MSHA ID 4801125
    Abandoned
  12. Inertia Crusher
    Surface metal/non-metal · Ramsey Hill Exploration LLC · MSHA ID 4801853
    Temporarily Idled
  13. Jaw Crusher
    Surface metal/non-metal · Earth Work Solutions (WY) · MSHA ID 4801740
    Abandoned
  14. QAC #2
    Surface metal/non-metal · Quality Agg & Construction, Inc · MSHA ID 4801729
    Temporarily Idled
  15. UNIT # 45
    Surface metal/non-metal · Basic Energy Services, L.P. · MSHA ID 4801562
    Abandoned
  16. QAC #3
    Surface metal/non-metal · Quality Agg & Construction, Inc · MSHA ID 4801747
    Abandoned
  17. QAC #5
    Surface metal/non-metal · Quality Agg & Construction Inc · MSHA ID 4801785
    Abandoned
  18. Bruce Nygaard Plant
    Surface metal/non-metal · Fisher Sand & Gravel Company · MSHA ID 4801304
    Abandoned
  19. QAC #4
    Surface metal/non-metal · Quality Agg & Construction, Inc · MSHA ID 4801769
    Intermittent
  20. Willow Creek R R D Project
    Surface metal/non-metal · Malapai Resources Company · MSHA ID 4801449
    Abandoned
  21. Lake Ranch
    Surface metal/non-metal · Earth Work Solutions (WY) · MSHA ID 4801793
    Abandoned
  22. RC19041
    Surface metal/non-metal · Basic Energy Services LP · MSHA ID 4801716
    Abandoned
  23. UNIT 45-A
    Surface metal/non-metal · Basic Energy Services, L.P. · MSHA ID 4801596
    Abandoned
  24. Impactor Spread
    Surface metal/non-metal · Quality Agg & Construction, Inc · MSHA ID 4801816
    Intermittent
  25. Screen #3
    Surface metal/non-metal · Dan Hart Patrol Service LLC · MSHA ID 4801687
    Abandoned
  26. American Colloid Pits
    Surface metal/non-metal · American Colloid Company Minerals Group · MSHA ID 4800961
    Abandoned
  27. Burke & Roe Pit
    Surface metal/non-metal · Federal Bentonite Div/Aurora Metal Company · MSHA ID 4800618
    Abandoned
  28. Cedar Mine
    Surface metal/non-metal · International Minerals & Chemical Corp · MSHA ID 4800814
    Abandoned
  29. Crago Mine
    Surface metal/non-metal · Ramsey Hill Exploration LLC · MSHA ID 4801848
    Temporarily Idled
  30. Crusher
    Surface metal/non-metal · Crook County · MSHA ID 4801458
    Abandoned
  31. Crusher
    Surface metal/non-metal · Iron Creek Services, LLC · MSHA ID 4801894
    Intermittent
  32. Driskell Pit
    Surface metal/non-metal · Gilpatrick Construction Company Inc · MSHA ID 4801239
    Abandoned
  33. Mineral Hill Mine And Mill
    Underground metal/non-metal · Hoffman Engineering Corp · MSHA ID 4801322
    Abandoned
  34. Nubeth Joint Venture In-Situ Uranium Min
    Underground metal/non-metal · Nuclear Dynamics Inc · MSHA ID 4801228
    Abandoned
  35. P Q 1643
    Surface metal/non-metal · Hills Materials Company · MSHA ID 4801420
    Abandoned
  36. PORTABLE #1
    Surface metal/non-metal · N A Corp · MSHA ID 4801533
    Abandoned
  37. PORTABLE #2
    Surface metal/non-metal · N A Corp · MSHA ID 4801552
    Abandoned
  38. PORTABLE #3
    Surface metal/non-metal · N A Corp · MSHA ID 4801554
    Abandoned
  39. Ruby Pit
    Surface metal/non-metal · Don Lampert · MSHA ID 4801339
    Abandoned
  40. Sand & Gravel Operation
    Surface metal/non-metal · Roberts Construction Company · MSHA ID 4800313
    Abandoned
  41. Schundler Mine
    Surface metal/non-metal · N L Baroid-Div/N L Industries Inc · MSHA ID 4800899
    Abandoned
  42. Simmon Stockpile
    Surface metal/non-metal · Delzer Construction Company Inc · MSHA ID 4801168
    Abandoned
  43. State Pit
    Surface metal/non-metal · Delzer Construction Company Inc · MSHA ID 4801139
    Abandoned
  44. SUNDANCE PIT
    Surface metal/non-metal · Croell Redi-Mix Inc · MSHA ID 4801537
    Abandoned
  45. Sunset No 17 Pit
    Surface metal/non-metal · Federal Bentonite Div/Aurora Metal Company · MSHA ID 4800813
    Abandoned
  46. Triple Creek Ranches
    Surface metal/non-metal · Al Falzerano · MSHA ID 4801396
    Abandoned
  47. Watson Pit
    Surface metal/non-metal · Reeves Inc · MSHA ID 4801110
    Abandoned
  48. Wimco Mine
    Surface metal/non-metal · Applied Industrial Materials Corp (Aimcor) · MSHA ID 4800816
    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 WyomingAll 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.