Data / Mines / Wyoming / Crook County
Mines in Crook County, Wyoming: 14 open mines
MSHA lists 14 open mines in Crook County, Wyoming, run by 6 operators and employing 313 people. Since January 1, 2022 its inspectors issued 191 citations and orders there with $43,069 in proposed penalties, and operators reported 44 injury or illness cases. The operators with the most open mines are American Colloid Company Mineral Group; Quality Agg & Construction Inc; Bentonite Performance Minerals, LLC. Data from MSHA, November 6, 2026.
SpecStream is the live web data engine for teams and agents. It reads the mine, citation, inspection and accident files that MSHA publishes, and this page is that reading. Ask for the mines of a commodity, state or operator with the operator's headquarters, website and size added from the web, and new mines, new citations and new accident reports arrive in your sheet, CRM, Slack or agent as MSHA posts them.
- Open mines
- 14
- Operators
- 6
- Employees
- 313
- Active
- 6
- Temporarily Idled
- 5
- Intermittent
- 2
- New Mine
- 1
- Mines run by individuals, counted and not listed
- 4
- Citations and orders since January 1, 2022
- 191
- Significant and substantial
- 25 (13.1%)
- Closure orders
- 2
- High negligence or reckless
- 13
- Proposed penalties
- $43,069
- Amount paid so far
- $42,787
- Inspections
- 118
- Inspector hours on site
- 1,250
- Citations per inspection
- 1.62 (all mines 2.30)
- Accident reports
- 44
- Injury and illness cases
- 44
- Fatalities
- 0
- Latest MSHA record
- November 2, 2026
Operators with the most open mines in Crook County, Wyoming
Ranked by open mines, then by citations. Sole proprietors and individuals are not listed.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| American Colloid Company Mineral Group | 3 | 141 | 84 | $18,111 | 31 |
| Quality Agg & Construction Inc | 3 | 9 | 6 | $874 | 0 |
| Bentonite Performance Minerals, LLC | 2 | 128 | 44 | $8,072 | 9 |
| Croell, Inc. | 1 | 4 | 10 | $3,287 | 1 |
| Iron Creek Services, LLC | 1 | 4 | 7 | $0 | 0 |
Operators with the most citations in Crook County, Wyoming
Citations and orders issued since January 1, 2022 at their open mines here.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| American Colloid Company Mineral Group | 3 | 141 | 84 | $18,111 | 31 |
| Bentonite Performance Minerals, LLC | 2 | 128 | 44 | $8,072 | 9 |
| Croell, Inc. | 1 | 4 | 10 | $3,287 | 1 |
| Iron Creek Services, LLC | 1 | 4 | 7 | $0 | 0 |
| Quality Agg & Construction Inc | 3 | 9 | 6 | $874 | 0 |
Mines with the most citations
Open mines, ranked by citations and orders since January 1, 2022.
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Belle/Colony Mine | American Colloid Company Mineral Group | Crook County, WY | Bentonite | 77 | 41 |
| BPM Colony Mill | Bentonite Performance Minerals, LLC | Crook County, WY | Bentonite | 70 | 34 |
| Colony West Mill | American Colloid Company Mineral Group | Crook County, WY | Bentonite | 30 | 23 |
| Colony East Mill | American Colloid Company Mineral Group | Crook County, WY | Bentonite | 34 | 20 |
| BPM Colony Mine | Bentonite Performance Minerals, LLC | Crook County, WY | Clay, ceramic, refractory mnls. | 58 | 10 |
| Crusher 2 | Croell, Inc. | Crook County, WY | Construction sand and gravel | 4 | 10 |
| Crusher | Iron Creek Services, LLC | Crook County, WY | Construction sand and gravel | 4 | 7 |
| Qac #2 | Quality Agg & Construction Inc | Crook County, WY | Construction sand and gravel | 3 | 4 |
| Qac #4 | Quality Agg & Construction Inc | Crook County, WY | Construction sand and gravel | 3 | 2 |
| Impactor Spread | Quality Agg & Construction Inc | Crook County, WY | Construction sand and gravel | 3 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Construction sand and gravel | 8 | 57.1% |
| Bentonite | 4 | 28.6% |
| Clay, ceramic, refractory mnls. | 1 | 7.1% |
Citations and injury cases by year
Calendar years since 2022; 2026 runs to the date of the MSHA files.
| Year | Citations and orders | Significant and substantial | Proposed penalties | Injury and illness cases |
|---|---|---|---|---|
| 2022 | 61 | 4 | $15,279 | 10 |
| 2023 | 23 | 6 | $6,828 | 13 |
| 2024 | 32 | 5 | $9,572 | 10 |
| 2025 | 36 | 4 | $7,749 | 9 |
| 2026 | 39 | 6 | $3,641 | 2 |
Standards cited most at mines in Crook County, Wyoming
Sections of Title 30 of the Code of Federal Regulations named on the citations, with the part each belongs to.
| Standard | What the part covers | Citations |
|---|---|---|
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 27 |
| 30 CFR 56.12030 | Surface metal and nonmetal mines | 17 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 17 |
| 30 CFR 56.14207 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 6 |
| 30 CFR 46.9 | Training at sand, gravel and surface stone mines | 6 |
| 30 CFR 47.41 | Hazard communication | 5 |
| 30 CFR 56.4102 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.16005 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.16003 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.14103 | Surface metal and nonmetal mines | 3 |
Injury and illness cases at mines in Crook County, Wyoming
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 30 |
| No lost time, or an occupational illness | 14 |
What the accident reports at mines in Crook County, Wyoming describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Powered haulage | 13 |
| Slip or fall of person | 10 |
| Handling of materials | 9 |
| Handtools (nonpowered) | 3 |
| Other | 3 |
| Machinery | 2 |
| Disorders (repeated trauma) | 1 |
| Stepping or kneeling on object | 1 |
| Exploding vessels under pressure | 1 |
| Striking or bumping | 1 |
Equipment named in accident reports at mines in Crook County, Wyoming
| Equipment | Reports |
|---|---|
| Scraper loader | 12 |
| Road grader | 4 |
| Hand tools (not powered) | 3 |
| Front-end loader | 2 |
| Trucks | 2 |
| Ore haulage trucks - off highway trucks | 2 |
| Classifier | 1 |
| Crane | 1 |
| Bulldozer | 1 |
| Crusher | 1 |
Updated November 6, 2026. Read from US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets. US government work, public domain. Counts come from the MSHA files published on November 6, 2026. An open mine is one MSHA lists as Active, Intermittent, New Mine, Temporarily Idled or NonProducing; 13,673 were open that day. Citations, penalties, inspections and accident reports run from January 1, 2022. A citation is an inspector's allegation and an operator can contest it; the penalty is the amount MSHA first proposed, before any contest or settlement. An operator is the legal entity MSHA assesses, and a parent company is its controller. Mines run by sole proprietors or by individuals are counted in every total and are not named. This page uses MSHA data and is not endorsed or certified by MSHA. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.