Data / Mines / Wyoming / Platte County
Mines in Platte County, Wyoming: 10 open mines
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
MSHA lists 10 open mines in Platte County, Wyoming, run by 9 operators and employing 45 people. Since January 1, 2022 its inspectors issued 79 citations and orders there with $23,854 in proposed penalties, and operators reported 7 injury or illness cases. The operators with the most open mines are Croell, Inc.; JTL Group, Inc.; Martin Marietta Materials, Inc.. Data from MSHA, November 6, 2026.
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- Open mines
- 10
- Operators
- 9
- Employees
- 45
- Intermittent
- 5
- Temporarily Idled
- 4
- Active
- 1
- Citations and orders since January 1, 2022
- 79
- Significant and substantial
- 12 (15.2%)
- Closure orders
- 4
- High negligence or reckless
- 10
- Proposed penalties
- $23,854
- Amount paid so far
- $19,909
- Inspections
- 66
- Inspector hours on site
- 374
- Citations per inspection
- 1.20 (all mines 2.30)
- Accident reports
- 7
- Injury and illness cases
- 7
- Fatalities
- 0
- Latest MSHA record
- September 28, 2026
Operators with the most open mines in Platte 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 |
|---|---|---|---|---|---|
| Croell, Inc. | 2 | 8 | 15 | $2,412 | 2 |
| JTL Group, Inc. | 1 | 14 | 19 | $9,341 | 4 |
| Martin Marietta Materials, Inc. | 1 | 10 | 18 | $6,333 | 1 |
| Wyoming Sand Company LLC | 1 | 3 | 11 | $2,468 | 0 |
| 383 Construction LLC | 1 | 3 | 10 | $1,563 | 0 |
| Peak Gravel LLC | 1 | 1 | 3 | $1,310 | 0 |
| New Sunrise, LLC | 1 | 1 | 2 | $294 | 0 |
| Alexander Construction Company | 1 | 3 | 1 | $133 | 0 |
| Collins Quarry And Construction LLC | 1 | 2 | 0 | $0 | 0 |
Operators with the most citations in Platte 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 |
|---|---|---|---|---|---|
| JTL Group, Inc. | 1 | 14 | 19 | $9,341 | 4 |
| Martin Marietta Materials, Inc. | 1 | 10 | 18 | $6,333 | 1 |
| Croell, Inc. | 2 | 8 | 15 | $2,412 | 2 |
| Wyoming Sand Company LLC | 1 | 3 | 11 | $2,468 | 0 |
| 383 Construction LLC | 1 | 3 | 10 | $1,563 | 0 |
| Peak Gravel LLC | 1 | 1 | 3 | $1,310 | 0 |
| New Sunrise, LLC | 1 | 1 | 2 | $294 | 0 |
| Alexander Construction Company | 1 | 3 | 1 | $133 | 0 |
| Collins Quarry And Construction LLC | 1 | 2 | 0 | $0 | 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 |
|---|---|---|---|---|---|
| Crusher #3 | JTL Group, Inc. | Platte County, WY | Construction sand and gravel | 14 | 19 |
| Guernsey Quarry | Martin Marietta Materials, Inc. | Platte County, WY | Crushed, broken limestone | 10 | 18 |
| Crusher 1 | Croell, Inc. | Platte County, WY | Construction sand and gravel | 6 | 15 |
| Wyoming SiO2 Plant | Wyoming Sand Company LLC | Platte County, WY | Construction sand and gravel | 3 | 11 |
| Crusher #2 | 383 Construction LLC | Platte County, WY | Construction sand and gravel | 3 | 10 |
| Dodge Pit | Peak Gravel LLC | Platte County, WY | Construction sand and gravel | 1 | 3 |
| Sunrise | New Sunrise, LLC | Platte County, WY | Iron ore | 1 | 2 |
| Alexander Construction | Alexander Construction Company | Platte County, WY | Construction sand and gravel | 3 | 1 |
| Wash Plant 3 | Croell, Inc. | Platte County, WY | Construction sand and gravel | 2 | 0 |
| Collins Quarry | Collins Quarry And Construction LLC | Platte County, WY | Construction sand and gravel | 2 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Construction sand and gravel | 8 | 80% |
| Crushed, broken limestone | 1 | 10% |
| Iron ore | 1 | 10% |
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 | 18 | 4 | $10,926 | 0 |
| 2023 | 17 | 0 | $3,365 | 0 |
| 2024 | 14 | 2 | $2,760 | 3 |
| 2025 | 26 | 4 | $5,325 | 4 |
| 2026 | 4 | 2 | $1,478 | 0 |
Standards cited most at mines in Platte 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 | 7 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.1000 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.4200 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 2 |
| 30 CFR 46.7 | Training at sand, gravel and surface stone mines | 2 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 2 |
| 30 CFR 46.9 | Training at sand, gravel and surface stone mines | 2 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 2 |
Injury and illness cases at mines in Platte County, Wyoming
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Permanent disability | 1 |
| Days away from work or restricted activity | 3 |
| No lost time, or an occupational illness | 3 |
What the accident reports at mines in Platte County, Wyoming describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 4 |
| Slip or fall of person | 2 |
| Other | 1 |
Equipment named in accident reports at mines in Platte County, Wyoming
| Equipment | Reports |
|---|---|
| Bulldozer | 1 |
| Front-end loader | 1 |
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.