Data / Mines / Oklahoma / Johnston County
Mines in Johnston County, Oklahoma: 9 open mines
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
MSHA lists 9 open mines in Johnston County, Oklahoma, run by 8 operators and employing 277 people. Since January 1, 2022 its inspectors issued 249 citations and orders there with $106,435 in proposed penalties, and operators reported 22 injury or illness cases. The operators with the most open mines are U.S. Silica Company, LLC; Mill Creek Dolomite LLC; P&K Stone LLC. Data from MSHA, November 6, 2026.
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- Open mines
- 9
- Operators
- 8
- Employees
- 277
- Active
- 9
- Citations and orders since January 1, 2022
- 249
- Significant and substantial
- 46 (18.5%)
- Closure orders
- 3
- High negligence or reckless
- 8
- Proposed penalties
- $106,435
- Amount paid so far
- $99,520
- Inspections
- 99
- Inspector hours on site
- 1,196
- Citations per inspection
- 2.52 (all mines 2.30)
- Accident reports
- 24
- Injury and illness cases
- 22
- Fatalities
- 0
- Latest MSHA record
- October 22, 2026
Operators with the most open mines in Johnston County, Oklahoma
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 |
|---|---|---|---|---|---|
| U.S. Silica Company, LLC | 2 | 72 | 32 | $5,202 | 7 |
| Mill Creek Dolomite LLC | 1 | 15 | 85 | $68,564 | 2 |
| P&K Stone LLC | 1 | 20 | 55 | $19,363 | 3 |
| Martin Marietta Materials Southwest, LLC | 1 | 60 | 30 | $4,499 | 4 |
| Heidelberg Materials Southwest LLC | 1 | 5 | 17 | $2,826 | 0 |
| Amrize South Central Inc. | 1 | 7 | 14 | $2,890 | 1 |
| Vulcan Construction Materials, LLC | 1 | 55 | 11 | $2,260 | 4 |
| Martin Marietta Materials, Inc. | 1 | 43 | 5 | $831 | 1 |
Operators with the most citations in Johnston County, Oklahoma
Citations and orders issued since January 1, 2022 at their open mines here.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Mill Creek Dolomite LLC | 1 | 15 | 85 | $68,564 | 2 |
| P&K Stone LLC | 1 | 20 | 55 | $19,363 | 3 |
| U.S. Silica Company, LLC | 2 | 72 | 32 | $5,202 | 7 |
| Martin Marietta Materials Southwest, LLC | 1 | 60 | 30 | $4,499 | 4 |
| Heidelberg Materials Southwest LLC | 1 | 5 | 17 | $2,826 | 0 |
| Amrize South Central Inc. | 1 | 7 | 14 | $2,890 | 1 |
| Vulcan Construction Materials, LLC | 1 | 55 | 11 | $2,260 | 4 |
| Martin Marietta Materials, Inc. | 1 | 43 | 5 | $831 | 1 |
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 |
|---|---|---|---|---|---|
| Mill Creek Dolomite | Mill Creek Dolomite LLC | Johnston County, OK | Crushed, broken limestone | 15 | 85 |
| Mill Creek Quarry | P&K Stone LLC | Johnston County, OK | Crushed, broken granite | 20 | 55 |
| Mill Creek Limestone Quarry | Martin Marietta Materials Southwest, LLC | Johnston County, OK | Crushed, broken limestone | 60 | 30 |
| Mill Creek Plant #39 | U.S. Silica Company, LLC | Johnston County, OK | Crushed, broken sandstone | 49 | 24 |
| Mill Creek Quarry | Heidelberg Materials Southwest LLC | Johnston County, OK | Dimension limestone | 5 | 17 |
| Amrize Coleman Quarry | Amrize South Central Inc. | Johnston County, OK | Crushed, broken limestone | 7 | 14 |
| North Troy | Vulcan Construction Materials, LLC | Johnston County, OK | Crushed, broken limestone | 55 | 11 |
| Mill Creek Plant #37 | U.S. Silica Company, LLC | Johnston County, OK | Sand, industrial | 23 | 8 |
| Mill Creek | Martin Marietta Materials, Inc. | Johnston County, OK | Crushed, broken granite | 43 | 5 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Crushed, broken limestone | 4 | 44.4% |
| Crushed, broken granite | 2 | 22.2% |
| Sand, industrial | 1 | 11.1% |
| Crushed, broken sandstone | 1 | 11.1% |
| Dimension limestone | 1 | 11.1% |
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 | 26 | 2 | $11,061 | 4 |
| 2023 | 31 | 10 | $7,250 | 4 |
| 2024 | 77 | 12 | $30,556 | 5 |
| 2025 | 59 | 5 | $37,037 | 5 |
| 2026 | 56 | 17 | $20,531 | 4 |
Standards cited most at mines in Johnston County, Oklahoma
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 56.20003 | Surface metal and nonmetal mines | 31 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 23 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 23 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.4101 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.11012 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 6 |
| 30 CFR 47.41 | Hazard communication | 5 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 5 |
Injury and illness cases at mines in Johnston County, Oklahoma
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 14 |
| No lost time, or an occupational illness | 8 |
What the accident reports at mines in Johnston County, Oklahoma describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 8 |
| Slip or fall of person | 5 |
| Handtools (nonpowered) | 4 |
| Machinery | 3 |
| Other | 3 |
| Fire | 1 |
Equipment named in accident reports at mines in Johnston County, Oklahoma
| Equipment | Reports |
|---|---|
| Hand tools (not powered) | 4 |
| Hand tools (powered) | 2 |
| Crusher | 1 |
| Conveyor | 1 |
| Ore haulage trucks - off highway trucks | 1 |
| Front-end loader | 1 |
| Forklift | 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.