Data / Mines / Wyoming / Natrona County
Mines in Natrona County, Wyoming: 19 open mines
MSHA lists 19 open mines in Natrona County, Wyoming, run by 8 operators and employing 82 people. Since January 1, 2022 its inspectors issued 265 citations and orders there with $109,093 in proposed penalties, and operators reported 17 injury or illness cases. The operators with the most open mines are Mobile Concrete Inc; JTL Group, Inc.; Black Hills Bentonite-A Limited Liability Co. Data from MSHA, November 6, 2026.
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- Open mines
- 19
- Operators
- 8
- Employees
- 82
- Intermittent
- 9
- Temporarily Idled
- 7
- Active
- 3
- Mines run by individuals, counted and not listed
- 1
- Citations and orders since January 1, 2022
- 265
- Significant and substantial
- 56 (21.1%)
- Closure orders
- 3
- High negligence or reckless
- 13
- Proposed penalties
- $109,093
- Amount paid so far
- $103,825
- Inspections
- 124
- Inspector hours on site
- 820
- Citations per inspection
- 2.14 (all mines 2.30)
- Accident reports
- 17
- Injury and illness cases
- 17
- Fatalities
- 0
- Latest MSHA record
- October 8, 2026
Operators with the most open mines in Natrona 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 |
|---|---|---|---|---|---|
| Mobile Concrete Inc | 5 | 13 | 30 | $6,998 | 0 |
| JTL Group, Inc. | 5 | 9 | 22 | $6,837 | 0 |
| Black Hills Bentonite-A Limited Liability Co | 3 | 42 | 102 | $32,782 | 16 |
| Tolsa Wyoming Bentonite Corp. | 2 | 9 | 85 | $56,892 | 1 |
| 71 Construction | 1 | 2 | 11 | $2,787 | 0 |
| Brutill Construction, Inc | 1 | 3 | 4 | $580 | 0 |
| E H Oftedal & Sons Inc | 1 | 2 | 4 | $798 | 0 |
Operators with the most citations in Natrona 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 |
|---|---|---|---|---|---|
| Black Hills Bentonite-A Limited Liability Co | 3 | 42 | 102 | $32,782 | 16 |
| Tolsa Wyoming Bentonite Corp. | 2 | 9 | 85 | $56,892 | 1 |
| Mobile Concrete Inc | 5 | 13 | 30 | $6,998 | 0 |
| JTL Group, Inc. | 5 | 9 | 22 | $6,837 | 0 |
| 71 Construction | 1 | 2 | 11 | $2,787 | 0 |
| Brutill Construction, Inc | 1 | 3 | 4 | $580 | 0 |
| E H Oftedal & Sons Inc | 1 | 2 | 4 | $798 | 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 |
|---|---|---|---|---|---|
| Tolsa Wyoming Bentonite Plant | Tolsa Wyoming Bentonite Corp. | Natrona County, WY | Bentonite | 8 | 85 |
| Mills Plant | Black Hills Bentonite-A Limited Liability Co | Natrona County, WY | Bentonite | 20 | 54 |
| Casper Plant | Black Hills Bentonite-A Limited Liability Co | Natrona County, WY | Bentonite | 12 | 30 |
| HT Plant | Black Hills Bentonite-A Limited Liability Co | Natrona County, WY | Bentonite | 10 | 18 |
| Crusher #7 | JTL Group, Inc. | Natrona County, WY | Construction sand and gravel | 2 | 16 |
| Fold & Go Screen | Mobile Concrete Inc | Natrona County, WY | Construction sand and gravel | 2 | 11 |
| Advanced Screenplant | 71 Construction | Natrona County, WY | Construction sand and gravel | 2 | 11 |
| Cedarapids Screen | Mobile Concrete Inc | Natrona County, WY | Construction sand and gravel | 2 | 7 |
| El Jay | Mobile Concrete Inc | Natrona County, WY | Construction sand and gravel | 3 | 6 |
| Crusher #4 | JTL Group, Inc. | Natrona County, WY | Construction sand and gravel | 3 | 5 |
| Jci K200-6203CC | Mobile Concrete Inc | Natrona County, WY | Construction sand and gravel | 3 | 5 |
| Screen #3 | Brutill Construction, Inc | Natrona County, WY | Construction sand and gravel | 3 | 4 |
| Oftedal Crusher #1 | E H Oftedal & Sons Inc | Natrona County, WY | Gypsum | 2 | 4 |
| Portable Screening Plant | Mobile Concrete Inc | Natrona County, WY | Construction sand and gravel | 3 | 1 |
| Casper Pit | JTL Group, Inc. | Natrona County, WY | Construction sand and gravel | 2 | 1 |
| Crusher #6 | JTL Group, Inc. | Natrona County, WY | Crushed, broken limestone | 2 | 0 |
| Tolsa Mines | Tolsa Wyoming Bentonite Corp. | Natrona County, WY | Bentonite | 1 | 0 |
| Crusher #2 | JTL Group, Inc. | Natrona County, WY | Crushed, broken stone | 0 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Construction sand and gravel | 11 | 57.9% |
| Bentonite | 5 | 26.3% |
| Gypsum | 1 | 5.3% |
| Crushed, broken stone | 1 | 5.3% |
| Crushed, broken limestone | 1 | 5.3% |
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 | 72 | 19 | $35,291 | 2 |
| 2023 | 43 | 9 | $12,743 | 6 |
| 2024 | 111 | 23 | $51,658 | 5 |
| 2025 | 25 | 3 | $6,590 | 1 |
| 2026 | 14 | 2 | $2,811 | 3 |
Standards cited most at mines in Natrona 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 56.14107 | Surface metal and nonmetal mines | 44 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 17 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 15 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 14 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 12 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 12 |
| 30 CFR 56.11012 | Surface metal and nonmetal mines | 11 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 10 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 10 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.5001 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 6 |
Injury and illness cases at mines in Natrona County, Wyoming
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 15 |
| No lost time, or an occupational illness | 2 |
What the accident reports at mines in Natrona County, Wyoming describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Slip or fall of person | 6 |
| Handling of materials | 4 |
| Machinery | 2 |
| Handtools (nonpowered) | 2 |
| Powered haulage | 2 |
| Stepping or kneeling on object | 1 |
Equipment named in accident reports at mines in Natrona County, Wyoming
| Equipment | Reports |
|---|---|
| Packaging machine | 2 |
| Hand tools (not powered) | 2 |
| Fan | 1 |
| Mine car | 1 |
| Conveyor | 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.