U S Borax Inc: 2 open mines, 366 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
U S Borax Inc (MSHA operator ID L13075) operates 2 open mines with 629 employees in California, mostly boron minerals. Since January 1, 2022 MSHA inspectors issued it 366 citations and orders with $643,234 in proposed penalties, and it reported 40 injury or illness cases. Data from MSHA, November 6, 2026.
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- MSHA operator ID
- L13075
- Open mines
- 2
- Employees at open mines
- 629
- States
- California
- Parent company
- Rio Tinto Group
- Citations and orders since January 1, 2022
- 366
- Significant and substantial
- 77 (21.0%)
- Closure orders
- 7
- High negligence or reckless
- 29
- Proposed penalties
- $643,234
- Amount paid so far
- $579,363
- Inspections
- 59
- Inspector hours on site
- 1,569
- Citations per inspection
- 6.20 (all mines 2.30)
- Accident reports
- 41
- Injury and illness cases
- 40
- Fatalities
- 0
- Latest MSHA record
- October 14, 2026
Open mines of U S Borax Inc
Ranked by citations since January 1, 2022.
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Boron Operations | U S Borax Inc | Kern County, CA | Boron minerals | 624 | 364 |
| Owens Lake Mine | U S Borax Inc | Inyo County, CA | Trona | 5 | 2 |
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 | 54 | 12 | $77,696 | 10 |
| 2023 | 87 | 16 | $276,251 | 7 |
| 2024 | 101 | 22 | $130,271 | 9 |
| 2025 | 68 | 12 | $129,970 | 12 |
| 2026 | 56 | 15 | $29,046 | 2 |
Standards cited most at U S Borax Inc
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 56.14112 | Surface metal and nonmetal mines | 55 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 38 |
| 30 CFR 56.16001 | Surface metal and nonmetal mines | 24 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 23 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 23 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 22 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 15 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 12 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 12 |
| 30 CFR 56.12002 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.16005 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.11003 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.15001 | Surface metal and nonmetal mines | 5 |
Injury and illness cases at U S Borax Inc
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Permanent disability | 2 |
| Days away from work or restricted activity | 12 |
| No lost time, or an occupational illness | 26 |
What the accident reports at U S Borax Inc describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 12 |
| Slip or fall of person | 8 |
| Handtools (nonpowered) | 6 |
| Machinery | 4 |
| Disorders (repeated trauma) | 3 |
| Powered haulage | 2 |
| Disorders (physical agents) | 2 |
| Other | 2 |
| Exploding vessels under pressure | 1 |
| Striking or bumping | 1 |
Equipment named in accident reports at U S Borax Inc
| Equipment | Reports |
|---|---|
| Hand tools (not powered) | 6 |
| Hand tools (powered) | 3 |
| Carriage-mounted drills | 2 |
| Chute | 1 |
| Front-end loader | 1 |
| Bench grinder | 1 |
| Forklift | 1 |
Commodities
| Main commodity | Open mines |
|---|---|
| Boron minerals | 1 |
| Trona | 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.