Boron Operations
Active
Surface
Nonmetal
Operator: U S Borax Inc
Controller: Rio Tinto Group
Location: Boron, Kern County, CA
Employees: 624
1,981
Violations
332
S&S Violations
344
Accidents
$1.8M
Penalties
Recent Violations
View all 1,981 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 11/19/2025 | 56.20003(a) | S&S | LowNegligence | $959 |
| 11/19/2025 | 56.14112(b) | Non-S&S | LowNegligence | $465 |
| 11/19/2025 | 56.12028 | Non-S&S | ModNegligence | $755 |
| 11/19/2025 | 48.28(a) | Non-S&S | ModNegligence | $151 |
| 11/18/2025 | 56.4200(b)(2) | Non-S&S | LowNegligence | $177 |
| 11/18/2025 | 56.4201(a)(2) | Non-S&S | ModNegligence | $398 |
| 11/18/2025 | 56.12004 | Non-S&S | LowNegligence | $151 |
| 11/17/2025 | 56.17001 | Non-S&S | ModNegligence | $267 |
| 11/17/2025 | 56.17001 | Non-S&S | ModNegligence | $267 |
| 11/17/2025 | 56.12020 | Non-S&S | LowNegligence | $398 |
| 11/17/2025 | 56.16001 | Non-S&S | LowNegligence | $151 |
| 11/17/2025 | 56.16001 | Non-S&S | LowNegligence | $151 |
| 11/17/2025 | 56.16001 | Non-S&S | LowNegligence | $151 |
| 11/13/2025 | 56.12030 | Non-S&S | LowNegligence | $177 |
| 11/13/2025 | 56.16005 | Non-S&S | ModNegligence | $267 |
| 11/13/2025 | 56.20003(a) | Non-S&S | LowNegligence | $226 |
| 11/12/2025 | 56.14107(a) | Non-S&S | LowNegligence | $398 |
| 11/12/2025 | 56.16001 | Non-S&S | LowNegligence | $151 |
| 11/12/2025 | 56.11003 | Non-S&S | ModNegligence | $267 |
| 11/05/2025 | 56.12032 | Non-S&S | LowNegligence | $366 |
Accidents & Injuries
View all 344 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 12/27/2025 | SLIP OR FALL OF PERSON | DAYS AWAY FROM WORK ONLY | None |
| 12/01/2025 | HANDLING OF MATERIALS | DAYS AWAY FROM WORK ONLY | 28d lost |
| 10/16/2025 | HANDTOOLS (NONPOWERED) | DYS AWY FRM WRK & RESTRCTD ACT | 2d lost, 50d restricted |
| 10/07/2025 | DISORDERS (REPEATED TRAUMA) | OCCUPATNAL ILLNESS NOT DEG 1-6 | None |
| 08/26/2025 | DISORDERS (REPEATED TRAUMA) | OCCUPATNAL ILLNESS NOT DEG 1-6 | None |
| 08/11/2025 | POWERED HAULAGE | PERM TOT OR PERM PRTL DISABLTY | None |
| 08/07/2025 | DISORDERS (REPEATED TRAUMA) | OCCUPATNAL ILLNESS NOT DEG 1-6 | None |
| 06/23/2025 | HANDTOOLS (NONPOWERED) | DAYS RESTRICTED ACTIVITY ONLY | 120d restricted |
| 04/13/2025 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 04/13/2025 | HANDTOOLS (NONPOWERED) | NO DYS AWY FRM WRK,NO RSTR ACT | None |
Inspections
View all 224 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 03/04/2026 | 03/04/2026 | 2.75 | 1 |
| 01/26/2026 | 01/27/2026 | 6.50 | 1 |
| 11/13/2025 | 11/13/2025 | 4.50 | 1 |
| 11/03/2025 | 11/19/2025 | 230.25 | 3 |
| 09/24/2025 | 09/24/2025 | 7.75 | 1 |
| 08/25/2025 | 08/27/2025 | 21.00 | 1 |
| 08/14/2025 | 08/14/2025 | 8.00 | 1 |
| 08/11/2025 | 08/21/2025 | 79.50 | 1 |
| 05/22/2025 | 05/22/2025 | 15.00 | 1 |
| 05/12/2025 | 05/14/2025 | 15.75 | 2 |
Mine Details
MSHA Mine ID0400743
Mine TypeSurface
StatusActive
CommodityNonmetal
SIC DescriptionBoron Minerals
Employees624
Days/Week7.0
Hours/Shift10.0
Coordinates35.0222220, -117.7033330
Nearest TownBoron
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Frequently Asked Questions
How many MSHA violations does Boron Operations have?
Boron Operations has 1981 MSHA violations on record, of which 332 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $1.8M.
What type of mine is Boron Operations?
Boron Operations is a Surface mine producing Nonmetal, located in Boron, Kern County, CA. It currently has 624 employees.
Has anyone been injured or killed at Boron Operations?
According to MSHA records, Boron Operations has 344 reported accident/injury records and 0 fatalities on file.
Who operates Boron Operations?
Boron Operations is operated by U S Borax Inc and controlled by Rio Tinto Group. MSHA Mine ID: 0400743.