Boron Operations
MSHA mine ID 0400743 · Kern County, CA
- Operator
- U S Borax Inc
- Controller
- Rio Tinto Group
- Mine status
- Active since Oct 8, 1975
- Mine type
- Surface
- Primary commodity
- Boron Minerals
- Citations issued
- Dec 9, 2024 to Oct 7, 2026
Past 24 months at a glance
- Inspections
- 28
- Citations and orders
- 156
- Marked S&S by MSHA
- 36
- Assessed penalties
- $155,837
143 of 156 citations have an MSHA assessment so far, first proposed at $182,605. 0 are marked contested.
Citations by standard
The 30 CFR section MSHA cited, most cited first.
| Standard | Citations | Assessed |
|---|---|---|
| 56.20003(a) | 13 | $10,785 |
| 56.12032 | 12 | $8,654 |
| 56.14107(a) | 12 | $5,888 |
| 56.16001 | 11 | $4,020 |
| 56.12004 | 10 | $3,563 |
| 56.14112(a)(1) | 10 | $4,136 |
| 56.14100(b) | 7 | $5,091 |
| 56.14112(b) | 7 | $5,744 |
| 50.30(a) | 4 | $604 |
| 56.12018 | 4 | $1,016 |
| 56.16005 | 4 | $974 |
| 56.11002 | 3 | $3,361 |
| 56.14101(a)(2) | 3 | $2,045 |
| 56.14132(b)(1)(i) | 3 | $870 |
| 56.17001 | 3 | $685 |
| 47.41(a) | 2 | $298 |
| 48.27(a) | 2 | $31,462 |
| 56.11003 | 2 | $493 |
| 56.12028 | 2 | $906 |
| 56.13021 | 2 | $298 |
| 56.14100(a) | 2 | $312 |
| 56.14105 | 2 | $31,380 |
| 56.18002(a) | 2 | $5,496 |
| 56.4104(b) | 2 | $324 |
| 56.4200(b)(2) | 2 | $328 |
Latest citations
| Issued | Assessed |
|---|---|
| Oct 7, 2026 No. 5166750 56.14132(b)(1)(i) | Not yet assessed |
| Oct 7, 2026 No. 5166082 56.4130(a)(3) | Not yet assessed |
| Oct 6, 2026 No. 5166749 56.12004 | Not yet assessed |
| Oct 6, 2026 No. 5166748 56.14112(a)(1) | Not yet assessed |
| Oct 6, 2026 No. 5166326 56.16001 | Not yet assessed |
| Oct 6, 2026 No. 5165349 56.20003(a) | Not yet assessed |
| Oct 6, 2026 No. 5165348 56.11002 | Not yet assessed |
| Oct 6, 2026 No. 5165347 56.12006 | Not yet assessed |
| Oct 5, 2026 No. 5166747 56.14107(a) | Not yet assessed |
| Sep 9, 2026 No. 5165652 56.14100(b) | Not yet assessed |
| Jul 23, 2026 No. 5166698 56.12032 | $226 Printed |
| Jul 22, 2026 No. 5166879 56.18002(a) | $3,184 Printed |
| Jul 22, 2026 No. 5166878 56.16001 | $432 Printed |
| Jul 22, 2026 No. 5166877 56.12004 | $1,431 Printed |
| Jul 22, 2026 No. 5166876 56.12032 | $3,184 Printed |
| Jul 22, 2026 No. 5166875 56.12032 | $193 Printed |
| Jul 22, 2026 No. 5166874 56.20003(a) | $151 Printed |
| Jul 22, 2026 No. 5166873 56.11002 | $3,184 Printed |
| Jul 22, 2026 No. 5166697 56.4201(a)(2) | $151 Printed |
| Jul 22, 2026 No. 5166696 56.14132(b)(1)(i) | $504 Closed |
| Jul 21, 2026 No. 5166872 56.20003(a) | $151 Printed |
| Jul 21, 2026 No. 5166871 56.20003(a) | $959 Printed |
| Jul 21, 2026 No. 5166695 56.12004 | Not yet assessed |
| Jul 21, 2026 No. 5166694 56.12035 | $151 Printed |
| Jul 15, 2026 No. 5166870 56.14105 | $151 Printed |
Latest inspections
Regular Safety and Health Inspection
Event F030FB6
Oct 5, 2026
103 (g) Written Notification Hazard Complaint Inspectio
Event F020C34
Sep 9, 2026 to Sep 10, 2026
Verbal Hazard Complaint Inspections
Event F020C33
Sep 8, 2026 to Sep 10, 2026
Compliance Follow-up Inspection
Event F04A75E
Sep 1, 2026 to Sep 2, 2026
Compliance Follow-up Inspection
Event F02C18D
Aug 25, 2026
Impoundment Spot Inspection
Event F0177E1
Aug 13, 2026
Regular Safety and Health Inspection
Event F02C59E
Jul 13, 2026 to Jul 24, 2026
103 (g) Written Notification Hazard Complaint Inspectio
Event F02C185
Jul 8, 2026
Spot Inspection
Event F02C180
Jun 16, 2026 to Jun 17, 2026
103 (g) Written Notification Hazard Complaint Inspectio
Event F02C17E
Jun 15, 2026 to Jul 13, 2026
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About this record
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