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Lost Hills Mining, LLC: OSHA inspections and violations

Lost Hills, California · Gypsum Product Manufacturing · NAICS 327420

5inspections
1citation items
$205current penalties
May 13, 2026last inspection

Lost Hills Mining, LLC has 5 OSHA inspections on record in California, the first in 2020.

OSHA's last visit started on May 13, 2026 as a planned inspection, in Lost Hills.

Across those inspections OSHA issued 1 citation item: 1 other-than-serious.

OSHA proposed $205 in penalties and the amount has not been reduced.

For context, across all manufacturing employers the median penalty per cited inspection since 2015 is $4,500. Lost Hills Mining, LLC averages $205 over 1 cited inspection in that time.

Lost Hills Mining, LLC: OSHA citation items per year, 2020 to 2026
Citation items per year, by inspection date.

California · latest 90 days of OSHA records

1,128employers cited

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Inspection history

Inspection 348937913 OPENED MAY 13, 2026Closed

Planned · Complete · Safety · 20 employees at the site · Closed Aug 17, 2026

13850 Holloway Rd., Lost Hills, CA 93249 · Gypsum Product Manufacturing · OSHA's record · Phone and website on Google Maps

No citations from this inspection.

Inspection 347752222 OPENED SEP 12, 2024Closed

Planned · Complete · Safety · 20 employees at the site · Closed Nov 20, 2024

13850 Holloway Rd., Lost Hills, CA 93249 · Gypsum Product Manufacturing · OSHA's record · Phone and website on Google Maps

No citations from this inspection.

Inspection 346786700 OPENED JUN 21, 2023Closed

Planned · Complete · Safety · 37 employees at the site · Closed Aug 28, 2023

13850 Holloway Rd., Lost Hills, CA 93249 · Gypsum Product Manufacturing · OSHA's record · Phone and website on Google Maps

Citation and ruleTypeProposedCurrentIssuedStatus
Citation 1, item 1
29 CFR 5162(A)
Other-than-serious$205$205Aug 16, 2023Final

Inspection 345172142 OPENED MAR 1, 2021Closed

Planned · Partial · Safety · 21 employees at the site · Closed Mar 1, 2021

13850 Holloway Rd., Lost Hills, CA 93249 · Gypsum Product Manufacturing · OSHA's record · Phone and website on Google Maps

No citations from this inspection.

Inspection 344771407 OPENED JUN 2, 2020Closed

Accident · Partial · Safety · 24 employees at the site · Closed Nov 10, 2020

13850 Holloway Rd, Lost Hills, CA 93249 · Other Chemical and Fertilizer Mineral Mining · OSHA's record · Phone and website on Google Maps

Incident on May 8, 2020: Mining employee contracts pneumonia and valley fever

In March and April 2020, an employee was working as an office manager at a gypsum surface mine. He was in charge of scale house operations. Although he regularly worked indoors in an air conditioned setting, he did work outdoors a couple of times. In early March, he cleared out weeds with a string trimmer. The employer offered him a dust mask and other required PPE. He spent less than half a day outdoors. On April 28, he and a supervisor and five coworkers dismantled a trailer tipper unit in an orchard. After a pre-job discussion, the crew drove to the site, dismantled the unit, and brought it back to the shop. On April 29, the unit was assembled in the shop. The supervisor left after lunch. The employee called the supervisor to say that he was not feeling well and was experiencing chest cramps. In accordance with the employer's emergency medical plan, he was taken to a nearby fire station, where an evaluation suggested he had a tender muscle in his chest. At about 1:30 a.m. on April 30, he went to an emergency room with a fever. He was discharged with general medication. On May 1, he was tested for COVID-19. He sought medical care several times over the next week, but his condition did not improve. At 8:30 a.m. on May 8, he was admitted to a different hospital, where he was diagnosed with double pneumonia. On May 12, he was again admitted to the second hospital. This time, he was diagnosed with Valley fever. He was released on May 15. On that day, he notified his employer of his diagnosis. He believed he contracted Valley fever while working outdoors on April 28. At 2:15 p.m. on May 15, the employer notified the Division, complying with reporting requirements. On June 2, the Division opened an inspection. Because Valley fever was endemic in the region and because the employee worked mostly indoors, Cal-OSHA could not determine if he contracted his illness at work. No citations were issued. COVID-19 did not play a role in the employee's pneumonia or Valley fever. pneumonia or Valley fever.

No citations from this inspection.

The rules behind these citations

Current text from the Code of Federal Regulations. Some citations were issued under older wording.

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Source: U.S. Department of Labor, OSHA enforcement data. A citation is OSHA's allegation; employers can contest it, and the status column shows where each item stands. Something wrong on this page? Tell us.