Data / Mines / California / Nonmetal mines

Nonmetal mineral mines in California: 52 open mines

MSHA lists 52 open nonmetal mineral mines in California, run by 48 operators and employing 1,423 people. Since January 1, 2022 its inspectors issued 1,614 citations and orders there with $1,588,775 in proposed penalties, and operators reported 129 injury or illness cases. The operators with the most open mines are U S Borax Inc; Protech Minerals, LLC; Granite Construction Company. Data from MSHA, November 6, 2026.

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Open mines

52

Operators

48

Employees

1,423

Active

42

Intermittent

10

Mines run by individuals, counted and not listed

1

Citations and orders since January 1, 2022

1,614

Significant and substantial

370 (22.9%)

Closure orders

48

High negligence or reckless

193

Proposed penalties

$1,588,775

Amount paid so far

$1,403,720

Inspections

653

Inspector hours on site

5,883

Citations per inspection

2.47 (all mines 2.30)

Accident reports

133

Injury and illness cases

129

Fatalities

0

Latest MSHA record

November 4, 2026

Operators with the most open mines in California

Ranked by open mines, then by citations. Sole proprietors and individuals are not listed.

Operators with the most citations in California

Citations and orders issued since January 1, 2022 at their open mines here.

Mines with the most citations

Open mines, ranked by citations and orders since January 1, 2022.

Main commodities

Citations and injury cases by year

Calendar years since 2022; 2026 runs to the date of the MSHA files.

Standards cited most at nonmetal mineral mines in California

Sections of Title 30 of the Code of Federal Regulations named on the citations, with the part each belongs to.

Injury and illness cases at nonmetal mineral mines in California

Accident reports by degree of injury, as the operator reported them to MSHA.

What the accident reports at nonmetal mineral mines in California describe

Accident classification, as MSHA codes the circumstances that contributed most directly.

Equipment named in accident reports at nonmetal mineral mines in California

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.