Data / Mines / California

Mines in California: 423 open mines and MSHA citations

MSHA lists 423 open mines in California, run by 259 operators and employing 7,560 people. Since January 1, 2022 its inspectors issued 9,860 citations and orders there with $7,185,196 in proposed penalties, and operators reported 793 injury or illness cases, 5 of them fatal. The operators with the most open mines are CalMat Co; Granite Construction Company; CalPortland Company. Data from MSHA, November 6, 2026.

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Open mines

423

Operators

259

Employees

7,560

Active

302

Intermittent

109

Temporarily Idled

9

NonProducing

2

New Mine

1

Mines run by individuals, counted and not listed

20

Citations and orders since January 1, 2022

9,860

Significant and substantial

1,978 (20.1%)

Closure orders

288

High negligence or reckless

767

Proposed penalties

$7,185,196

Amount paid so far

$5,570,359

Inspections

5,258

Inspector hours on site

41,572

Citations per inspection

1.88 (all mines 2.30)

Accident reports

842

Injury and illness cases

793

Fatalities

5

Latest MSHA record

November 5, 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.

Counties

Mines by kind

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 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 mines in California

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

What the accident reports at mines in California describe

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

Equipment named in accident reports at 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.