Data / Mines / Crushed, broken limestone

Crushed, broken limestone mines in the US: 1,950 open mines

MSHA lists 1,950 open crushed, broken limestone mines in the US, run by 887 operators and employing 24,303 people. Since January 1, 2022 its inspectors issued 38,001 citations and orders there with $17,598,344 in proposed penalties, and operators reported 2,834 injury or illness cases, 27 of them fatal. The operators with the most open mines are Martin Marietta Materials, Inc.; Vulcan Construction Materials, LLC; Rogers Group Inc. Data from MSHA, November 6, 2026.

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Open mines

1,950

Operators

887

Employees

24,303

Active

1,402

Intermittent

500

Temporarily Idled

37

NonProducing

9

New Mine

2

Mines run by individuals, counted and not listed

57

Citations and orders since January 1, 2022

38,001

Significant and substantial

6,538 (17.2%)

Closure orders

683

High negligence or reckless

1,995

Proposed penalties

$17,598,344

Amount paid so far

$14,254,386

Inspections

23,310

Inspector hours on site

271,393

Citations per inspection

1.63 (all mines 2.30)

Accident reports

2,999

Injury and illness cases

2,834

Fatalities

27

Latest MSHA record

November 5, 2026

Operators with the most open mines

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

Operators with the most citations

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.

States

Citations and injury cases by year

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

Standards cited most at crushed, broken limestone mines

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 crushed, broken limestone mines

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

What the accident reports at crushed, broken limestone mines describe

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

Equipment named in accident reports at crushed, broken limestone mines

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.