Data / Mines / Wyoming / Nonmetal mines

Nonmetal mineral mines in Wyoming: 40 open mines

MSHA lists 40 open nonmetal mineral mines in Wyoming, run by 17 operators and employing 2,971 people. Since January 1, 2022 its inspectors issued 3,605 citations and orders there with $2,091,036 in proposed penalties, and operators reported 310 injury or illness cases, 1 of them fatal. The operators with the most open mines are Black Hills Bentonite-A Limited Liability Co; Wyo-Ben, Inc; American Colloid Company Mineral Group. Data from MSHA, November 6, 2026.

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Open mines

40

Operators

17

Employees

2,971

Active

31

Temporarily Idled

6

Intermittent

3

Citations and orders since January 1, 2022

3,605

Significant and substantial

448 (12.4%)

Closure orders

23

High negligence or reckless

180

Proposed penalties

$2,091,036

Amount paid so far

$1,638,537

Inspections

1,892

Inspector hours on site

25,350

Citations per inspection

1.91 (all mines 2.30)

Accident reports

374

Injury and illness cases

310

Fatalities

1

Latest MSHA record

November 5, 2026

Operators with the most open mines in Wyoming

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

Operators with the most citations in Wyoming

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 Wyoming

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 Wyoming

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

What the accident reports at nonmetal mineral mines in Wyoming describe

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

Equipment named in accident reports at nonmetal mineral mines in Wyoming

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.