Pumice mines in the US: 12 open mines and MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
MSHA lists 12 open pumice mines in the US, run by 9 operators and employing 131 people. Since January 1, 2022 its inspectors issued 285 citations and orders there with $223,047 in proposed penalties, and operators reported 1 injury or illness case. The operators with the most open mines are Hess Pumice Products Inc; Monarch Mountain Minerals & Aggregates, LLC; E & S Mining & Trucking Co Inc. Data from MSHA, November 6, 2026.
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- Open mines
- 12
- Operators
- 9
- Employees
- 131
- Active
- 9
- Intermittent
- 3
- Citations and orders since January 1, 2022
- 285
- Significant and substantial
- 54 (18.9%)
- Closure orders
- 5
- High negligence or reckless
- 37
- Proposed penalties
- $223,047
- Amount paid so far
- $183,031
- Inspections
- 133
- Inspector hours on site
- 842
- Citations per inspection
- 2.14 (all mines 2.30)
- Accident reports
- 1
- Injury and illness cases
- 1
- Fatalities
- 0
- Latest MSHA record
- October 14, 2026
Operators with the most open mines
Ranked by open mines, then by citations. Sole proprietors and individuals are not listed.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Hess Pumice Products Inc | 2 | 91 | 73 | $98,172 | 0 |
| Monarch Mountain Minerals & Aggregates, LLC | 2 | 11 | 19 | $4,737 | 0 |
| E & S Mining & Trucking Co Inc | 2 | 7 | 5 | $755 | 0 |
| Calvert USA, LLC | 1 | 4 | 56 | $87,652 | 1 |
| Cr Minerals Company LLC | 1 | 2 | 35 | $9,650 | 0 |
| Allied Building Materials Inc / Cind R Lite Block | 1 | 5 | 33 | $6,107 | 0 |
| Global Pumice, LLC | 1 | 4 | 29 | $7,560 | 0 |
| South Chemult Pumice Resources LLC. | 1 | 3 | 20 | $5,939 | 0 |
| Mark Latham Excavation | 1 | 4 | 15 | $2,475 | 0 |
Operators with the most citations
Citations and orders issued since January 1, 2022 at their open mines here.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Hess Pumice Products Inc | 2 | 91 | 73 | $98,172 | 0 |
| Calvert USA, LLC | 1 | 4 | 56 | $87,652 | 1 |
| Cr Minerals Company LLC | 1 | 2 | 35 | $9,650 | 0 |
| Allied Building Materials Inc / Cind R Lite Block | 1 | 5 | 33 | $6,107 | 0 |
| Global Pumice, LLC | 1 | 4 | 29 | $7,560 | 0 |
| South Chemult Pumice Resources LLC. | 1 | 3 | 20 | $5,939 | 0 |
| Monarch Mountain Minerals & Aggregates, LLC | 2 | 11 | 19 | $4,737 | 0 |
| Mark Latham Excavation | 1 | 4 | 15 | $2,475 | 0 |
| E & S Mining & Trucking Co Inc | 2 | 7 | 5 | $755 | 0 |
Mines with the most citations
Open mines, ranked by citations and orders since January 1, 2022.
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Calvert Mine | Calvert USA, LLC | Norton County, KS | Pumice | 4 | 56 |
| Malad Plant | Hess Pumice Products Inc | Oneida County, ID | Pumice | 74 | 53 |
| Rocky Mountain Mine | Cr Minerals Company LLC | Rio Arriba County, NM | Pumice | 2 | 35 |
| Cind R Lite Cinder Cone Mine | Allied Building Materials Inc / Cind R Lite Block | Nye County, NV | Pumice | 5 | 33 |
| Makayla | Global Pumice, LLC | Inyo County, CA | Pumice | 4 | 29 |
| Wrights Creek Mine | Hess Pumice Products Inc | Oneida County, ID | Pumice | 17 | 20 |
| South Chemult Pumice Resources LLC | South Chemult Pumice Resources LLC. | Klamath County, OR | Pumice | 3 | 20 |
| Plant #1-Roll Crusher/Powerscrn | Mark Latham Excavation | Deschutes County, OR | Pumice | 4 | 15 |
| Cerrito Pelado | Monarch Mountain Minerals & Aggregates, LLC | Santa Fe County, NM | Pumice | 4 | 12 |
| Glass Mountain Pumice | Monarch Mountain Minerals & Aggregates, LLC | Modoc County, CA | Pumice | 7 | 7 |
| Gooding Site | E & S Mining & Trucking Co Inc | Gooding County, ID | Pumice | 4 | 3 |
| Moonstone | E & S Mining & Trucking Co Inc | Idaho County, ID | Pumice | 3 | 2 |
States
| State | Open mines | Share |
|---|---|---|
| Idaho | 4 | 33.3% |
| California | 2 | 16.7% |
| New Mexico | 2 | 16.7% |
| Oregon | 2 | 16.7% |
| Kansas | 1 | 8.3% |
| Nevada | 1 | 8.3% |
Citations and injury cases by year
Calendar years since 2022; 2026 runs to the date of the MSHA files.
| Year | Citations and orders | Significant and substantial | Proposed penalties | Injury and illness cases |
|---|---|---|---|---|
| 2022 | 57 | 16 | $31,005 | 0 |
| 2023 | 75 | 19 | $137,170 | 1 |
| 2024 | 51 | 6 | $16,620 | 0 |
| 2025 | 60 | 8 | $28,497 | 0 |
| 2026 | 42 | 5 | $9,755 | 0 |
Standards cited most at pumice mines
Sections of Title 30 of the Code of Federal Regulations named on the citations, with the part each belongs to.
| Standard | What the part covers | Citations |
|---|---|---|
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 24 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 22 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 21 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 18 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 18 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 14 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 10 |
| 30 CFR 56.14207 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 5 |
Injury and illness cases at pumice mines
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| No lost time, or an occupational illness | 1 |
What the accident reports at pumice mines describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Powered haulage | 1 |
Equipment named in accident reports at pumice mines
| Equipment | Reports |
|---|---|
| Ore haulage trucks - off highway trucks | 1 |
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.