Data / Mines / U.S. Silica Company, LLC
U.S. Silica Company, LLC: 27 open mines, 942 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
U.S. Silica Company, LLC (MSHA operator ID L14417) operates 27 open mines with 1,150 employees in Nevada, Mississippi, New Jersey and other states, mostly sand, industrial. Since January 1, 2022 MSHA inspectors issued it 942 citations and orders with $414,119 in proposed penalties, and it reported 70 injury or illness cases. Data from MSHA, November 6, 2026.
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- MSHA operator ID
- L14417
- Open mines
- 27
- Employees at open mines
- 1,150
- States
- Nevada, Mississippi, New Jersey, Oklahoma, Oregon, Tennessee, Alabama, Arizona
- Parent company
- Uss Holdings Inc
- Citations and orders since January 1, 2022
- 942
- Significant and substantial
- 139 (14.8%)
- Closure orders
- 10
- High negligence or reckless
- 47
- Proposed penalties
- $414,119
- Amount paid so far
- $383,295
- Inspections
- 459
- Inspector hours on site
- 6,031
- Citations per inspection
- 2.05 (all mines 2.30)
- Accident reports
- 77
- Injury and illness cases
- 70
- Fatalities
- 0
- Latest MSHA record
- November 4, 2026
Open mines of U.S. Silica Company, LLC
Ranked by citations since January 1, 2022.
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Ottawa Plant | U.S. Silica Company, LLC | La Salle County, IL | Ground silica | 124 | 209 |
| Columbia Plant | U.S. Silica Company, LLC | Lexington County, SC | Sand, industrial | 55 | 124 |
| Pacific Plant | U.S. Silica Company, LLC | St Louis County, MO | Quartz, ground | 41 | 109 |
| Colado Plant | U.S. Silica Company, LLC | Pershing County, NV | Diatomaceous earth (diatomite) | 140 | 42 |
| Ep Engineered Clays Corporation | U.S. Silica Company, LLC | Hinds County, MS | Clay, ceramic, refractory mnls. | 122 | 37 |
| Clark Operations | U.S. Silica Company, LLC | Storey County, NV | Diatomaceous earth (diatomite) | 62 | 37 |
| Rockwood Plant | U.S. Silica Company, LLC | Wayne County, MI | Sand, industrial | 12 | 34 |
| Mapleton Depot Plant | U.S. Silica Company, LLC | Huntingdon County, PA | Sand, industrial | 42 | 27 |
| Middleton Operations | U.S. Silica Company, LLC | Hardeman County, TN | Common clays | 90 | 25 |
| Mill Creek Plant #39 | U.S. Silica Company, LLC | Johnston County, OK | Crushed, broken sandstone | 49 | 24 |
| Berkeley Plant | U.S. Silica Company, LLC | Morgan County, WV | Ground silica | 68 | 21 |
| Mauricetown Plant | U.S. Silica Company, LLC | Cumberland County, NJ | Sand, industrial | 33 | 19 |
| Fernley Operations | U.S. Silica Company, LLC | Churchill County, NV | Diatomaceous earth (diatomite) | 57 | 17 |
| Celatom Plant | U.S. Silica Company, LLC | Malheur County, OR | Diatomaceous earth (diatomite) | 53 | 17 |
| Colado Mine | U.S. Silica Company, LLC | Pershing County, NV | Diatomaceous earth (diatomite) | 36 | 14 |
| Hurtsboro Plant | U.S. Silica Company, LLC | Russell County, AL | Construction sand and gravel | 9 | 14 |
| Mill Creek Plant #37 | U.S. Silica Company, LLC | Johnston County, OK | Sand, industrial | 23 | 8 |
| Dubberly Plant | U.S. Silica Company, LLC | Webster Parish, LA | Construction sand and gravel | 15 | 6 |
| Montpelier Plant | U.S. Silica Company, LLC | Hanover County, VA | Aplite | 26 | 5 |
| Celatom Mine | U.S. Silica Company, LLC | Malheur County, OR | Diatomaceous earth (diatomite) | 17 | 2 |
| Port Elizabeth Plant | U.S. Silica Company, LLC | Cumberland County, NJ | Construction sand and gravel | 1 | 2 |
| Millen Plant | U.S. Silica Company, LLC | Jenkins County, GA | Kaolin and ball clay | 28 | 1 |
| Fowlkes Mine | U.S. Silica Company, LLC | Monroe County, MS | Bentonite | 22 | 0 |
| Jackson Plant | U.S. Silica Company, LLC | Madison County, TN | Sand, industrial | 17 | 0 |
| Pop-Corn | U.S. Silica Company, LLC | Churchill County, NV | Perlite | 5 | 0 |
| Hazen Pit | U.S. Silica Company, LLC | Churchill County, NV | Misc. nonmetallic mnls. | 3 | 0 |
| Cheto Mine | U.S. Silica Company, LLC | Apache County, AZ | Common clays | 0 | 0 |
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 | 190 | 35 | $94,822 | 19 |
| 2023 | 232 | 33 | $97,402 | 14 |
| 2024 | 232 | 37 | $105,816 | 18 |
| 2025 | 180 | 20 | $90,500 | 8 |
| 2026 | 108 | 14 | $25,579 | 11 |
Standards cited most at U.S. Silica Company, LLC
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 56.20003 | Surface metal and nonmetal mines | 78 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 62 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 61 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 58 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 56 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 50 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 41 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 33 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 27 |
| 30 CFR 47.41 | Hazard communication | 21 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 20 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 20 |
| 30 CFR 56.12030 | Surface metal and nonmetal mines | 19 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 19 |
| 30 CFR 56.5001 | Surface metal and nonmetal mines | 18 |
Injury and illness cases at U.S. Silica Company, LLC
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Permanent disability | 4 |
| Days away from work or restricted activity | 42 |
| No lost time, or an occupational illness | 24 |
What the accident reports at U.S. Silica Company, LLC describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 23 |
| Slip or fall of person | 18 |
| Machinery | 11 |
| Powered haulage | 6 |
| Handtools (nonpowered) | 5 |
| Other | 4 |
| Fire | 3 |
| Hoisting | 1 |
| Stepping or kneeling on object | 1 |
| Impoundment | 1 |
Equipment named in accident reports at U.S. Silica Company, LLC
| Equipment | Reports |
|---|---|
| Hand tools (powered) | 7 |
| Ore haulage trucks - off highway trucks | 5 |
| Hand tools (not powered) | 5 |
| Front-end loader | 4 |
| Packaging machine | 2 |
| Mine car | 2 |
| Forklift | 2 |
| Road grader | 2 |
| Shovel | 1 |
| Conveyor | 1 |
Commodities
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.