Coal production
0reported short tons
ACTIVE / OPERATOR PORTFOLIO
U.S. Silica Company, LLC
Membership and operating status are from the latest MSHA Mines snapshot. Open a mine for its ownership history.
MSHA OPERATOR IDL14417
MINE PORTFOLIO
24 of 24 mines and facilities
2025-01-01 – 2026-10-18. Active records; production reporting is not required.
Material, method and type filters apply to this table. The portfolio’s status applies to the entire page. GEM fields describe their own release, not the selected MSHA year.
| Mine | Location / type | Coal · short tons | Hours worked | Violations | Accident records | On-site inspection hours |
|---|---|---|---|---|---|---|
| Berkeley Plant4602805 · Active6/8 quarters reported | Morgan, WVSurface · MSHA: Ground Silica | 0 | 187,508 | 16 | 1 | 250.3 |
| Celatom Mine3503237 · Active6/8 quarters reported | Malheur, ORSurface · MSHA: Diatomaceous Earth (Diatomite) | 0 | 71,748 | 1 | 1 | 17.8 |
| Celatom Plant3503236 · Active6/8 quarters reported | Malheur, ORFacility · MSHA: Diatomaceous Earth (Diatomite) | 0 | 194,903 | 3 | 1 | 37.0 |
| Clark Operations2600677 · Active6/8 quarters reported | Storey, NVSurface · MSHA: Diatomaceous Earth (Diatomite) | 0 | 197,591 | 14 | 0 | 37.8 |
| Colado Mine2600672 · Active6/8 quarters reported | Pershing, NVSurface · MSHA: Diatomaceous Earth (Diatomite) | 0 | 88,634 | 4 | 1 | 32.5 |
| Colado Plant2600680 · Active6/8 quarters reported | Pershing, NVSurface · MSHA: Diatomaceous Earth (Diatomite) | 0 | 315,748 | 18 | 2 | 71.5 |
| COLUMBIA PLANT3800138 · Active6/8 quarters reported | Lexington, SCSurface · MSHA: Sand, Industrial NEC | 0 | 167,718 | 64 | 0 | 256.5 |
| Dubberly Plant1600489 · Active6/8 quarters reported | Webster, LASurface · MSHA: Construction Sand and Gravel | 0 | 51,116 | 4 | 0 | 50.5 |
| EP Engineered Clays Corporation2200415 · Active6/8 quarters reported | Hinds, MSFacility · MSHA: Clay, Ceramic, Refractory Mnls. | 0 | 257,894 | 11 | 2 | 69.0 |
| Fernley Operations2601950 · Active6/8 quarters reported | Churchill, NVSurface · MSHA: Diatomaceous Earth (Diatomite) | 0 | 95,292 | 9 | 0 | 48.8 |
| FOWLKES MINE2200460 · Active6/8 quarters reported | Monroe, MSSurface · MSHA: Bentonite | 0 | 2,456 | 1 | 0 | 40.0 |
| Hurtsboro Plant0100617 · Active6/8 quarters reported | Russell, ALSurface · MSHA: Construction Sand and Gravel | 0 | 33,470 | 5 | 0 | 45.5 |
| Jackson Plant4002937 · Active6/8 quarters reported | Madison, TNFacility · MSHA: Sand, Industrial NEC | 0 | 35,444 | 0 | 0 | 35.3 |
| Mapleton Depot Plant3603122 · Active6/8 quarters reported | Huntingdon, PASurface · MSHA: Sand, Industrial NEC | 0 | 162,554 | 8 | 2 | 136.5 |
| Mauricetown Plant2800526 · Active6/8 quarters reported | Cumberland, NJSurface · MSHA: Sand, Industrial NEC | 0 | 96,394 | 6 | 1 | 33.3 |
| Middleton Operations4002968 · Active6/8 quarters reported | Hardeman, TNSurface · MSHA: Common Clays NEC | 0 | 220,058 | 0 | 0 | 51.8 |
| Mill Creek Plant #373400377 · Active6/8 quarters reported | Johnston, OKSurface · MSHA: Sand, Industrial NEC | 0 | 79,653 | 4 | 0 | 29.3 |
| Mill Creek Plant #393400836 · Active6/8 quarters reported | Johnston, OKSurface · MSHA: Crushed, Broken Sandstone | 0 | 116,679 | 14 | 3 | 58.0 |
| Millen Plant0901232 · Active6/8 quarters reported | Jenkins, GAFacility · MSHA: Kaolin and Ball Clay | 0 | 95,835 | 1 | 0 | 37.8 |
| Montpelier Plant4402829 · Active6/8 quarters reported | Hanover, VASurface · MSHA: Aplite | 0 | 80,817 | 5 | 0 | 97.5 |
| Ottawa Plant1101013 · Active6/8 quarters reported | La Salle, ILSurface · MSHA: Ground Silica | 0 | 455,548 | 77 | 4 | 261.3 |
| Pacific Plant2300544 · Active6/8 quarters reported | St Louis, MOSurface · MSHA: Quartz, Ground | 0 | 174,132 | 11 | 1 | 86.3 |
| Port Elizabeth Plant2800510 · Active6/8 quarters reported | Cumberland, NJSurface · MSHA: Construction Sand and Gravel | 0 | 2,960 | 1 | 0 | 12.5 |
| Rockwood Plant2000608 · Active6/8 quarters reported | Wayne, MISurface · MSHA: Sand, Industrial NEC | 0 | 60,158 | 10 | 0 | 81.5 |
Production and hours sum available quarterly reports. — means unavailable; zero safety records means none in the selected imported period. Ownership reflects the current MSHA record.
LOCATION
Portfolio map
24 of 24 mines with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Berkeley Plant39.65778, -78.21000Open map ↗
- Celatom Mine43.77389, -117.97778Open map ↗
- Celatom Plant43.94639, -117.36556Open map ↗
- Clark Operations39.56417, -119.48083Open map ↗
- Colado Mine40.28278, -118.73111Open map ↗
- Colado Plant40.24444, -118.39111Open map ↗
- COLUMBIA PLANT33.88722, -81.16500Open map ↗
- Dubberly Plant32.53694, -93.24250Open map ↗
- EP Engineered Clays Corporation32.26833, -90.20778Open map ↗
- Fernley Operations39.82889, -118.97222Open map ↗
- FOWLKES MINE33.73889, -88.53278Open map ↗
- Hurtsboro Plant32.24785, -85.41665Open map ↗
- Jackson Plant35.59833, -88.88639Open map ↗
- Mapleton Depot Plant40.40806, -77.93556Open map ↗
- Mauricetown Plant39.28444, -75.00472Open map ↗
- Middleton Operations35.06444, -88.89083Open map ↗
- Mill Creek Plant #3734.39028, -96.80417Open map ↗
- Mill Creek Plant #3934.40417, -96.82639Open map ↗
- Millen Plant32.75556, -81.89944Open map ↗
- Montpelier Plant37.79056, -77.74500Open map ↗
- Ottawa Plant41.34667, -88.86500Open map ↗
- Pacific Plant38.48389, -90.72444Open map ↗
- Port Elizabeth Plant39.32583, -74.95944Open map ↗
- Rockwood Plant42.07083, -83.23472Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-18. All 24 mines listed under this operator were checked; 24 have reports in the available quarters. Totals use current ownership.
Hours worked
3,244,310reported employee hours
Tons per hour
0.00production ÷ hours worked
Missing values appear as —. Totals use available reports. Tons per hour requires production and hours for the same quarters and a nonzero hours total. * Striped bars mark partial mine coverage or an incomplete quarter. See the table for coverage.
Quarterly data and reporting coverage
| Quarter | Coal (short tons) | Hours worked | Tons / hour | Avg. employees | Coverage |
|---|---|---|---|---|---|
| 2025 Q1 | 0 | 571,336 | 0.00 | 1,097 | 24/24 mines reporting |
| 2025 Q2 | 0 | 566,900 | 0.00 | 1,071 | 24/24 mines reporting |
| 2025 Q3 | 0 | 568,630 | 0.00 | 1,056 | 24/24 mines reporting |
| 2025 Q4 | 0 | 522,500 | 0.00 | 1,025 | 24/24 mines reporting |
| 2026 Q1 | 0 | 512,251 | 0.00 | 999 | 24/24 mines reporting |
| 2026 Q2 | 0 | 502,693 | 0.00 | 984 | 24/24 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-18
Violations
28738 significant & substantial (S&S)
Accident records
190 records classified as fatality
Proposed penalties · USD
112,008.00275 of 287 violations with amounts
On-site inspection hours
1,877.75161 inspections · 161 with hours
Counts are published records, including contractor records. * The quarter was incomplete at the snapshot date; recent counts may rise as reports arrive. — means no reported amount or hours. Portfolio totals use current membership.
Quarterly safety data
| Quarter | Violations | S&S | Proposed USD | Accident records | Fatality records | Inspections | On-site hours |
|---|---|---|---|---|---|---|---|
| 2025-Q1 | 56 | 8 | 21,687.00 | 2 | 0 | 27 | 342.0 |
| 2025-Q2 | 26 | 3 | 8,239.00 | 2 | 0 | 21 | 286.5 |
| 2025-Q3 | 49 | 4 | 29,813.00 | 2 | 0 | 23 | 248.8 |
| 2025-Q4 | 43 | 8 | 25,798.00 | 3 | 0 | 23 | 276.5 |
| 2026-Q1 | 35 | 5 | 7,971.00 | 5 | 0 | 19 | 249.0 |
| 2026-Q2 | 43 | 4 | 11,291.00 | 2 | 0 | 22 | 261.3 |
| 2026-Q3 | 35 | 6 | 7,209.00 | 3 | 0 | 24 | 206.8 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 2 | 7.0 |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
- Colado Plant · 2600680
56.12004 · $151.00 proposed
- Colado Plant · 2600680
56.11012 · S&S · $3,736.00 proposed
- Berkeley Plant · 4602805
Impoundment Spot Inspection · 6.0 on-site hours
- Rockwood Plant · 2000608
47.44(b) · $151.00 proposed
- Mapleton Depot Plant · 3603122
56.12030 · $151.00 proposed
- Mapleton Depot Plant · 3603122
56.14100(b) · $151.00 proposed
- Rockwood Plant · 2000608
Regular Safety and Health Inspection · 16.5 on-site hours
- Rockwood Plant · 2000608
46.9(a) · $151.00 proposed
- Mapleton Depot Plant · 3603122
56.4201(a)(1) · $151.00 proposed
- Colado Plant · 2600680
Regular Safety and Health Inspection · 15.0 on-site hours
- Mapleton Depot Plant · 3603122
Regular Safety and Health Inspection · 28.3 on-site hours
- EP Engineered Clays Corporation · 2200415
Compliance Follow-up Inspection · 3.0 on-site hours
- Port Elizabeth Plant · 2800510
Regular Safety and Health Inspection · 2.0 on-site hours
- Mauricetown Plant · 2800526
56.14112(a)(1) · $151.00 proposed
- Mauricetown Plant · 2800526
Regular Safety and Health Inspection · 9.5 on-site hours
- Pacific Plant · 2300544
56.14112(b) · $151.00 proposed
- Pacific Plant · 2300544
56.11001 · $151.00 proposed
- Pacific Plant · 2300544
Regular Safety and Health Inspection · 25.5 on-site hours
- COLUMBIA PLANT · 3800138
103 (g) Written Notification Hazard Complaint Inspectio · 6.0 on-site hours
- Celatom Plant · 3503236
Regular Safety and Health Inspection · 15.8 on-site hours
- Celatom Plant · 3503236
56.14205 · $151.00 proposed
- Dubberly Plant · 1600489
Regular Safety and Health Inspection · 19.0 on-site hours
- Celatom Mine · 3503237
Regular Safety and Health Inspection · 5.0 on-site hours
- Jackson Plant · 4002937
Verbal Hazard Complaint Inspections · 3.0 on-site hours
- Jackson Plant · 4002937
Regular Safety and Health Inspection · 7.5 on-site hours
Safety sources and definitions
MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-18.
Counts describe published rows, including contractor records; accident records are not distinct incidents or numbers of people injured.
Zero means no matching records in the imported sources, not proof of no events. Historical coverage differs by source; absence before a source begins reporting is not a zero incident rate. Invalid or absent dates and records after the snapshot are excluded.
S&S means SIG_SUB=Y. Fatality records use DEGREE_INJURY_CD=01. Proposed penalties are not final assessed or paid amounts; missing dollar values are omitted.
Inspection hours are SUM_TOTAL_ON_SITE_HOURS attributed to the inspection start date, without supervisor/trainee hours. Missing hours are omitted; a started inspection may still be open.
Portfolio totals use current mine membership, including events before the current owner or operator's tenure.
CFR headings link to the current Title 30 index; they are not historical legal determinations.
SELECTED PORTFOLIO
1 linked controller.
Relationships reflect the selected mine status and current MSHA controller/operator fields.