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U.S. MINING ENTITIES / OPERATOR / L14417

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.

MineLocation / typeCoal · short tonsHours workedViolationsAccident recordsOn-site inspection hours
Berkeley Plant4602805 · Active6/8 quarters reportedMorgan, WVSurface · MSHA: Ground Silica0187,508161250.3
Celatom Mine3503237 · Active6/8 quarters reportedMalheur, ORSurface · MSHA: Diatomaceous Earth (Diatomite)071,7481117.8
Celatom Plant3503236 · Active6/8 quarters reportedMalheur, ORFacility · MSHA: Diatomaceous Earth (Diatomite)0194,9033137.0
Clark Operations2600677 · Active6/8 quarters reportedStorey, NVSurface · MSHA: Diatomaceous Earth (Diatomite)0197,59114037.8
Colado Mine2600672 · Active6/8 quarters reportedPershing, NVSurface · MSHA: Diatomaceous Earth (Diatomite)088,6344132.5
Colado Plant2600680 · Active6/8 quarters reportedPershing, NVSurface · MSHA: Diatomaceous Earth (Diatomite)0315,74818271.5
COLUMBIA PLANT3800138 · Active6/8 quarters reportedLexington, SCSurface · MSHA: Sand, Industrial NEC0167,718640256.5
Dubberly Plant1600489 · Active6/8 quarters reportedWebster, LASurface · MSHA: Construction Sand and Gravel051,1164050.5
EP Engineered Clays Corporation2200415 · Active6/8 quarters reportedHinds, MSFacility · MSHA: Clay, Ceramic, Refractory Mnls.0257,89411269.0
Fernley Operations2601950 · Active6/8 quarters reportedChurchill, NVSurface · MSHA: Diatomaceous Earth (Diatomite)095,2929048.8
FOWLKES MINE2200460 · Active6/8 quarters reportedMonroe, MSSurface · MSHA: Bentonite02,4561040.0
Hurtsboro Plant0100617 · Active6/8 quarters reportedRussell, ALSurface · MSHA: Construction Sand and Gravel033,4705045.5
Jackson Plant4002937 · Active6/8 quarters reportedMadison, TNFacility · MSHA: Sand, Industrial NEC035,4440035.3
Mapleton Depot Plant3603122 · Active6/8 quarters reportedHuntingdon, PASurface · MSHA: Sand, Industrial NEC0162,55482136.5
Mauricetown Plant2800526 · Active6/8 quarters reportedCumberland, NJSurface · MSHA: Sand, Industrial NEC096,3946133.3
Middleton Operations4002968 · Active6/8 quarters reportedHardeman, TNSurface · MSHA: Common Clays NEC0220,0580051.8
Mill Creek Plant #373400377 · Active6/8 quarters reportedJohnston, OKSurface · MSHA: Sand, Industrial NEC079,6534029.3
Mill Creek Plant #393400836 · Active6/8 quarters reportedJohnston, OKSurface · MSHA: Crushed, Broken Sandstone0116,67914358.0
Millen Plant0901232 · Active6/8 quarters reportedJenkins, GAFacility · MSHA: Kaolin and Ball Clay095,8351037.8
Montpelier Plant4402829 · Active6/8 quarters reportedHanover, VASurface · MSHA: Aplite080,8175097.5
Ottawa Plant1101013 · Active6/8 quarters reportedLa Salle, ILSurface · MSHA: Ground Silica0455,548774261.3
Pacific Plant2300544 · Active6/8 quarters reportedSt Louis, MOSurface · MSHA: Quartz, Ground0174,13211186.3
Port Elizabeth Plant2800510 · Active6/8 quarters reportedCumberland, NJSurface · MSHA: Construction Sand and Gravel02,9601012.5
Rockwood Plant2000608 · Active6/8 quarters reportedWayne, MISurface · MSHA: Sand, Industrial NEC060,15810081.5

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

2025-01-01 – 2026-10-18Applies to production, safety and portfolio metrics. Silica samples have separate filters.

2025 Q1 – 2026 Q4

JSONCSV

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.

Coal production

0

reported short tons

  1. 2025 Q10
  2. 2025 Q20
  3. 2025 Q30
  4. 2025 Q40
  5. 2026 Q10
  6. 2026 Q20
  7. 2026 Q3—No usable value reported
  8. 2026 Q4 *—No usable value reported

Hours worked

3,244,310

reported employee hours

  1. 2025 Q1571,336
  2. 2025 Q2566,900
  3. 2025 Q3568,630
  4. 2025 Q4522,500
  5. 2026 Q1512,251
  6. 2026 Q2502,693
  7. 2026 Q3—No usable value reported
  8. 2026 Q4 *—No usable value reported

Tons per hour

0.00

production ÷ hours worked

  1. 2025 Q10.00
  2. 2025 Q20.00
  3. 2025 Q30.00
  4. 2025 Q40.00
  5. 2026 Q10.00
  6. 2026 Q20.00
  7. 2026 Q3—No usable value reported
  8. 2026 Q4 *—No usable value reported

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
Quarterly production, employment and reporting coverage for U.S. Silica Company, LLC
QuarterCoal (short tons)Hours workedTons / hourAvg. employeesCoverage
2025 Q10571,3360.001,09724/24 mines reporting
2025 Q20566,9000.001,07124/24 mines reporting
2025 Q30568,6300.001,05624/24 mines reporting
2025 Q40522,5000.001,02524/24 mines reporting
2026 Q10512,2510.0099924/24 mines reporting
2026 Q20502,6930.0098424/24 mines reporting
2026 Q3————No report
2026 Q4————No report

Safety and enforcement

2025-01-01 – 2026-10-18

Violations

287

38 significant & substantial (S&S)

  1. 2025 Q156
  2. 2025 Q226
  3. 2025 Q349
  4. 2025 Q443
  5. 2026 Q135
  6. 2026 Q243
  7. 2026 Q335
  8. 2026 Q4 *0

Accident records

19

0 records classified as fatality

  1. 2025 Q12
  2. 2025 Q22
  3. 2025 Q32
  4. 2025 Q43
  5. 2026 Q15
  6. 2026 Q22
  7. 2026 Q33
  8. 2026 Q4 *0

Proposed penalties · USD

112,008.00

275 of 287 violations with amounts

  1. 2025 Q121,687
  2. 2025 Q28,239
  3. 2025 Q329,813
  4. 2025 Q425,798
  5. 2026 Q17,971
  6. 2026 Q211,291
  7. 2026 Q37,209
  8. 2026 Q4 *—

On-site inspection hours

1,877.75

161 inspections · 161 with hours

  1. 2025 Q1342.00
  2. 2025 Q2286.50
  3. 2025 Q3248.75
  4. 2025 Q4276.50
  5. 2026 Q1249.00
  6. 2026 Q2261.25
  7. 2026 Q3206.75
  8. 2026 Q4 *7.00

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
QuarterViolationsS&SProposed USDAccident recordsFatality recordsInspectionsOn-site hours
2025-Q156821,687.002027342.0
2025-Q22638,239.002021286.5
2025-Q349429,813.002023248.8
2025-Q443825,798.003023276.5
2026-Q13557,971.005019249.0
2026-Q243411,291.002022261.3
2026-Q33567,209.003024206.8
2026-Q4 *00—0027.0

Most cited CFR sections

All violations issued in the selected period. Counts combine subsections.

SectionViolationsS&S
30 CFR 56.14100Safety defects; examination, correction and records.318
30 CFR 56.11001Safe access.205
30 CFR 56.12004Electrical conductors.190
30 CFR 56.14112Construction and maintenance of guards.190
30 CFR 56.20003Housekeeping.195
30 CFR 56.14107Moving machine parts.144
30 CFR 56.4201Inspection.130
30 CFR 56.12032Inspection and cover plates.90
30 CFR 50.30Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.80
30 CFR 56.11012Protection for openings around travelways.82

Safety activity

  1. violation5042354
    Pacific Plant · 2300544

    56.13011 · $151.00 proposed

  2. accident220261550010
    Colado Plant · 2600680

    MACHINERY · DAYS RESTRICTED ACTIVITY ONLY

    Accident narrative

    An employee was cutting bolts with a grinder when the tool unexpectedly kicked back, causing the grinding wheel to contact the employee's left wrist. The employee sustained a laceration requiring seven stitches.

  3. inspectionF03861C
    Pacific Plant · 2300544

    Regular Safety and Health Inspection · 16.5 on-site hours

  4. inspectionF03B2E8
    Celatom Plant · 3503236

    Regular Safety and Health Inspection · 12.0 on-site hours

  5. violation5042353
    Pacific Plant · 2300544

    56.11001 · $193.00 proposed

  6. violation5042352
    Pacific Plant · 2300544

    56.17001 · $151.00 proposed

  7. violation5042351
    Pacific Plant · 2300544

    56.9300(b) · S&S · $288.00 proposed

  8. violation5042350
    Pacific Plant · 2300544

    56.9300(b) · S&S · $288.00 proposed

  9. violation5101272
    Celatom Plant · 3503236

    56.12028 · $151.00 proposed

  10. violation5101271
    Celatom Plant · 3503236

    56.14100(c) · S&S · $151.00 proposed

  11. inspectionF006A03
    Mapleton Depot Plant · 3603122

    Regular Safety and Health Inspection · 31.3 on-site hours

  12. violation9602381
    Mapleton Depot Plant · 3603122

    56.14100(b) · $151.00 proposed

  13. accident220261470002
    EP Engineered Clays Corporation · 2200415

    HANDLING OF MATERIALS · DAYS RESTRICTED ACTIVITY ONLY

    Accident narrative

    The employee attempted to reconnect a hose when material splashed into EE's left eye. The employee received antibiotic medication to prevent infection

  14. inspectionF036901
    COLUMBIA PLANT · 3800138

    Compliance Follow-up Inspection · 1.5 on-site hours

  15. inspectionF043201
    Hurtsboro Plant · 0100617

    Compliance Follow-up Inspection · 4.0 on-site hours

  16. inspectionF03C157
    COLUMBIA PLANT · 3800138

    Spot Inspection · 0.0 on-site hours

  17. violation5063310
    COLUMBIA PLANT · 3800138

    56.20003(a) · $151.00 proposed

  18. violation5063309
    COLUMBIA PLANT · 3800138

    56.20003(a) · $151.00 proposed

  19. violation5063313
    COLUMBIA PLANT · 3800138

    56.11001 · $288.00 proposed

  20. violation5063312
    COLUMBIA PLANT · 3800138

    56.14107(a) · $288.00 proposed

  21. violation5063311
    COLUMBIA PLANT · 3800138

    56.14107(a) · $288.00 proposed

  22. inspectionF01C82A
    Colado Mine · 2600672

    Regular Safety and Health Inspection · 3.0 on-site hours

  23. inspectionF03C156
    COLUMBIA PLANT · 3800138

    103 (g) Written Notification Hazard Complaint Inspectio · 5.0 on-site hours

  24. violation9349186
    Colado Plant · 2600680

    56.14206(b) · $151.00 proposed

  25. inspectionF01C828
    Colado Plant · 2600680

    Regular Safety and Health Inspection · 7.0 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.

CONTROLLER / M11007USS Holdings Inc24 selected mines →