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U.S. MINING ENTITIES / CONTROLLER / M11007

ACTIVE / CONTROLLER PORTFOLIO

USS Holdings Inc

Membership and operating status are from the latest MSHA Mines snapshot. Open a mine for its ownership history.

MSHA CONTROLLER IDM11007

MINE PORTFOLIO

27 of 27 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
Crane County Plant4105331 · Active5/8 quarters reportedCrane, TXSurface · MSHA: Sand, Industrial NEC0198,772333191.5
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
Lamesa Plant4105363 · Active6/8 quarters reportedDawson, TXSurface · MSHA: Construction Sand and Gravel0379,622283148.0
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
Sparta, WI Plant4703644 · Active6/8 quarters reportedMonroe, WISurface · MSHA: Sand, Industrial NEC0137,3763166.5

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

27 of 27 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 27 mines listed under this controller were checked; 27 have reports in the available quarters. Totals use current ownership.

Coal production

0

reported short tons

  1. 2025 Q10
  2. 2025 Q2 *0
  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

3,960,080

reported employee hours

  1. 2025 Q1675,271
  2. 2025 Q2 *653,766
  3. 2025 Q3700,270
  4. 2025 Q4650,097
  5. 2026 Q1642,437
  6. 2026 Q2638,239
  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 Q2 *0.00
  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 USS Holdings Inc
QuarterCoal (short tons)Hours workedTons / hourAvg. employeesCoverage
2025 Q10675,2710.001,31927/27 mines reporting
2025 Q20653,7660.001,21926/27 mines reporting
2025 Q30700,2700.001,27827/27 mines reporting
2025 Q40650,0970.001,24127/27 mines reporting
2026 Q10642,4370.001,22127/27 mines reporting
2026 Q20638,2390.001,20927/27 mines reporting
2026 Q3————No report
2026 Q4————No report

Safety and enforcement

2025-01-01 – 2026-10-18

Violations

351

45 significant & substantial (S&S)

  1. 2025 Q184
  2. 2025 Q228
  3. 2025 Q355
  4. 2025 Q443
  5. 2026 Q144
  6. 2026 Q258
  7. 2026 Q339
  8. 2026 Q4 *0

Accident records

26

0 records classified as fatality

  1. 2025 Q13
  2. 2025 Q22
  3. 2025 Q34
  4. 2025 Q45
  5. 2026 Q16
  6. 2026 Q23
  7. 2026 Q33
  8. 2026 Q4 *0

Proposed penalties · USD

143,717.00

336 of 351 violations with amounts

  1. 2025 Q131,107
  2. 2025 Q28,390
  3. 2025 Q331,281
  4. 2025 Q425,798
  5. 2026 Q111,597
  6. 2026 Q227,731
  7. 2026 Q37,813
  8. 2026 Q4 *—

On-site inspection hours

2,283.75

181 inspections · 181 with hours

  1. 2025 Q1434.75
  2. 2025 Q2356.25
  3. 2025 Q3283.25
  4. 2025 Q4276.50
  5. 2026 Q1348.25
  6. 2026 Q2317.00
  7. 2026 Q3260.75
  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-Q1841031,107.003032434.8
2025-Q22838,390.002023356.3
2025-Q355431,281.004026283.3
2025-Q443825,798.005023276.5
2026-Q144711,597.006024348.3
2026-Q258727,731.003025317.0
2026-Q33967,813.003026260.8
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.369
30 CFR 56.20003Housekeeping.278
30 CFR 56.14112Construction and maintenance of guards.240
30 CFR 56.12004Electrical conductors.220
30 CFR 56.11001Safe access.215
30 CFR 56.14107Moving machine parts.214
30 CFR 56.4201Inspection.150
30 CFR 47.41Requirement for container labels.100
30 CFR 56.12032Inspection and cover plates.100
30 CFR 50.30Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.90

Safety activity

  1. violation5007344
    Lamesa Plant · 4105363

    56.14100(c) · S&S · $3,736.00 proposed

  2. violation5007343
    Lamesa Plant · 4105363

    56.13021 · $151.00 proposed

  3. violation5007342
    Lamesa Plant · 4105363

    47.41(a) · $151.00 proposed

  4. violation5007341
    Lamesa Plant · 4105363

    56.14100(c) · $151.00 proposed

  5. violation5007340
    Lamesa Plant · 4105363

    46.3(a) · S&S · $5,144.00 proposed

  6. violation5007339
    Lamesa Plant · 4105363

    56.20003(a) · S&S · $5,144.00 proposed

  7. inspectionF026ECD
    Lamesa Plant · 4105363

    Spot Inspection · 0.8 on-site hours

  8. violation5007338
    Lamesa Plant · 4105363

    56.14207 · $151.00 proposed

  9. violation5007337
    Lamesa Plant · 4105363

    56.14132(a) · $151.00 proposed

  10. violation5007336
    Lamesa Plant · 4105363

    56.14132(a) · $151.00 proposed

  11. violation5007335
    Lamesa Plant · 4105363

    46.11(b)(4) · S&S · $2,569.00 proposed

  12. accident220260970020
    EP Engineered Clays Corporation · 2200415

    HANDLING OF MATERIALS · DAYS RESTRICTED ACTIVITY ONLY

    Accident narrative

    Employee fell forward hitting their face while moving vacuum hose up a concrete ramp.

  13. accident220261240004
    Lamesa Plant · 4105363

    SLIP OR FALL OF PERSON · INJURIES INVOLVNG NONEMPLOYEES

    Accident narrative

    It is believed that the customer truck driver fell from EE's trailer to the ground while stepping from the trailer to the safe rack. The fall resulted in multiple injuries requiring medical attention and a loss of work days.

  14. inspectionF026ECC
    Lamesa Plant · 4105363

    Non-Fatal Accident Investigation · 6.3 on-site hours

  15. inspectionF0324F6
    COLUMBIA PLANT · 3800138

    Compliance Follow-up Inspection · 1.5 on-site hours

  16. accident220260920020
    Colado Plant · 2600680

    SLIP OR FALL OF PERSON · DAYS RESTRICTED ACTIVITY ONLY

    Accident narrative

    Employee tripped over a 3-inch pipe that was staged for an outage outside of the maintenance shop. The employee fell to the ground and landed on EE's left upper torso, resulting in fractured ribs.

  17. violation9216801
    Montpelier Plant · 4402829

    56.12008 · $151.00 proposed

  18. violation5004296
    Mill Creek Plant #39 · 3400836

    56.6306(f)(1) · S&S · $1,037.00 proposed

  19. inspectionF0086AB
    Mill Creek Plant #39 · 3400836

    103 (g) Written Notification Hazard Complaint Inspectio · 4.0 on-site hours

  20. inspectionF02F013
    Montpelier Plant · 4402829

    Regular Safety and Health Inspection · 17.3 on-site hours

  21. violation9934245
    Berkeley Plant · 4602805

    56.5001(a)/56.5005 · $151.00 proposed

  22. violation5063668
    COLUMBIA PLANT · 3800138

    62.130(a) · $151.00 proposed

  23. violation5063667
    COLUMBIA PLANT · 3800138

    56.14112(a)(1) · $151.00 proposed

  24. violation5063666
    COLUMBIA PLANT · 3800138

    56.14112(a)(1) · $226.00 proposed

  25. inspectionF0324F4
    COLUMBIA PLANT · 3800138

    Regular Safety and Health Inspection · 29.0 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

2 linked operators.

Relationships reflect the selected mine status and current MSHA controller/operator fields.

OPERATOR / L14417U.S. Silica Company, LLC24 selected mines →OPERATOR / 0202753U.S. Silica Energy Company3 selected mines →