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MSHA DATABASEMSHA records · 15 contributing sources · snapshot Oct 13, 2026
USS Holdings Inc→U S Silica Company→COLUMBIA PLANT

MINE DETAILS

COLUMBIA PLANT

ActiveSurfaceSand, Industrial NEC
MSHA MINE ID3800138
LOCATIONLexington, SC
PUBLIC RECORD2,895 linked rows

LOCATION

Mine location

1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.

Mine coordinates

2025-01-01 – 2026-10-13Applies to production, safety and portfolio metrics. Silica samples have separate filters.

2025 Q1 – 2026 Q4

JSONCSV

Database snapshot · 2026-10-13. MSHA quarterly production and employment reports.

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

167,718

reported employee hours

  1. 2025 Q127,022
  2. 2025 Q231,555
  3. 2025 Q330,583
  4. 2025 Q431,561
  5. 2026 Q124,284
  6. 2026 Q222,713
  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 COLUMBIA PLANT
QuarterCoal (short tons)Hours workedTons / hourAvg. employeesCoverage
2025 Q1027,0220.00651/1 mines reporting
2025 Q2031,5550.00641/1 mines reporting
2025 Q3030,5830.00551/1 mines reporting
2025 Q4031,5610.00561/1 mines reporting
2026 Q1024,2840.00481/1 mines reporting
2026 Q2022,7130.00511/1 mines reporting
2026 Q3————No report
2026 Q4————No report

Safety and enforcement

2025-01-01 – 2026-10-13

Violations

64

7 significant & substantial (S&S)

  1. 2025 Q118
  2. 2025 Q214
  3. 2025 Q33
  4. 2025 Q40
  5. 2026 Q110
  6. 2026 Q25
  7. 2026 Q314
  8. 2026 Q4 *0

Accident records

0

0 records classified as fatality

  1. 2025 Q10
  2. 2025 Q20
  3. 2025 Q30
  4. 2025 Q40
  5. 2026 Q10
  6. 2026 Q20
  7. 2026 Q30
  8. 2026 Q4 *0

Proposed penalties · USD

15,188.00

57 of 64 violations with amounts

  1. 2025 Q16,479
  2. 2025 Q22,535
  3. 2025 Q3453
  4. 2025 Q4—
  5. 2026 Q11,735
  6. 2026 Q21,166
  7. 2026 Q32,820
  8. 2026 Q4 *—

On-site inspection hours

256.50

31 inspections · 31 with hours

  1. 2025 Q155.50
  2. 2025 Q272.50
  3. 2025 Q335.50
  4. 2025 Q46.00
  5. 2026 Q139.75
  6. 2026 Q215.50
  7. 2026 Q331.75
  8. 2026 Q4 *0.00

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-Q11846,479.0000555.5
2025-Q21412,535.0000472.5
2025-Q330453.0000735.5
2025-Q400—0016.0
2026-Q11001,735.0000539.8
2026-Q2501,166.0000415.5
2026-Q31422,820.0000431.8
2026-Q4 *00—0010.0

Most cited CFR sections

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

SectionViolationsS&S
30 CFR 56.20003Housekeeping.92
30 CFR 56.14112Construction and maintenance of guards.70
30 CFR 56.11001Safe access.61
30 CFR 56.12004Electrical conductors.60
30 CFR 56.14107Moving machine parts.41
30 CFR 56.5001Exposure limits for airborne contaminants.40
30 CFR 56.11012Protection for openings around travelways.30
30 CFR 56.14100Safety defects; examination, correction and records.30
30 CFR 56.14130Roll-over protective structures (ROPS) and seat belts.30
30 CFR 47.41Requirement for container labels.20

Safety activity

  1. inspectionF044510

    Compliance Follow-up Inspection · 0.0 on-site hours

  2. inspectionF04450B

    Verbal Hazard Complaint Inspections · 2.3 on-site hours

  3. inspectionF04450C

    Spot Inspection · 2.0 on-site hours

  4. violation5193150

    56.20003(a) · S&S

  5. violation5193149

    56.20003(a)

  6. violation5193148

    56.12032

  7. violation5193147

    56.14112

  8. violation5063690

    56.12004 · $151.00 proposed

  9. violation5063689

    56.11001 · $151.00 proposed

  10. violation5063688

    56.12004 · $151.00 proposed

  11. inspectionF032501

    103 (g) Written Notification Hazard Complaint Inspectio · 0.0 on-site hours

  12. inspectionF032502

    Regular Safety and Health Inspection · 27.5 on-site hours

  13. violation5063687

    56.11001 · S&S · $755.00 proposed

  14. violation5063686

    56.14100(c) · $504.00 proposed

  15. violation5063685

    56.14107(a) · $151.00 proposed

  16. violation5063684

    56.12004 · $151.00 proposed

  17. violation5063683

    56.12004 · $151.00 proposed

  18. violation5063682

    56.11012 · $504.00 proposed

  19. violation5063681

    56.16006 · $151.00 proposed

  20. inspectionF036901

    Compliance Follow-up Inspection · 1.5 on-site hours

  21. inspectionF03C157

    Spot Inspection · 0.0 on-site hours

  22. violation5063310

    56.20003(a) · $151.00 proposed

  23. violation5063309

    56.20003(a) · $151.00 proposed

  24. violation5063313

    56.11001 · $288.00 proposed

  25. violation5063312

    56.14107(a) · $288.00 proposed

Safety sources and definitions

MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-13.

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.

OWNERSHIP

Operator and controller history

Current ownership comes from MSHA Mines. Historical start and end dates come from MSHA Controller and Operator History.

CURRENT HIERARCHYUSS Holdings Inc → U S Silica Company → COLUMBIA PLANT
HISTORY RECORDS39 relationships
INTERVAL CHECKPASScontroller/operator overlap
—

USS Holdings InccontrolsU S Silica CompanyoperatesCOLUMBIA PLANT

msha-controller-operator-history · controller/operator co-tenure derived on mine 3800138
—

Rio Tinto GroupcontrolsU S Silica CompanyoperatesCOLUMBIA PLANT

msha-controller-operator-history · controller/operator co-tenure derived on mine 3800138
—

ITT CorpcontrolsPennsylvania Glass Sand CorpoperatesCOLUMBIA PLANT

msha-controller-operator-history · controller/operator co-tenure derived on mine 3800138
Other historical summaries · source-specific periods

RECORD SUMMARY

Production, safety and enforcement

These summaries use the periods stated on each card, independently of the reporting period above.

01 / SAFETYwatch

Accidents and injuries

27 historical accident/injury rows; 0 coded fatalities and 516 lost days across the published record.

ACCIDENT + INJURY RECORD4 since 2021
accidentsmine-production-quarterly
02 / COMPLIANCEwatch

Violations and penalties

340 violation rows across the full record; 48 carry an S&S flag and $117,440 appears in current assessed amounts.

ENFORCEMENT ACTIVITY161 since 2021
inspectionsviolationsassessed-violationsorders-107a
03 / HEALTHwatch

Occupational health samples

159 personal. 14 personal-sample rows have a published C/E ratio above 1; 0 noise rows have an action-level or PEL dose above 100%. These are separate measures, not a silica exceedance count. Silica results and sample status are shown separately.

OCCUPATIONAL EXPOSURE159 samples
personal-health-samples
04 / PRODUCTIONcontext

Quarterly production and employment

23K employee hours and 51 summed average employees across reported subunits in the latest published quarter.

2026-Q20 tons
mine-production-quarterlymine-production-yearly
05 / LEGALwatch

Contests, conferences and decisions

32 contested-violation rows, 32 civil-penalty docket/decision rows, and 16 conference records linked by issuance number.

POST-ISSUANCE LIFECYCLE80 linked rows
conferencescontested-violationscivil-penalty-dockets-decisions
06 / CONTRACTORScontext

Contractors

Contractors are linked through this mine’s violation or accident records. Their production and hours cover all their operations, so they are not included in this mine’s totals.

ENTITY-LEVEL CONTEXT12 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations
07 / INSPECTIONScontext

Inspections

117 inspection events and 2K published inspection hours across the historical record.

OVERSIGHT COVERAGE50 since 2021
inspectionsviolations

HEALTH SAMPLING

Silica and quartz

Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 13, 2026. 55 silica records across the mine’s published history.

Matching records30 coal · 3 personal · 0 area
Sample status0 not voided0 voided · 3 status not reported
Personal samples with C/E > 103 published ratios · not a citation count

Personal silica samples · concentration / limit

Quarterly mean · published C/E ratio

  1. 2026-Q10.781 measurements
  2. 2026-Q2—0 measurements
  3. 2026-Q30.422 measurements
  4. 2026-Q4*—0 measurements

— No eligible measurements. * Quarter in progress. Means describe the available samples, not average exposure across the mine.

Quartz % is the sample’s quartz content; µg/m³ is its reported concentration. Personal C/E is the ratio to the limit published with that sample. Personal and area concentration units and void status are not specified in those source files.

2026 · Mar 13, 2026–Jul 27, 2026
Date / sampleDataset / analyteOccupation / areaMeasurementSample statusPublished action
000000202602999100Metal/nonmetal personalQuartz, respirable, >1% QtzMechanic0× published limitConcentration: 0000.30 · limit: 0000.00Source unit unspecifiedNot reportedNO ACTIONInspection F032502
000000202602998900Metal/nonmetal personalQuartz, respirable, >1% QtzLaborer, Bullgang0.83× published limitConcentration: 0000.19 · limit: 0000.23Source unit unspecifiedNot reportedNO ACTIONInspection F032502
000000202601061900Metal/nonmetal personalQuartz, respirable, >1% QtzTruck Loader0.78× published limitConcentration: 0000.14 · limit: 0000.18Source unit unspecifiedNot reportedNO ACTIONInspection F0324F4
Sources and interpretation
  • Coal means use numeric concentrations from samples marked not voided, excluding control/invalid sample types and dates after the snapshot. Missing values remain null; reported zeroes remain zero.
  • Quarterly means describe available samples, not mine-wide or worker-average exposure. Quarters with no eligible measurements remain empty; the current quarter is partial.
  • Personal C/E is MSHA's published concentration-to-limit ratio. A value above 1 is not by itself a citation or a determination under the 2024 silica rule. Personal and area files do not publish a void-status field.
  • Area records include bulk-dust analyses and are kept separate from personal exposure results. Their concentration units are not specified in the source dictionary.
  • Missing samples do not establish safe conditions. Coal quartz percentage and concentration are separate measures. No compliance threshold is inferred for coal samples.

Coal quartz field definitions ↗Metal/nonmetal personal field definitions ↗Metal/nonmetal area field definitions ↗

EIA + TITLE 30

EIA production and cited regulations

EIA annual figures are reported separately from MSHA. Regulation links use the current eCFR snapshot.

EIA MINE CONTEXTNo matched record
Not present in the 2024 EIA coal workbook.

This can mean the operation is non-coal, inactive for the annual period, or outside the EIA-7A reporting population.

RECENT PUBLIC RECORDS

Recent violations and samples

Latest records retained for inspection; aggregates above use the full source history.

VIOLATIONS12 latest shown
519315056.20003(a)S&S
519314956.20003(a)Citation
519314856.12032Citation
519314756.14112Citation
506369056.12004Citation
506368956.11001Citation
506368856.12004Citation
506368756.11001S&S
OTHER HEALTH SAMPLES8 latest shown

Coal dust, noise and other contaminants. Silica records above ↑

Respirable dust, <.1mgBagging Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgFlotation/Concentrator Oper.
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgBagging Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgBall Mill Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgBagging Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgBagging Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgBagging Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgScale Man
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified

SOURCE COVERAGE

Reporting dates and coverage

15 datasets contain linked records. Missing datasets are listed below.

DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors27Jul 15, 2000—Nov 12, 2022mine-keyed
Addresses of Recordidentity · logistics1Dec 18, 1978—Dec 18, 1978mine-keyed
Assessed Violationscompliance · legal332Jan 5, 2000—Jul 22, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal32Mar 23, 2005—Sep 4, 2025mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal16Jan 16, 2001—Dec 8, 2025mine-keyed
Contested Violationscompliance · legal32Oct 5, 2004—Sep 10, 2024mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety1,250Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety256Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance3Jan 1, 1950—Mar 9, 1996mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance262Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance67Not published—Not publishedmine-keyed
Inspectionssafety · compliance117Jan 5, 2000—Oct 5, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety—No published rowsabsent / not applicable
Metal and Nonmetal Personal Health Sampleshealth · safety159Mar 13, 2001—Jul 27, 2026mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal340Jan 5, 2000—Sep 17, 2026mine-keyed
107(a) Orders Issuedsafety · compliance—No published rowsabsent / not applicable

NOTES

Limitations

  • Contractor production is entity-level and is never represented as mine-attributable.
  • Missing rows can mean no event, publication delay, identity mismatch, or inapplicability.