MINE DETAILS
Lemont Underground Limestone
MSHA MINE ID1103111
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Lemont Underground Limestone41.66806, -88.05722Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-13. MSHA quarterly production and employment reports.
Coal production
0reported short tons
Hours worked
101,511reported 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 | 7,777 | 0.00 | 25 | 1/1 mines reporting |
| 2025 Q2 | 0 | 22,940 | 0.00 | 34 | 1/1 mines reporting |
| 2025 Q3 | 0 | 18,160 | 0.00 | 25 | 1/1 mines reporting |
| 2025 Q4 | 0 | 19,662 | 0.00 | 32 | 1/1 mines reporting |
| 2026 Q1 | 0 | 18,308 | 0.00 | 34 | 1/1 mines reporting |
| 2026 Q2 | 0 | 14,664 | 0.00 | 25 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
111 significant & substantial (S&S)
Accident records
10 records classified as fatality
Proposed penalties · USD
3,136.0011 of 11 violations with amounts
On-site inspection hours
156.507 inspections · 7 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 | 4 | 0 | 656.00 | 0 | 0 | 1 | 16.0 |
| 2025-Q2 | 1 | 0 | 267.00 | 0 | 0 | 1 | 24.8 |
| 2025-Q3 | 2 | 1 | 906.00 | 0 | 0 | 1 | 21.0 |
| 2025-Q4 | 1 | 0 | 226.00 | 0 | 0 | 1 | 25.5 |
| 2026-Q1 | 2 | 0 | 930.00 | 0 | 0 | 1 | 25.0 |
| 2026-Q2 | 1 | 0 | 151.00 | 0 | 0 | 1 | 24.5 |
| 2026-Q3 | 0 | 0 | — | 1 | 0 | 1 | 19.8 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
Regular Safety and Health Inspection · 19.8 on-site hours
INUNDATION · ACCIDENT ONLY
Accident narrative
Violent storms over the weekend knocked down a tree, which in turn knocked down a power line causing the power to go out at the plant and to the pumps. Heavy rains in excess of 6 inches caused flooding. The heavy rain washed out berms and excessive water running down the decline into the mine. MSHA was notified about the flooding.
57.4104(b)(1) · $151.00 proposed
Regular Safety and Health Inspection · 24.5 on-site hours
57.20003(a) · $288.00 proposed
57.12020 · $642.00 proposed
Regular Safety and Health Inspection · 25.0 on-site hours
57.14130(c) · $226.00 proposed
Regular Safety and Health Inspection · 25.5 on-site hours
57.4101 · $151.00 proposed
Regular Safety and Health Inspection · 21.0 on-site hours
57.14207 · S&S · $755.00 proposed
57.12032 · $267.00 proposed
Regular Safety and Health Inspection · 24.8 on-site hours
57.4201(a)(2) · $151.00 proposed
57.12028 · $177.00 proposed
57.9300(b) · $177.00 proposed
47.44(b) · $151.00 proposed
Regular Safety and Health Inspection · 16.0 on-site hours
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.
—
Vulcan Materials CompanycontrolsVulcan Construction Materials, LLCoperatesLemont Underground Limestone
msha-controller-operator-history · controller/operator co-tenure derived on mine 1103111—
Legacy Vulcan Corp (Form:Vulcan Materials Co)controlsVulcan Construction Materials, LLCoperatesLemont Underground Limestone
msha-controller-operator-history · controller/operator co-tenure derived on mine 1103111Other 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
14 historical accident/injury rows; 0 coded fatalities and 889 lost days across the published record.
ACCIDENT + INJURY RECORD2 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
227 violation rows across the full record; 29 carry an S&S flag and $48,054 appears in current assessed amounts.
ENFORCEMENT ACTIVITY99 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
237 personal; 19 area. 11 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 EXPOSURE256 samples
personal-health-samplesarea-samples04 / PRODUCTIONcontext
Quarterly production and employment
15K employee hours and 25 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
10 contested-violation rows, 10 civil-penalty docket/decision rows, and 11 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE31 linked rows
conferencescontested-violationscivil-penalty-dockets-decisions06 / 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 CONTEXT9 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
118 inspection events and 4K published inspection hours across the historical record.
OVERSIGHT COVERAGE35 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 13, 2026. 4 silica records across the mine’s published history.
Personal silica samples · concentration / limit
Quarterly mean · published C/E ratio
— 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.
| Date / sample | Dataset / analyte | Occupation / area | Measurement | Sample status | Published action |
|---|---|---|---|---|---|
| No silica records match these filters. Missing samples do not establish safe conditions. | |||||
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.
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.
30 CFR 57.4104Combustible waste.1 recent row ↗30 CFR 57.20003Housekeeping.1 recent row ↗30 CFR 57.12020Protection of persons at switchgear.1 recent row ↗30 CFR 57.14130Roll-over protective structures (ROPS) and seat belts for surface equipment.1 recent row ↗30 CFR 57.4101Warning signs.1 recent row ↗30 CFR 57.14207Parking procedures for unattended equipment.1 recent row ↗30 CFR 57.12032Inspection and cover plates.1 recent row ↗30 CFR 57.4201Inspection.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
511862657.4104(b)(1)Citation
511860957.20003(a)Citation
511860857.12020Citation
511860357.14130(c)Citation
873618057.4101Citation
873617957.14207S&S
873615157.12032Citation
873613457.4201(a)(2)Citation
Coal dust, noise and other contaminants. Silica records above ↑
Nuisance dust, respirable, <1% QtzRoof Bolter, Rock
C/E: 00.02Concentration: 0000.21 · limit: 0010.00Source unit unspecified
Nuisance dust, respirable, <1% QtzBlaster, Powder Gang
C/E: 00.04Concentration: 0000.38 · limit: 0010.00Source unit unspecified
TC from EC @ 160Drill Operator, Rotary
C/E: 00.00Concentration: 0000.00 · limit: 0160.00Source unit unspecified
TC @ 160Drill Operator, Rotary
C/E: 00.59Concentration: 0094.00 · limit: 0160.00Source unit unspecified
ORGANIC CARBONDrill Operator, Rotary
C/E: 00.00Concentration: 0038.00 · limit: 0000.00Source unit unspecified
EC @ 160Drill Operator, Rotary
C/E: 00.34Concentration: 0054.00 · limit: 0160.00Source unit unspecified
TC from EC @ 160Blaster, Powder Gang
C/E: 00.00Concentration: 0000.00 · limit: 0160.00Source unit unspecified
TC @ 160Blaster, Powder Gang
C/E: 00.90Concentration: 0144.00 · limit: 0160.00Source unit unspecified
SOURCE COVERAGE
Reporting dates and coverage
16 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors14Jul 16, 2004—Jul 6, 2026mine-keyed
Addresses of Recordidentity · logistics1Nov 19, 2013—Nov 19, 2013mine-keyed
Assessed Violationscompliance · legal226Feb 25, 2003—May 19, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal10Oct 30, 2009—Jun 13, 2024mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal11Dec 15, 2005—Jul 27, 2026mine-keyed
Contested Violationscompliance · legal10Jun 13, 2007—Apr 13, 2023mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety1,361Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety284Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance2Dec 18, 2002—Dec 18, 2002mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance312Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance74Not published—Not publishedmine-keyed
Inspectionssafety · compliance118Feb 25, 2003—Aug 3, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety19Aug 7, 2019—Dec 6, 2023mine-keyed
Metal and Nonmetal Personal Health Sampleshealth · safety237Feb 26, 2003—Nov 19, 2025mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal227Feb 25, 2003—May 19, 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.