MINE DETAILS
MLC - Bonne Terre
MSHA MINE ID2302371
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- MLC - Bonne Terre37.88889, -90.53306Open 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
124,215reported 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 | 20,696 | 0.00 | 40 | 1/1 mines reporting |
| 2025 Q2 | 0 | 17,677 | 0.00 | 40 | 1/1 mines reporting |
| 2025 Q3 | 0 | 19,935 | 0.00 | 40 | 1/1 mines reporting |
| 2025 Q4 | 0 | 21,168 | 0.00 | 40 | 1/1 mines reporting |
| 2026 Q1 | 0 | 23,998 | 0.00 | 49 | 1/1 mines reporting |
| 2026 Q2 | 0 | 20,741 | 0.00 | 49 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
6111 significant & substantial (S&S)
Accident records
31 records classified as fatality
Proposed penalties · USD
49,310.0037 of 61 violations with amounts
On-site inspection hours
389.008 inspections · 8 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 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2025-Q2 | 6 | 1 | 1,022.00 | 1 | 0 | 1 | 37.8 |
| 2025-Q3 | 0 | 0 | — | 0 | 0 | 1 | 5.5 |
| 2025-Q4 | 4 | 0 | 453.00 | 2 | 1 | 2 | 228.3 |
| 2026-Q1 | 3 | 3 | 43,671.00 | 0 | 0 | 0 | — |
| 2026-Q2 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2026-Q3 | 33 | 7 | 4,164.00 | 0 | 0 | 3 | 117.5 |
| 2026-Q4 * | 15 | 0 | — | 0 | 0 | 1 | 0.0 |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
48.28(a)
56.12025
48.25
56.14100(c)
56.20013
56.14100(c)
56.14207
56.19057
56.4101
56.14207
56.4200(b)(2)
46.9(b)(2)
56.12004
56.14207
46.8(a)(1)
Regular Safety and Health Inspection · 0.0 on-site hours
Compliance Follow-up Inspection · 3.5 on-site hours
Verbal Hazard Complaint Inspections · 4.0 on-site hours
56.4200(a)(1) · S&S · $151.00 proposed
56.4101 · S&S · $151.00 proposed
56.20003(a) · S&S · $267.00 proposed
56.20003(a) · $151.00 proposed
56.12018 · $151.00 proposed
56.12020 · $151.00 proposed
56.15007 · S&S
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.
—
HBM Holdings CompanycontrolsMLCoperatesMLC - Bonne Terre
msha-controller-operator-history · controller/operator co-tenure derived on mine 2302371—
Margaret J Heckman et alcontrolsMLCoperatesMLC - Bonne Terre
msha-controller-operator-history · controller/operator co-tenure derived on mine 2302371—
Thomas HillmancontrolsValley Minerals, LLCoperatesMLC - Bonne Terre
msha-controller-operator-history · controller/operator co-tenure derived on mine 2302371—
Paul Melnuk et alcontrolsValley Minerals, LLCoperatesMLC - Bonne Terre
msha-controller-operator-history · controller/operator co-tenure derived on mine 2302371—
Tom Hillman et alcontrolsValley Minerals, LLCoperatesMLC - Bonne Terre
msha-controller-operator-history · controller/operator co-tenure derived on mine 2302371—
Jomico LLCcontrolsMissouri Lime LLCoperatesMLC - Bonne Terre
msha-controller-operator-history · controller/operator co-tenure derived on mine 2302371Other 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
40 historical accident/injury rows; 2 coded fatalities and 210 lost days across the published record.
ACCIDENT + INJURY RECORD5 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
420 violation rows across the full record; 156 carry an S&S flag and $566,209 appears in current assessed amounts.
ENFORCEMENT ACTIVITY85 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
41 personal. 2 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 EXPOSURE41 samples
personal-health-samples04 / PRODUCTIONcontext
Quarterly production and employment
21K employee hours and 49 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
37 contested-violation rows, 35 civil-penalty docket/decision rows, and 18 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE90 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 CONTEXT15 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
101 inspection events and 2K published inspection hours across the historical record.
OVERSIGHT COVERAGE22 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 |
|---|---|---|---|---|---|
| 000000202602761800 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Laborer, Bullgang | 0× published limitConcentration: 0000.70 · limit: 0000.00Source unit unspecified | Not reported | NO ACTIONInspection F027E4C |
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 48.28Annual refresher training of miners; minimum courses of instruction; hours of instruction.1 recent row ↗30 CFR 56.12025Grounding circuit enclosures.1 recent row ↗30 CFR 48.25Training of new miners; minimum courses of instruction; hours of instruction.1 recent row ↗30 CFR 56.14100Safety defects; examination, correction and records.2 recent rows ↗30 CFR 56.20013Waste receptacles.1 recent row ↗30 CFR 56.14207Parking procedures for unattended equipment.2 recent rows ↗30 CFR 56.19057Hoist operator's physical fitness.1 recent row ↗30 CFR 56.4101Warning signs.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
522340548.28(a)Order
504316256.12025Citation
504316148.25Order
522340456.14100(c)Citation
522340356.20013Citation
522340256.14100(c)Citation
522340156.14207Citation
522060056.19057Citation
Coal dust, noise and other contaminants. Silica records above ↑
Nuisance dust, respirable, <1% QtzFront-end Loader Operator
C/E: 00.04Concentration: 0000.42 · limit: 0010.00Source unit unspecified
Nuisance dust, respirable, <1% QtzLaborer, Bullgang
C/E: 00.08Concentration: 0000.79 · limit: 0010.00Source unit unspecified
Nuisance dust, respirable, <1% QtzLaborer, Bullgang
C/E: 00.03Concentration: 0000.30 · limit: 0010.00Source unit unspecified
Nuisance dust, respirable, <1% QtzTruck Loader
C/E: 00.04Concentration: 0000.36 · limit: 0010.00Source unit unspecified
Nuisance dust, respirable, <1% QtzLaborer, Bullgang
C/E: 00.04Concentration: 0000.43 · limit: 0010.00Source unit unspecified
Nuisance dust, respirable, <1% QtzPackaging Operations Worker
C/E: 00.04Concentration: 0000.42 · limit: 0010.00Source unit unspecified
Nuisance dust, respirable, <1% QtzFront-end Loader Operator
C/E: 00.04Concentration: 0000.36 · limit: 0010.00Source unit unspecified
Nuisance dust, respirable, <1% QtzPackaging Operations Worker
C/E: 00.05Concentration: 0000.54 · limit: 0010.00Source unit unspecified
SOURCE COVERAGE
Reporting dates and coverage
15 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors40Jan 25, 2008—Oct 20, 2025mine-keyed
Addresses of Recordidentity · logistics1Oct 1, 2010—Oct 1, 2010mine-keyed
Assessed Violationscompliance · legal390Feb 15, 2008—Jul 8, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal35Jul 29, 2009—Jun 11, 2015mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal18Mar 10, 2008—Jun 25, 2026mine-keyed
Contested Violationscompliance · legal37Feb 15, 2008—Sep 10, 2014mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety1,721Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety328Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance6Nov 22, 2007—Sep 7, 2022mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance146Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance40Not published—Not publishedmine-keyed
Inspectionssafety · compliance101Jan 25, 2008—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 · safety41Feb 28, 2008—Jul 8, 2026mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal420Jan 25, 2008—Oct 7, 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.