MINE DETAILS
Lyons Cement Plant Cemex Inc
MSHA MINE ID0500344
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Lyons Cement Plant Cemex Inc40.21167, -105.23611Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-17. MSHA quarterly production and employment reports.
Coal production
—reported short tons
Hours worked
—reported employee hours
Tons per hour
—production ÷ 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 | — | — | — | — | No report |
| 2025 Q2 | — | — | — | — | No report |
| 2025 Q3 | — | — | — | — | No report |
| 2025 Q4 | — | — | — | — | No report |
| 2026 Q1 | — | — | — | — | No report |
| 2026 Q2 | — | — | — | — | No report |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-17
Violations
8421 significant & substantial (S&S)
Accident records
90 records classified as fatality
Proposed penalties · USD
140,382.0083 of 84 violations with amounts
On-site inspection hours
309.7510 inspections · 10 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 | 14 | 2 | 31,239.00 | 1 | 0 | 3 | 77.3 |
| 2025-Q2 | 0 | 0 | — | 2 | 0 | 0 | — |
| 2025-Q3 | 26 | 6 | 41,183.00 | 1 | 0 | 3 | 94.3 |
| 2025-Q4 | 13 | 1 | 5,837.00 | 3 | 0 | 2 | 34.5 |
| 2026-Q1 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2026-Q2 | 0 | 0 | — | 1 | 0 | 1 | 1.0 |
| 2026-Q3 | 31 | 12 | 62,123.00 | 1 | 0 | 1 | 102.8 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
HANDLING OF MATERIALS · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
While replacing a screw conveyor at the Kiln Baghouse, an employee sustained a lower back burn from alkali powder exposure. The injury worsened over two days despite first aid and was reported to supervision and Health & Safety. The employee was later treated at a clinic, received a tetanus vaccine, and was diagnosed with a second-degree chemical burn.
56.12028 · $177.00 proposed
56.11001 · S&S · $3,736.00 proposed
56.11001 · S&S · $4,383.00 proposed
56.23003(b) · $151.00 proposed
46.9(a) · $151.00 proposed
56.20003(a) · S&S · $2,936.00 proposed
56.12002 · $267.00 proposed
56.15001 · S&S · $883.00 proposed
56.11001 · S&S · $1,431.00 proposed
56.14109(a) · $267.00 proposed
56.12004 · $177.00 proposed
56.12028 · $151.00 proposed
56.12028 · $151.00 proposed
56.12030 · $209.00 proposed
56.12028 · $209.00 proposed
56.16003 · $755.00 proposed
56.12008 · $209.00 proposed
56.11027 · S&S · $5,144.00 proposed
56.11001 · $697.00 proposed
56.12028 · $151.00 proposed
56.14115 · $313.00 proposed
56.12004 · $209.00 proposed
56.14205 · S&S · $11,450.00 proposed
56.18002(a) · S&S · $3,448.00 proposed
Safety sources and definitions
MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-17.
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.
—
Cemex S AcontrolsCEMEX Construction Materials South, LLCoperatesLyons Cement Plant Cemex Inc
msha-controller-operator-history · controller/operator co-tenure derived on mine 0500344—
Cemex S AcontrolsCemex IncoperatesLyons Cement Plant Cemex Inc
msha-controller-operator-history · controller/operator co-tenure derived on mine 0500344—
Southdown InccontrolsSouthdown IncoperatesLyons Cement Plant Cemex Inc
msha-controller-operator-history · controller/operator co-tenure derived on mine 0500344—
Martin Marietta Materials InccontrolsMartin Marietta CementoperatesLyons Cement Plant Cemex Inc
msha-controller-operator-history · controller/operator co-tenure derived on mine 0500344Other 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
198 historical accident/injury rows; 0 coded fatalities and 1,740 lost days across the published record.
ACCIDENT + INJURY RECORD29 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
1,138 violation rows across the full record; 200 carry an S&S flag and $1,107,293 appears in current assessed amounts.
ENFORCEMENT ACTIVITY371 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
192 personal. 10 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 EXPOSURE192 samples
personal-health-samples04 / PRODUCTIONcontext
Quarterly production and employment
52K employee hours and 101 summed average employees across reported subunits in the latest published quarter.
2002-Q40 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
296 contested-violation rows, 296 civil-penalty docket/decision rows, and 14 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE606 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 CONTEXT29 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
118 inspection events and 7K published inspection hours across the historical record.
OVERSIGHT COVERAGE32 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 17, 2026. 66 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 |
|---|---|---|---|---|---|
| 000000202603166700 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Building Repair/Maint. | 1.05× published limitConcentration: 0001.61 · limit: 0001.54Source unit unspecified | Not reported | LAB RESULTS INDICATE EXPOSURE LIMIT EXCEEDEDInspection F0345B6 |
| 000000202603166600 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Cleanup Man | 0.46× published limitConcentration: 0001.50 · limit: 0003.23Source unit unspecified | Not reported | NO ACTIONInspection F0345B6 |
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 56.12028Testing grounding systems.2 recent rows ↗30 CFR 56.11001Safe access.3 recent rows ↗30 CFR 56.23003Requirements for written safety program.1 recent row ↗30 CFR 46.9Records of training.1 recent row ↗30 CFR 56.20003Housekeeping.1 recent row ↗30 CFR 56.12002Controls and switches.1 recent row ↗30 CFR 56.15001First-aid materials.1 recent row ↗30 CFR 56.14109Unguarded conveyors with adjacent travelways.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
521315156.12028Citation
521315056.11001S&S
521314956.11001S&S
521314856.23003(b)Citation
521314746.9(a)Citation
521314656.20003(a)S&S
521314556.12002Citation
521314456.15001S&S
Coal dust, noise and other contaminants. Silica records above ↑
Nuisance dust, respirable, <1% QtzKiln/Dryer Operator
C/E: 00.32Concentration: 0003.17 · limit: 0010.00Source unit unspecified
Nuisance dust, respirable, <1% QtzCleanup Man
C/E: 00.40Concentration: 0004.02 · limit: 0010.00Source unit unspecified
Nuisance dust, respirable, <1% QtzBuilding Repair/Maint.
C/E: 00.20Concentration: 0001.99 · limit: 0010.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzIron Worker
C/E: 00.00Concentration: 0001.23 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzIron Worker
C/E: 00.00Concentration: 0002.17 · limit: 0000.00Source unit unspecified
Zinc oxide fumesWelder, etc.
C/E: 00.00Concentration: 0000.00 · limit: 0005.00Source unit unspecified
SOURCE COVERAGE
Reporting dates and coverage
15 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors198Feb 2, 2000—Jul 28, 2026mine-keyed
Addresses of Recordidentity · logistics1Oct 5, 1989—Oct 5, 1989mine-keyed
Assessed Violationscompliance · legal1,124Mar 9, 2000—Jul 28, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal296Apr 24, 2007—Sep 29, 2025mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal14Jan 20, 2004—Mar 5, 2008mine-keyed
Contested Violationscompliance · legal296Jul 22, 2005—Jul 28, 2026mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety2,450Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety590Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance4Jan 1, 1950—Jul 22, 2015mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance36Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance81Not published—Not publishedmine-keyed
Inspectionssafety · compliance118Mar 9, 2000—Jul 15, 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 · safety192Dec 3, 2003—Jul 27, 2026mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal1,138Mar 9, 2000—Jul 28, 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.