MINE DETAILS
Tehachapi Cement, LLC.
MSHA MINE ID0400196
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Tehachapi Cement, LLC.35.12528, -118.39778Open 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
649 significant & substantial (S&S)
Accident records
70 records classified as fatality
Proposed penalties · USD
17,531.0063 of 64 violations with amounts
On-site inspection hours
206.757 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 | 3 | 1 | 1,185.00 | 0 | 0 | 2 | 14.5 |
| 2025-Q2 | 0 | 0 | — | 1 | 0 | 0 | — |
| 2025-Q3 | 15 | 0 | 4,170.00 | 1 | 0 | 1 | 60.3 |
| 2025-Q4 | 22 | 7 | 8,310.00 | 1 | 0 | 1 | 65.0 |
| 2026-Q1 | 0 | 0 | — | 1 | 0 | 0 | — |
| 2026-Q2 | 23 | 1 | 3,866.00 | 0 | 0 | 2 | 66.0 |
| 2026-Q3 | 1 | 0 | — | 3 | 0 | 1 | 1.0 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
OTHER · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
The EE was sitting down in the break room, on a lunch break, when they felt something fall into their left eye.
56.4102
Verbal Hazard Complaint Inspections · 1.0 on-site hours
SLIP OR FALL OF PERSON · DAYS AWAY FROM WORK ONLY
Accident narrative
In order to access the equipment cabin, operator placed EE's right foot in lower step of the ladder, while holding both handrails with both hands. When EE tried to step up, EE's foot slipped causing the fall hitting EE's right knee with the step. At the same time, EE lost grip of the handrail hitting EE's right hand, specifically in the thenar muscle group.
HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
EE was working inside a dust collector. The employee attempted to lift and remove the bag with the help of two employees. The EE had their right hand placed below the cage housing allowing for their right index finger to become pinched. The employee sustained a laceration injury and fracture to the right index finger.
56.20003(a) · $151.00 proposed
56.14112(b) · $151.00 proposed
56.14112(b) · $151.00 proposed
56.14112(b) · $151.00 proposed
56.11003 · S&S · $245.00 proposed
50.30(a) · $151.00 proposed
50.30(a) · $151.00 proposed
50.30(a) · $151.00 proposed
50.30(a) · $151.00 proposed
56.12028 · $366.00 proposed
56.14207 · $151.00 proposed
56.14112(b) · $151.00 proposed
56.20003(b) · $151.00 proposed
56.12028 · $151.00 proposed
56.4104(b) · $151.00 proposed
56.13011 · $193.00 proposed
56.14112(a)(1) · $151.00 proposed
56.14112(a)(1) · $151.00 proposed
56.12004 · $151.00 proposed
Regular Safety and Health Inspection · 63.0 on-site hours
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.
—
UNACEM Corp S A AcontrolsUNACEM North AmericaoperatesTehachapi Cement, LLC.
msha-controller-operator-history · controller/operator co-tenure derived on mine 0400196—
Martin Marietta Materials InccontrolsUNACEM North AmericaoperatesTehachapi Cement, LLC.
msha-controller-operator-history · controller/operator co-tenure derived on mine 0400196—
Martin Marietta Materials InccontrolsLehigh Cement West LLCoperatesTehachapi Cement, LLC.
msha-controller-operator-history · controller/operator co-tenure derived on mine 0400196—
Heidelberg Materials AGcontrolsLehigh Cement West LLCoperatesTehachapi Cement, LLC.
msha-controller-operator-history · controller/operator co-tenure derived on mine 0400196—
Heidelberg Materials AGcontrolsLehigh Southwest CementoperatesTehachapi Cement, LLC.
msha-controller-operator-history · controller/operator co-tenure derived on mine 0400196—
Cimenteries Cbr CementbedrijvencontrolsCalaveras Cement CompanyoperatesTehachapi Cement, LLC.
msha-controller-operator-history · controller/operator co-tenure derived on mine 0400196—
Monolith Portland Cement CompanycontrolsMonolith Portland Cement CompanyoperatesTehachapi Cement, LLC.
msha-controller-operator-history · controller/operator co-tenure derived on mine 0400196Other 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
137 historical accident/injury rows; 2 coded fatalities and 2,933 lost days across the published record.
ACCIDENT + INJURY RECORD16 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
1,242 violation rows across the full record; 292 carry an S&S flag and $1,069,747 appears in current assessed amounts.
ENFORCEMENT ACTIVITY219 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHcontext
Occupational health samples
28 personal; 6 area. 0 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 EXPOSURE34 samples
personal-health-samplesarea-samples04 / PRODUCTIONcontext
Quarterly production and employment
64K employee hours and 120 summed average employees across reported subunits in the latest published quarter.
2002-Q40 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
183 contested-violation rows, 203 civil-penalty docket/decision rows, and 134 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE520 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 CONTEXT44 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
153 inspection events and 7K published inspection hours across the historical record.
OVERSIGHT COVERAGE25 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 17, 2026. 13 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 |
|---|---|---|---|---|---|
| 000000202602204200 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Cleanup Man | 0.91× published limitConcentration: 0000.86 · limit: 0000.95Source unit unspecified | Not reported | NO ACTIONInspection F01788F |
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 56.4102Spillage and leakage.1 recent row ↗30 CFR 56.20003Housekeeping.1 recent row ↗30 CFR 56.14112Construction and maintenance of guards.3 recent rows ↗30 CFR 56.11003Construction and maintenance of ladders.1 recent row ↗30 CFR 50.30Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.4 recent rows ↗30 CFR 56.12028Testing grounding systems.1 recent row ↗30 CFR 56.14207Parking procedures for unattended equipment.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
989057056.4102Citation
516683756.20003(a)Citation
516683656.14112(b)Citation
516683556.14112(b)Citation
516683456.14112(b)Citation
516683356.11003S&S
516667350.30(a)Citation
516667250.30(a)Citation
Coal dust, noise and other contaminants. Silica records above ↑
Respirable dust, <.1mgLaborer, Bullgang
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Nuisance dust, total, <1% QtzLaborer, Bullgang
C/E: 00.17Concentration: 0001.68 · limit: 0010.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzLaborer, Bullgang
C/E: 00.00Concentration: 0001.30 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzLaborer, Bullgang
C/E: 00.00Concentration: 0000.77 · limit: 0000.00Source unit unspecified
Nuisance dust, respirable, <1% QtzLaborer, Bullgang
C/E: 00.17Concentration: 0001.70 · limit: 0010.00Source unit unspecified
Nuisance dust, respirable, <1% QtzTruck Driver
C/E: 00.03Concentration: 0000.34 · limit: 0010.00Source unit unspecified
Nuisance dust, respirable, <1% QtzLaborer, Bullgang
C/E: 00.10Concentration: 0000.95 · limit: 0010.00Source unit unspecified
Respirable dust, <.1mgDrill Helper
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
SOURCE COVERAGE
Reporting dates and coverage
16 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors137Jan 31, 2000—Sep 11, 2026mine-keyed
Addresses of Recordidentity · logistics1Aug 16, 1976—Aug 16, 1976mine-keyed
Assessed Violationscompliance · legal1,228Mar 29, 2000—May 28, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal203Mar 5, 2003—Sep 4, 2026mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal134Oct 31, 2001—Oct 1, 2018mine-keyed
Contested Violationscompliance · legal183Mar 21, 2006—Oct 30, 2024mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety4,474Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety839Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance7Jan 1, 1950—Dec 27, 2022mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance36Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance81Not published—Not publishedmine-keyed
Inspectionssafety · compliance153Mar 29, 2000—Sep 8, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety6Sep 4, 2009—Sep 4, 2009mine-keyed
Metal and Nonmetal Personal Health Sampleshealth · safety28Oct 3, 2001—May 28, 2026mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal1,242Mar 29, 2000—Sep 9, 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.