MINE DETAILS
Mountain Cement Company
MSHA MINE ID4800007
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Mountain Cement Company41.26778, -105.60306Open 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
465,690reported 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 | 81,918 | 0.00 | 111 | 1/1 mines reporting |
| 2025 Q2 | 0 | 74,569 | 0.00 | 120 | 1/1 mines reporting |
| 2025 Q3 | 0 | 80,786 | 0.00 | 119 | 1/1 mines reporting |
| 2025 Q4 | 0 | 77,584 | 0.00 | 119 | 1/1 mines reporting |
| 2026 Q1 | 0 | 80,496 | 0.00 | 122 | 1/1 mines reporting |
| 2026 Q2 | 0 | 70,337 | 0.00 | 117 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
15946 significant & substantial (S&S)
Accident records
250 records classified as fatality
Proposed penalties · USD
150,949.00151 of 159 violations with amounts
On-site inspection hours
503.7520 inspections · 20 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 | 22 | 7 | 16,944.00 | 0 | 0 | 1 | 84.0 |
| 2025-Q2 | 3 | 0 | 819.00 | 3 | 0 | 3 | 97.3 |
| 2025-Q3 | 33 | 6 | 23,472.00 | 1 | 0 | 2 | 13.0 |
| 2025-Q4 | 9 | 4 | 11,966.00 | 3 | 0 | 3 | 127.3 |
| 2026-Q1 | 23 | 5 | 24,480.00 | 8 | 0 | 5 | 35.5 |
| 2026-Q2 | 3 | 2 | 30,760.00 | 3 | 0 | 3 | 14.8 |
| 2026-Q3 | 66 | 22 | 42,508.00 | 7 | 0 | 3 | 132.0 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
SLIP OR FALL OF PERSON · DAYS AWAY FROM WORK ONLY
Accident narrative
Employee was using a pry bar to close a rail car door when it slipped out. The employee stumbled back and struck their shoulder against the vibrator causing possible rotator cuff impingement.
HANDLING OF MATERIALS · DAYS AWAY FROM WORK ONLY
Accident narrative
Employee was conducting electrical work from a manlift. Employee could not recall a specific event to cause the injury. They reported pain when inhaling deeply and upper back pain
46.7(a) · S&S
50.20-1
56.14205 · S&S
103 (g) Written Notification Hazard Complaint Inspectio · 8.8 on-site hours
HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
At approximately 6:00 pm employee and their partner were connecting steel, at the time of the incident there were strong gusts of wind. The beam was being pulled away by the wind while employee was holding it causing a strained shoulder.
EXPLODING VESSELS UNDER PRESSURE · DAYS AWAY FROM WORK ONLY
Accident narrative
Employee was disconnecting a plugged air lance and the metal fitting hit the employee on the right side of the face above the lip. This resulted in a laceration and broken dentures
STEPPING OR KNEELING ON OBJECT · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
Employee was climbing down from ductwork and stepped on a piece of angle iron and their foot slipped and when they landed on the gravel they twisted their knee.
56.14107(a) · S&S · $818.00 proposed
56.14107(a) · $165.00 proposed
56.12028 · $151.00 proposed
56.12006 · S&S · $549.00 proposed
56.12006 · S&S · $818.00 proposed
47.44(b) · S&S · $549.00 proposed
56.12028 · $151.00 proposed
56.16003 · $151.00 proposed
56.14112(a)(1) · $165.00 proposed
56.14107(a) · $165.00 proposed
56.20003(a) · S&S · $4,047.00 proposed
56.20003(a) · S&S · $1,219.00 proposed
56.4201(a)(1) · $151.00 proposed
56.14112(b) · $151.00 proposed
56.12006 · S&S · $818.00 proposed
56.4201(a)(1) · $151.00 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.
—
Eagle Materials InccontrolsMountain Cement Company LLCoperatesMountain Cement Company
msha-controller-operator-history · controller/operator co-tenure derived on mine 4800007—
Monolith Portland Cement CompanycontrolsMonolith Portland Cement CompanyoperatesMountain Cement Company
msha-controller-operator-history · controller/operator co-tenure derived on mine 4800007Other 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
175 historical accident/injury rows; 0 coded fatalities and 2,258 lost days across the published record.
ACCIDENT + INJURY RECORD39 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
981 violation rows across the full record; 218 carry an S&S flag and $877,649 appears in current assessed amounts.
ENFORCEMENT ACTIVITY308 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
180 personal. 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 EXPOSURE180 samples
personal-health-samples04 / PRODUCTIONcontext
Quarterly production and employment
70K employee hours and 117 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
165 contested-violation rows, 191 civil-penalty docket/decision rows, and 66 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE422 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 CONTEXT36 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
121 inspection events and 7K published inspection hours across the historical record.
OVERSIGHT COVERAGE38 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 13, 2026. 48 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 |
|---|---|---|---|---|---|
| 000000202603472800 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Utility Man | 0.74× published limitConcentration: 0001.80 · limit: 0002.44Source unit unspecified | Not reported | NO ACTIONInspection F0345B8 |
| 000000202603473100 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Building Repair/Maint. | 0× published limitConcentration: 0000.35 · limit: 0000.00Source unit unspecified | Not reported | NO ACTIONInspection F0345B8 |
| 000000202603472900 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Utility Man | 0× published limitConcentration: 0000.47 · limit: 0000.00Source unit unspecified | Not reported | NO ACTIONInspection F0345B8 |
| 000000202603472700 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Cleanup Man | 0.47× published limitConcentration: 0001.14 · limit: 0002.44Source unit unspecified | Not reported | NO ACTIONInspection F0345B8 |
| 000000202603473000 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Building Repair/Maint. | 0× published limitConcentration: 0000.48 · limit: 0000.00Source unit unspecified | Not reported | NO ACTIONInspection F0345B8 |
| 000000202600053400 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Electrician | 0× published limitConcentration: 0000.12 · limit: 0000.00Source unit unspecified | Not reported | NO ACTIONInspection F02BB3F |
| 000000202600053500 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Crusher Oper/Worker | 0× published limitConcentration: 0000.46 · limit: 0000.00Source unit unspecified | Not reported | NO ACTIONInspection F02BB3F |
| 000000202600053600 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Utility Man | 0× published limitConcentration: 0000.66 · limit: 0000.00Source unit unspecified | Not reported | NO ACTIONInspection F02BB3F |
| 000000202600053800 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Laborer, Bullgang | 1.12× published limitConcentration: 0002.60 · limit: 0002.33Source unit unspecified | Not reported | LAB RESULTS INDICATE EXPOSURE LIMIT EXCEEDEDInspection F02BB3F |
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 46.7New task training.1 recent row ↗30 CFR 50.20-1General instructions for completing MSHA Form 7000-1.1 recent row ↗30 CFR 56.14205Machinery, equipment, and tools.1 recent row ↗30 CFR 56.14107Moving machine parts.2 recent rows ↗30 CFR 56.12028Testing grounding systems.2 recent rows ↗30 CFR 56.12006Distribution boxes.2 recent rows ↗30 CFR 47.44Temporary, portable containers.1 recent row ↗30 CFR 56.16003Storage of hazardous materials.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
521139646.7(a)S&S
521139550.20-1Citation
521139356.14205S&S
521318656.14107(a)S&S
521318556.14107(a)Citation
521318456.12028Citation
521318356.12006S&S
521318256.12006S&S
Coal dust, noise and other contaminants. Silica records above ↑
Unlisted Particulate, respirable, <1% QtzMechanic
C/E: 00.00Concentration: 0002.28 · 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 · contractors175Jan 12, 2000—Sep 26, 2026mine-keyed
Addresses of Recordidentity · logistics1Apr 30, 1986—Apr 30, 1986mine-keyed
Assessed Violationscompliance · legal959Jan 11, 2000—Aug 21, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal191Oct 31, 2001—Sep 30, 2026mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal66Aug 4, 2000—Dec 22, 2022mine-keyed
Contested Violationscompliance · legal165Apr 19, 2005—Apr 17, 2026mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety3,506Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety826Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance2Jan 1, 1950—Jan 27, 1986mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance289Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance73Not published—Not publishedmine-keyed
Inspectionssafety · compliance121Jan 11, 2000—Sep 23, 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 · safety180Mar 28, 2001—Aug 21, 2026mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal981Jan 11, 2000—Sep 25, 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.