MINE DETAILS
KEYSTONE CEMENT COMPANY
MSHA MINE ID3600125
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- KEYSTONE CEMENT COMPANY40.70917, -75.40556Open 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
424,594reported 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 | 74,570 | 0.00 | 141 | 1/1 mines reporting |
| 2025 Q2 | 0 | 76,715 | 0.00 | 145 | 1/1 mines reporting |
| 2025 Q3 | 0 | 76,636 | 0.00 | 150 | 1/1 mines reporting |
| 2025 Q4 | 0 | 71,137 | 0.00 | 144 | 1/1 mines reporting |
| 2026 Q1 | 0 | 66,392 | 0.00 | 142 | 1/1 mines reporting |
| 2026 Q2 | 0 | 59,144 | 0.00 | 169 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
12140 significant & substantial (S&S)
Accident records
40 records classified as fatality
Proposed penalties · USD
344,569.00120 of 121 violations with amounts
On-site inspection hours
333.7511 inspections · 11 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 | 23 | 2 | 7,276.00 | 0 | 0 | 1 | 48.3 |
| 2025-Q2 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2025-Q3 | 24 | 7 | 50,328.00 | 0 | 0 | 3 | 82.0 |
| 2025-Q4 | 55 | 22 | 250,176.00 | 1 | 0 | 2 | 138.0 |
| 2026-Q1 | 2 | 0 | 302.00 | 1 | 0 | 1 | 2.0 |
| 2026-Q2 | 5 | 2 | 15,411.00 | 1 | 0 | 3 | 62.0 |
| 2026-Q3 | 12 | 7 | 21,076.00 | 1 | 0 | 1 | 1.5 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
HANDTOOLS (NONPOWERED) · ALL OTHER CASES (INCL 1ST AID)
Accident narrative
Employee was swinging a sledgehammer to clear a plugged chute. They swung the sledgehammer and missed the chute causing left thumb to be smashed in between the hammer's handle and the steel structure. This caused a laceration but did not require any stiches. The employee was prescribed antibiotics and a pain reliever.
Compliance Follow-up Inspection · 1.5 on-site hours
56.12032 · $642.00 proposed
56.14100(b) · S&S · $3,184.00 proposed
56.14205 · S&S · $267.00 proposed
56.14205 · S&S · $4,047.00 proposed
56.14112(a)(2) · $151.00 proposed
56.13021 · S&S · $288.00 proposed
56.15005 · S&S · $366.00 proposed
Description not reported
56.20003(a) · S&S · $5,574.00 proposed
56.20003(a) · S&S · $5,574.00 proposed
56.14112(a)(2) · $165.00 proposed
56.4201(a)(2) · $818.00 proposed
56.20003(a) · S&S · $7,084.00 proposed
56.14205 · $313.00 proposed
Regular Safety and Health Inspection · 60.3 on-site hours
56.12004 · $465.00 proposed
56.20003(a) · S&S · $7,084.00 proposed
56.14112(a)(2) · $465.00 proposed
Compliance Follow-up Inspection · 0.8 on-site hours
MACHINERY · ALL OTHER CASES (INCL 1ST AID)
Accident narrative
While cleaning the clean air side of Silo 51 air slide, an employee found the slide choked and not flowing. EE used a short air lance to clear cement and restore flow. Cement blew back into EE's face, entering EE's right eye under EE's safety glasses. EE was sent to an eye doctor; no damage was found and antibiotic eye drops were prescribed. No lost time resulted. Returned to job.
Compliance Follow-up Inspection · 1.0 on-site hours
Compliance Follow-up Inspection · 2.0 on-site hours
HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
On Feb 6, 2026, subcontractor, employee of Micronics (CRI MSHA ID C6220) was carrying blow pipes into the Keystone Cement Machine Shop. Leaving, their thumb was caught above the knuckle in a heavy counterweight-driven self-closing door that shut quickly and forcefully, causing a severe injury. The required stitches. The door's counterweight made it close fast, increasing the hazard
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.
—
Elementia MaterialescontrolsKeystone Cement CompanyoperatesKEYSTONE CEMENT COMPANY
msha-controller-operator-history · controller/operator co-tenure derived on mine 3600125—
Cementos Portland Valderrivas S AcontrolsKeystone Cement CompanyoperatesKEYSTONE CEMENT COMPANY
msha-controller-operator-history · controller/operator co-tenure derived on mine 3600125—
Giant Cement Holding InccontrolsKeystone Cement CompanyoperatesKEYSTONE CEMENT COMPANY
msha-controller-operator-history · controller/operator co-tenure derived on mine 3600125—
Giant Group LtdcontrolsKeystone Cement CompanyoperatesKEYSTONE CEMENT COMPANY
msha-controller-operator-history · controller/operator co-tenure derived on mine 3600125Other 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
113 historical accident/injury rows; 0 coded fatalities and 3,532 lost days across the published record.
ACCIDENT + INJURY RECORD8 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
956 violation rows across the full record; 253 carry an S&S flag and $718,884 appears in current assessed amounts.
ENFORCEMENT ACTIVITY259 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
372 personal; 20 area. 5 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 EXPOSURE392 samples
personal-health-samplesarea-samples04 / PRODUCTIONcontext
Quarterly production and employment
59K employee hours and 169 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
86 contested-violation rows, 86 civil-penalty docket/decision rows, and 26 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE198 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 CONTEXT43 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
115 inspection events and 6K published inspection hours across the historical record.
OVERSIGHT COVERAGE26 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 13, 2026. 20 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 56.12032Inspection and cover plates.1 recent row ↗30 CFR 56.14100Safety defects; examination, correction and records.1 recent row ↗30 CFR 56.14205Machinery, equipment, and tools.2 recent rows ↗30 CFR 56.14112Construction and maintenance of guards.2 recent rows ↗30 CFR 56.13021High-pressure hose connections.1 recent row ↗30 CFR 56.15005Safety belts and lines.1 recent row ↗30 CFR 56.20003Housekeeping.2 recent rows ↗30 CFR 56.4201Inspection.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
507895456.12032Citation
507895556.14100(b)S&S
507895356.14205S&S
507895256.14205S&S
507895156.14112(a)(2)Citation
507895056.13021S&S
507894956.15005S&S
5078948—Order
Coal dust, noise and other contaminants. Silica records above ↑
Nuisance dust, total, <1% QtzUtility Man
C/E: 00.01Concentration: 0000.14 · limit: 0010.00Source unit unspecified
Nuisance dust, total, <1% QtzUtility Man
C/E: 00.03Concentration: 0000.29 · limit: 0010.00Source unit unspecified
Nuisance dust, total, <1% QtzBagging Operator
C/E: 00.05Concentration: 0000.54 · limit: 0010.00Source unit unspecified
Nuisance dust, respirable, <1% QtzPackaging Operations Worker
C/E: 00.10Concentration: 0001.00 · limit: 0010.00Source unit unspecified
Zinc oxide fumesWelder, etc.
C/E: 00.00Concentration: 0000.00 · limit: 0010.00Source unit unspecified
Vanadium fumesWelder, etc.
C/E: 00.00Concentration: 0000.00 · limit: 0050.00Source unit unspecified
Nickel fumesWelder, etc.
C/E: 00.00Concentration: 0000.00 · limit: 0003.00Source unit unspecified
Molybdenum fumesWelder, etc.
C/E: 00.00Concentration: 0000.00 · limit: 0020.00Source unit unspecified
SOURCE COVERAGE
Reporting dates and coverage
16 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors113Jan 11, 2000—Aug 6, 2026mine-keyed
Addresses of Recordidentity · logistics1Jul 4, 1976—Jul 4, 1976mine-keyed
Assessed Violationscompliance · legal945Apr 5, 2000—Jul 11, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal86Dec 10, 2008—Sep 8, 2022mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal26Mar 3, 2003—Aug 3, 2026mine-keyed
Contested Violationscompliance · legal86Oct 31, 2007—Feb 24, 2022mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety4,114Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety882Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance4Jan 1, 1950—Dec 10, 1999mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance315Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance81Not published—Not publishedmine-keyed
Inspectionssafety · compliance115Apr 4, 2000—Jul 31, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety20Mar 21, 2017—Mar 21, 2017mine-keyed
Metal and Nonmetal Personal Health Sampleshealth · safety372Jan 11, 2001—Feb 7, 2024mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal956Apr 5, 2000—Jul 11, 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.