MINE DETAILS
Napa Quarry
MSHA MINE ID0400023
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Napa Quarry38.26194, -122.27583Open 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
52,080reported 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 | 8,845 | 0.00 | 16 | 1/1 mines reporting |
| 2025 Q2 | 0 | 7,536 | 0.00 | 14 | 1/1 mines reporting |
| 2025 Q3 | 0 | 9,228 | 0.00 | 17 | 1/1 mines reporting |
| 2025 Q4 | 0 | 7,342 | 0.00 | 17 | 1/1 mines reporting |
| 2026 Q1 | 0 | 9,809 | 0.00 | 21 | 1/1 mines reporting |
| 2026 Q2 | 0 | 9,320 | 0.00 | 23 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
00 significant & substantial (S&S)
Accident records
30 records classified as fatality
Proposed penalties · USD
—0 of 0 violations with amounts
On-site inspection hours
32.506 inspections · 6 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 | — | 1 | 0 | 0 | — |
| 2025-Q2 | 0 | 0 | — | 0 | 0 | 2 | 7.0 |
| 2025-Q3 | 0 | 0 | — | 0 | 0 | 1 | 9.5 |
| 2025-Q4 | 0 | 0 | — | 0 | 0 | 1 | 10.5 |
| 2026-Q1 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2026-Q2 | 0 | 0 | — | 1 | 0 | 0 | — |
| 2026-Q3 | 0 | 0 | — | 1 | 0 | 2 | 5.5 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
| Section | Violations | S&S |
|---|
No violation records in this period.
Safety activity
HANDLING OF MATERIALS · DAYS AWAY FROM WORK ONLY
Accident narrative
While performing a preventative maintenance inspection on a dozer, employee scraped EE's right shin against the equipment while descending resulting in a laceration to EE's right shin that required medical treatment, including eight stitches.
103 (g) Written Notification Hazard Complaint Inspectio · 1.5 on-site hours
Regular Safety and Health Inspection · 4.0 on-site hours
MACHINERY · DYS AWY FRM WRK & RESTRCTD ACT
Accident narrative
On April 13, 2026, employee experienced a right elbow strain disconnecting a loader shroud. Employee attributed it to an awkward position while using an impact gun. Reported on April 16, 2026, received an initial first aid assessment . Due to ongoing pain, a medical evaluation on April 28, 2026, diagnosed medial epicondylitis, leading to modified duty.
Regular Safety and Health Inspection · 10.5 on-site hours
Spot Inspection · 9.5 on-site hours
103 (g) Written Notification Hazard Complaint Inspectio · 3.5 on-site hours
Regular Safety and Health Inspection · 3.5 on-site hours
SLIP OR FALL OF PERSON · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
Loader operator missed the last rung on the ladder while dismounting the loader, falling to the ground (Operator did not use three-points of contact, carrying pre/post-shift book in one of EE's hands).
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.
—
Vulcan Materials CompanycontrolsCalMat CooperatesNapa Quarry
msha-controller-operator-history · controller/operator co-tenure derived on mine 0400023—
Legacy Vulcan Corp (Form:Vulcan Materials Co)controlsCalMat CooperatesNapa Quarry
msha-controller-operator-history · controller/operator co-tenure derived on mine 0400023—
James M Syar et alcontrolsSyar Industries IncoperatesNapa Quarry
msha-controller-operator-history · controller/operator co-tenure derived on mine 0400023—
Dillingham Construction CorpcontrolsBasalt Rock Div-Dillingham Heavy Const IncoperatesNapa Quarry
msha-controller-operator-history · controller/operator co-tenure derived on mine 0400023Other 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
42 historical accident/injury rows; 0 coded fatalities and 786 lost days across the published record.
ACCIDENT + INJURY RECORD5 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
112 violation rows across the full record; 21 carry an S&S flag and $23,787 appears in current assessed amounts.
ENFORCEMENT ACTIVITY7 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHcontext
Occupational health samples
28 personal; 1 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 EXPOSURE29 samples
personal-health-samplesarea-samples04 / PRODUCTIONcontext
Quarterly production and employment
9K employee hours and 23 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
19 contested-violation rows, 19 civil-penalty docket/decision rows, and 16 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE54 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 CONTEXT1 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
77 inspection events and 1K published inspection hours across the historical record.
OVERSIGHT COVERAGE14 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 13, 2026. 9 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 47.41Requirement for container labels.1 recent row ↗30 CFR 56.12018Identification of power switches.1 recent row ↗30 CFR 56.14112Construction and maintenance of guards.1 recent row ↗30 CFR 56.20011Barricades and warning signs.1 recent row ↗30 CFR 47.54Availability of an MSDS.1 recent row ↗30 CFR 56.4102Spillage and leakage.2 recent rows ↗30 CFR 56.12032Inspection and cover plates.1 recent row ↗30 CFR 50.30Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.2 recent rows ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
891255747.41(a)Citation
891255656.12018Citation
961960356.14112(b)Citation
943385256.20011Citation
961954347.54Citation
961954256.4102Citation
961954156.4102Citation
950221456.12032Citation
Coal dust, noise and other contaminants. Silica records above ↑
Respirable dust, <.1mgLaborer, Bullgang
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgLaborer, Bullgang
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgCrusher Oper/Worker
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzWasher Operator
C/E: 00.00Concentration: 0000.25 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgFront-end Loader Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzCrusher Oper/Worker
C/E: 00.00Concentration: 0000.39 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzLaborer, Bullgang
C/E: 00.00Concentration: 0000.84 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzLaborer, Bullgang
C/E: 00.00Concentration: 0000.20 · 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 · contractors42Sep 24, 2001—Aug 28, 2026mine-keyed
Addresses of Recordidentity · logistics1Mar 6, 2024—Mar 6, 2024mine-keyed
Assessed Violationscompliance · legal108Feb 21, 2001—Mar 21, 2024mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal19Mar 24, 2011—Sep 25, 2013mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal16Jun 23, 2003—Nov 14, 2017mine-keyed
Contested Violationscompliance · legal19Mar 11, 2009—Feb 14, 2012mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety22Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety4Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance4Jan 1, 1950—Aug 13, 2022mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance318Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance81Not published—Not publishedmine-keyed
Inspectionssafety · compliance77Feb 21, 2001—Aug 13, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety1Mar 1, 2022—Mar 1, 2022mine-keyed
Metal and Nonmetal Personal Health Sampleshealth · safety28Jul 12, 2001—Jul 23, 2025mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal112Feb 21, 2001—Mar 21, 2024mine-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.