MINE DETAILS
San Rafael Rock Quarry
MSHA MINE ID0400021
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- San Rafael Rock Quarry37.98417, -122.45333Open 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
56,195reported 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 | 7,566 | 0.00 | 15 | 1/1 mines reporting |
| 2025 Q2 | 0 | 9,779 | 0.00 | 20 | 1/1 mines reporting |
| 2025 Q3 | 0 | 10,992 | 0.00 | 22 | 1/1 mines reporting |
| 2025 Q4 | 0 | 8,674 | 0.00 | 17 | 1/1 mines reporting |
| 2026 Q1 | 0 | 8,981 | 0.00 | 17 | 1/1 mines reporting |
| 2026 Q2 | 0 | 10,203 | 0.00 | 14 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
21 significant & substantial (S&S)
Accident records
20 records classified as fatality
Proposed penalties · USD
848.002 of 2 violations with amounts
On-site inspection hours
28.004 inspections · 4 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 | — | 0 | 0 | 0 | — |
| 2025-Q2 | 1 | 1 | 697.00 | 1 | 0 | 1 | 3.3 |
| 2025-Q3 | 0 | 0 | — | 1 | 0 | 1 | 5.3 |
| 2025-Q4 | 1 | 0 | 151.00 | 0 | 0 | 1 | 7.5 |
| 2026-Q1 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2026-Q2 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2026-Q3 | 0 | 0 | — | 0 | 0 | 1 | 12.0 |
| 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 |
|---|---|---|
| 30 CFR 56.15005Safety belts and lines. | 1 | 1 |
| 30 CFR 56.4201Inspection. | 1 | 0 |
Safety activity
Regular Safety and Health Inspection · 12.0 on-site hours
Regular Safety and Health Inspection · 7.5 on-site hours
56.4201(a)(2) · $151.00 proposed
Spot Inspection · 5.3 on-site hours
SLIP OR FALL OF PERSON · DAYS AWAY FROM WORK ONLY
Accident narrative
On 8/12 employee was descending tower stair case and slipped on step and twisted lower back. On 8/19 it was brought to our attention as they wanted to seek treatment .
Spot Inspection · 3.3 on-site hours
56.15005 · S&S · $697.00 proposed
HANDTOOLS (NONPOWERED) · DAYS AWAY FROM WORK ONLY
Accident narrative
Employee was injured while attempting to dislodge a rock from the portable crusher. While standing on the short stub conveyor and using a pry bar, they lost balance and fell approximately 4 feet onto the stacker conveyor below, resulting in an injury to right shoulder.
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.
—
CRH PLCcontrolsDutra MaterialsoperatesSan Rafael Rock Quarry
msha-controller-operator-history · controller/operator co-tenure derived on mine 0400021—
Dean SoilandcontrolsDutra MaterialsoperatesSan Rafael Rock Quarry
msha-controller-operator-history · controller/operator co-tenure derived on mine 0400021—
Bill T DutracontrolsDutra MaterialsoperatesSan Rafael Rock Quarry
msha-controller-operator-history · controller/operator co-tenure derived on mine 0400021—
Dillingham Construction CorpcontrolsBasalt Rock Div-Dillingham Heavy Const IncoperatesSan Rafael Rock Quarry
msha-controller-operator-history · controller/operator co-tenure derived on mine 0400021Other 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
30 historical accident/injury rows; 0 coded fatalities and 468 lost days across the published record.
ACCIDENT + INJURY RECORD2 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
274 violation rows across the full record; 54 carry an S&S flag and $94,136 appears in current assessed amounts.
ENFORCEMENT ACTIVITY30 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHcontext
Occupational health samples
29 personal. 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-samples04 / PRODUCTIONcontext
Quarterly production and employment
10K employee hours and 14 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
26 contested-violation rows, 26 civil-penalty docket/decision rows, and 30 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE82 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 CONTEXT2 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
79 inspection events and 2K published inspection hours across the historical record.
OVERSIGHT COVERAGE16 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 13, 2026. 16 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 |
|---|---|---|---|---|---|
| 000000202603621100 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Dry Screen Plant Operator | 0.51× published limitConcentration: 0000.35 · limit: 0000.68Source unit unspecified | Not reported | NO ACTIONInspection F036E01 |
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 56.4201Inspection.1 recent row ↗30 CFR 56.15005Safety belts and lines.1 recent row ↗30 CFR 56.14100Safety defects; examination, correction and records.2 recent rows ↗30 CFR 56.14112Construction and maintenance of guards.3 recent rows ↗30 CFR 56.12004Electrical conductors.1 recent row ↗30 CFR 56.4200General requirements.1 recent row ↗30 CFR 50.30Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.1 recent row ↗30 CFR 56.12018Identification of power switches.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
510232456.4201(a)(2)Citation
999956256.15005S&S
989032756.14100(b)Citation
989032656.14112(b)Citation
989032556.14112(b)Citation
989032456.14112(b)Citation
989032356.12004Citation
930429956.4200(a)(1)Citation
Coal dust, noise and other contaminants. Silica records above ↑
Respirable dust, <.1mgTruck Driver
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgWagon Drill Operator
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
Respirable dust, <.1mgFront-end Loader Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgTruck Driver
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgTruck Driver
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgMechanic
C/E: 00.00Concentration: 0000.00 · 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 · contractors30Jun 28, 2000—Aug 12, 2025mine-keyed
Addresses of Recordidentity · logistics1Sep 16, 1992—Sep 16, 1992mine-keyed
Assessed Violationscompliance · legal269Aug 1, 2000—Oct 22, 2025mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal26Sep 5, 2012—Mar 12, 2026mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal30Oct 17, 2007—Dec 31, 2012mine-keyed
Contested Violationscompliance · legal26Feb 23, 2011—May 30, 2025mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety33Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety9Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance4Jan 1, 1950—Nov 15, 2024mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance212Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance54Not published—Not publishedmine-keyed
Inspectionssafety · compliance79Aug 1, 2000—Sep 1, 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 · safety29Jan 9, 2001—Sep 2, 2026mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal274Aug 1, 2000—Oct 22, 2025mine-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.