MINE DETAILS
RILLITO PLANT
MSHA MINE ID0201138
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- RILLITO PLANT32.41139, -111.14944Open 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
402,626reported 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 | 66,898 | 0.00 | 130 | 1/1 mines reporting |
| 2025 Q2 | 0 | 69,982 | 0.00 | 128 | 1/1 mines reporting |
| 2025 Q3 | 0 | 67,210 | 0.00 | 125 | 1/1 mines reporting |
| 2025 Q4 | 0 | 65,395 | 0.00 | 126 | 1/1 mines reporting |
| 2026 Q1 | 0 | 65,399 | 0.00 | 123 | 1/1 mines reporting |
| 2026 Q2 | 0 | 67,742 | 0.00 | 126 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
478 significant & substantial (S&S)
Accident records
90 records classified as fatality
Proposed penalties · USD
12,956.0036 of 47 violations with amounts
On-site inspection hours
148.007 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 | 24 | 5 | 6,712.00 | 3 | 0 | 1 | 32.3 |
| 2025-Q2 | 5 | 2 | 4,326.00 | 1 | 0 | 2 | 38.0 |
| 2025-Q3 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2025-Q4 | 0 | 0 | — | 1 | 0 | 0 | — |
| 2026-Q1 | 7 | 0 | 1,918.00 | 0 | 0 | 2 | 41.5 |
| 2026-Q2 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2026-Q3 | 11 | 1 | — | 4 | 0 | 2 | 36.3 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
Compliance Follow-up Inspection · 1.8 on-site hours
OTHER · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
Supervisor was removing an employee from site for cause when an altercation occurred.
56.12004
56.12028
56.14132(a)
56.11002
Regular Safety and Health Inspection · 34.5 on-site hours
56.20003(a) · S&S
56.12006
56.20003(a)
56.12028
56.12028
56.12028
56.14207
SLIP OR FALL OF PERSON · DAYS AWAY FROM WORK ONLY
Accident narrative
Injury, fractured right fibular. Employee slipped on loose clinker material resulting in fracture
STRIKING OR BUMPING · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
Employee was walking through the plant to get to the parking lot at the end of EE's shift. EE walked past a flatbed truck with a large piece of expanded metal laying on it and scraped EE's arm along it, resulting in a three-inch laceration, requiring three stitches. No lost time.
POWERED HAULAGE · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
Holding on to upper rail of boomlift basket when coming down the basket made contact with the silo pinching their finger causing a fracture.
Compliance Follow-up Inspection · 10.5 on-site hours
56.12028 · $336.00 proposed
56.4201(a)(1) · $151.00 proposed
56.4201(a)(1) · $151.00 proposed
56.12032 · $504.00 proposed
56.12032 · $151.00 proposed
56.12020 · $432.00 proposed
56.4201(a)(1) · $193.00 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.
—
Taiheiyo Cement CorpcontrolsCalPortland CompanyoperatesRILLITO PLANT
msha-controller-operator-history · controller/operator co-tenure derived on mine 0201138—
Calmat CompanycontrolsArizona Portland Cement CompanyoperatesRILLITO PLANT
msha-controller-operator-history · controller/operator co-tenure derived on mine 0201138—
California Portland Cement CompanycontrolsArizona Portland Cement CompanyoperatesRILLITO PLANT
msha-controller-operator-history · controller/operator co-tenure derived on mine 0201138Other 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
117 historical accident/injury rows; 1 coded fatalities and 844 lost days across the published record.
ACCIDENT + INJURY RECORD12 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
746 violation rows across the full record; 144 carry an S&S flag and $170,598 appears in current assessed amounts.
ENFORCEMENT ACTIVITY95 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
56 personal. 1 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 EXPOSURE56 samples
personal-health-samples04 / PRODUCTIONcontext
Quarterly production and employment
68K employee hours and 126 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
25 contested-violation rows, 23 civil-penalty docket/decision rows, and 29 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE77 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 CONTEXT24 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
95 inspection events and 5K published inspection hours across the historical record.
OVERSIGHT COVERAGE20 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 13, 2026. 12 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 |
|---|---|---|---|---|---|
| 000000202601180600 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Utility Man | 0× published limitConcentration: 0000.25 · limit: 0000.00Source unit unspecified | Not reported | NO ACTIONInspection 6949056 |
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 56.12004Electrical conductors.1 recent row ↗30 CFR 56.12028Testing grounding systems.5 recent rows ↗30 CFR 56.14132Horns and backup alarms.1 recent row ↗30 CFR 56.11002Handrails and toeboards.1 recent row ↗30 CFR 56.20003Housekeeping.2 recent rows ↗30 CFR 56.12006Distribution boxes.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.
515184156.12004Citation
515184056.12028Citation
515183956.14132(a)Citation
504691056.11002Citation
522125656.20003(a)S&S
522125556.12006Citation
522125456.20003(a)Citation
515183856.12028Citation
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, <.1mgFront-end Loader Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Nuisance dust, respirable, <1% QtzMechanic
C/E: 00.02Concentration: 0000.20 · limit: 0010.00Source unit unspecified
Respirable dust, <.1mgWelder, etc.
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzLaborer, Bullgang
C/E: 00.00Concentration: 0001.06 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgElectrician
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Nuisance dust, respirable, <1% QtzUtility Man
C/E: 00.01Concentration: 0000.12 · limit: 0010.00Source unit unspecified
SOURCE COVERAGE
Reporting dates and coverage
15 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors117Jan 8, 2000—Sep 3, 2026mine-keyed
Addresses of Recordidentity · logistics1Aug 18, 1972—Aug 18, 1972mine-keyed
Assessed Violationscompliance · legal732Apr 4, 2000—Feb 19, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal23Apr 15, 2005—Jan 25, 2017mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal29Apr 11, 2002—Apr 2, 2012mine-keyed
Contested Violationscompliance · legal25Oct 28, 2002—Mar 1, 2016mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety3,800Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety833Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance3Jan 1, 1950—Oct 1, 1990mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance212Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance54Not published—Not publishedmine-keyed
Inspectionssafety · compliance95Apr 3, 2000—Sep 15, 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 · safety56Feb 13, 2003—Mar 19, 2026mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal746Apr 4, 2000—Aug 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.