MINE DETAILS
USMC Ione Plant
MSHA MINE ID0401878
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- USMC Ione Plant38.33417, -120.94639Open 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
306,616reported 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 | 59,555 | 0.00 | 113 | 1/1 mines reporting |
| 2025 Q2 | 0 | 61,188 | 0.00 | 111 | 1/1 mines reporting |
| 2025 Q3 | 0 | 64,242 | 0.00 | 113 | 1/1 mines reporting |
| 2025 Q4 | 0 | 44,613 | 0.00 | 98 | 1/1 mines reporting |
| 2026 Q1 | 0 | 38,959 | 0.00 | 88 | 1/1 mines reporting |
| 2026 Q2 | 0 | 38,059 | 0.00 | 84 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
15130 significant & substantial (S&S)
Accident records
40 records classified as fatality
Proposed penalties · USD
254,117.00149 of 151 violations with amounts
On-site inspection hours
209.0017 inspections · 17 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 | 1 | 0 | 366.00 | 1 | 0 | 1 | 5.5 |
| 2025-Q2 | 31 | 5 | 76,421.00 | 2 | 0 | 2 | 33.5 |
| 2025-Q3 | 7 | 0 | 8,656.00 | 1 | 0 | 2 | 25.5 |
| 2025-Q4 | 49 | 2 | 37,569.00 | 0 | 0 | 4 | 28.8 |
| 2026-Q1 | 3 | 0 | 2,087.00 | 0 | 0 | 4 | 26.0 |
| 2026-Q2 | 60 | 23 | 129,018.00 | 0 | 0 | 4 | 89.8 |
| 2026-Q3 | 0 | 0 | — | 0 | 0 | 0 | — |
| 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 · 1.5 on-site hours
Compliance Follow-up Inspection · 3.0 on-site hours
56.11002 · $245.00 proposed
56.11012 · $245.00 proposed
56.11005 · $165.00 proposed
56.11012 · $245.00 proposed
56.11005 · $245.00 proposed
56.4200(b)(2) · $549.00 proposed
56.4200(b)(2) · $549.00 proposed
56.4200(b)(2) · S&S · $2,712.00 proposed
56.4200(b)(2) · S&S · $2,712.00 proposed
56.14205 · $549.00 proposed
56.20003(a)
56.20003(c)
56.11027 · S&S · $2,712.00 proposed
56.14112(a)(1) · S&S · $1,818.00 proposed
56.20003(a) · S&S · $1,818.00 proposed
56.20003(a) · S&S · $2,021.00 proposed
56.20003(a) · $165.00 proposed
56.14107(a) · $592.00 proposed
56.12004 · S&S · $21,713.00 proposed
56.20003(c) · $407.00 proposed
56.12004 · $4,383.00 proposed
56.14201(b) · $245.00 proposed
56.20003(a) · S&S · $1,818.00 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.
—
John Bremer et alcontrolsUS Mine CorpoperatesUSMC Ione Plant
msha-controller-operator-history · controller/operator co-tenure derived on mine 0401878—
Brady Barto et alcontrolsUS Mine CorpoperatesUSMC Ione Plant
msha-controller-operator-history · controller/operator co-tenure derived on mine 0401878—
Covia Holdings LLCcontrolsUnimin CorpoperatesUSMC Ione Plant
msha-controller-operator-history · controller/operator co-tenure derived on mine 0401878—
A Scott DocktercontrolsUS Mine CorpoperatesUSMC Ione Plant
msha-controller-operator-history · controller/operator co-tenure derived on mine 0401878—
S C R-Sibelco Nv et alcontrolsUnimin CorpoperatesUSMC Ione Plant
msha-controller-operator-history · controller/operator co-tenure derived on mine 0401878—
Owens Illinois InccontrolsOi Ione Sts IncoperatesUSMC Ione Plant
msha-controller-operator-history · controller/operator co-tenure derived on mine 0401878Other 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
58 historical accident/injury rows; 0 coded fatalities and 2,201 lost days across the published record.
ACCIDENT + INJURY RECORD20 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
669 violation rows across the full record; 150 carry an S&S flag and $652,132 appears in current assessed amounts.
ENFORCEMENT ACTIVITY309 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
113 personal; 84 area. 3 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 EXPOSURE197 samples
personal-health-samplesarea-samples04 / PRODUCTIONcontext
Quarterly production and employment
38K employee hours and 84 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
35 contested-violation rows, 37 civil-penalty docket/decision rows, and 18 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE90 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 CONTEXT11 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
109 inspection events and 3K published inspection hours across the historical record.
OVERSIGHT COVERAGE43 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 |
|---|---|---|---|---|---|
| 000000202601761100 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Forklift Operator | 0.76× published limitConcentration: 0001.31 · limit: 0001.72Source unit unspecified | Not reported | NO ACTIONInspection F029BCB |
| 000000202601511100 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Dry Screen Plant Operator | 0.47× published limitConcentration: 0000.65 · limit: 0001.37Source unit unspecified | Not reported | NO ACTIONInspection F034D57 |
| 000000202601511200 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Dry Screen Plant Operator | 0.48× published limitConcentration: 0000.77 · limit: 0001.59Source unit unspecified | Not reported | NO ACTIONInspection F034D57 |
| 000000202601150200 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Front-end Loader Operator | 0.23× published limitConcentration: 0000.21 · limit: 0000.92Source unit unspecified | Not reported | NO ACTIONInspection F037D77 |
| 000000202600260400 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Dry Screen Plant Operator | 3.84× published limitConcentration: 0009.15 · limit: 0002.38Source unit unspecified | Not reported | CITATION/ORDER EXTENDEDInspection F021E55 |
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 56.11002Handrails and toeboards.1 recent row ↗30 CFR 56.11012Protection for openings around travelways.2 recent rows ↗30 CFR 56.11005Fixed ladder anchorage and toe clearance.2 recent rows ↗30 CFR 56.4200General requirements.4 recent rows ↗30 CFR 56.14205Machinery, equipment, and tools.1 recent row ↗30 CFR 56.20003Housekeeping.2 recent rows ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
510665056.11002Citation
510664956.11012Citation
510664856.11005Citation
510664756.11012Citation
510664656.11005Citation
510664556.4200(b)(2)Citation
510664456.4200(b)(2)Citation
510664356.4200(b)(2)S&S
Coal dust, noise and other contaminants. Silica records above ↑
Respirable dust, <.1mgBulldozer Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgCleanup Man
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgScraper Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgKiln/Dryer Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Zinc oxide fumesPipe Fitter/Millright/Plumber
C/E: 00.00Concentration: 0000.00 · limit: 0005.00Source unit unspecified
SOURCE COVERAGE
Reporting dates and coverage
16 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors58Sep 18, 2000—Aug 6, 2025mine-keyed
Addresses of Recordidentity · logistics1Nov 6, 2016—Nov 6, 2016mine-keyed
Assessed Violationscompliance · legal658Feb 8, 2000—Apr 29, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal37Jun 25, 2004—Aug 26, 2025mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal18May 7, 2001—Feb 5, 2025mine-keyed
Contested Violationscompliance · legal35Jul 18, 2006—Apr 21, 2026mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety608Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety141Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance6Jan 1, 1950—Aug 31, 2015mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance198Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance52Not published—Not publishedmine-keyed
Inspectionssafety · compliance109Feb 8, 2000—May 21, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety84Jan 11, 2022—Jan 11, 2022mine-keyed
Metal and Nonmetal Personal Health Sampleshealth · safety113Apr 24, 2001—Apr 22, 2026mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal669Feb 8, 2000—Apr 29, 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.