MINE DETAILS
Columbus Junction Underground Mine
MSHA MINE ID1300194
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Columbus Junction Underground Mine41.24889, -91.42250Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-17. MSHA quarterly production and employment reports.
Coal production
—reported short tons
Hours worked
—reported employee hours
Tons per hour
—production ÷ 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 | — | — | — | — | No report |
| 2025 Q2 | — | — | — | — | No report |
| 2025 Q3 | — | — | — | — | No report |
| 2025 Q4 | — | — | — | — | No report |
| 2026 Q1 | — | — | — | — | No report |
| 2026 Q2 | — | — | — | — | No report |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-17
Violations
100 significant & substantial (S&S)
Accident records
20 records classified as fatality
Proposed penalties · USD
1,584.009 of 10 violations with amounts
On-site inspection hours
107.0010 inspections · 10 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 | 151.00 | 0 | 0 | 2 | 15.3 |
| 2025-Q2 | 4 | 0 | 679.00 | 0 | 0 | 1 | 33.5 |
| 2025-Q3 | 2 | 0 | 151.00 | 1 | 0 | 2 | 31.0 |
| 2025-Q4 | 1 | 0 | 226.00 | 0 | 0 | 2 | 11.3 |
| 2026-Q1 | 1 | 0 | 226.00 | 0 | 0 | 1 | 6.5 |
| 2026-Q2 | 1 | 0 | 151.00 | 1 | 0 | 1 | 5.8 |
| 2026-Q3 | 0 | 0 | — | 0 | 0 | 1 | 3.8 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
Regular Safety and Health Inspection · 3.8 on-site hours
50.10(d) · $151.00 proposed
Regular Safety and Health Inspection · 5.8 on-site hours
INUNDATION · ACCIDENT ONLY
Accident narrative
7000-1 filed 7/23/25 for original event. mine has remained inaccessible since flood date. K order issued. Water levels in creek and pit have been highly variable over time. this rain event raised existing water levels. Berms placed to prevent pit access. No mine entry since July 21, 2025. 0 injuries occurred. report filed to abate Citation 5118900
57.12028 · $226.00 proposed
Regular Safety and Health Inspection · 6.5 on-site hours
Spot Inspection · 2.8 on-site hours
57.12008 · $226.00 proposed
Regular Safety and Health Inspection · 8.5 on-site hours
Spot Inspection · 8.0 on-site hours
Description not reported
INUNDATION · ACCIDENT ONLY
Accident narrative
Extreme flooding event caused unexpected water in the mine. Mine is inaccessible and investigation/remediation is ongoing. No personnel allowed in mine until fully cleared to do so. NO INJURIES
49.4(d)(3) · $151.00 proposed
Regular Safety and Health Inspection · 23.0 on-site hours
57.12008 · $226.00 proposed
57.12008 · $151.00 proposed
57.14100(b) · $151.00 proposed
57.14100(b) · $151.00 proposed
Regular Safety and Health Inspection · 33.5 on-site hours
Compliance Follow-up Inspection · 2.0 on-site hours
57.4131(c) · $151.00 proposed
Regular Safety and Health Inspection · 13.3 on-site hours
Safety sources and definitions
MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-17.
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.
—
Thomas R Scott et alcontrolsRiver Products Company IncoperatesColumbus Junction Underground Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 1300194Other 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
25 historical accident/injury rows; 0 coded fatalities and 505 lost days across the published record.
ACCIDENT + INJURY RECORD9 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
338 violation rows across the full record; 60 carry an S&S flag and $70,761 appears in current assessed amounts.
ENFORCEMENT ACTIVITY74 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
261 personal; 14 area. 18 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 EXPOSURE275 samples
personal-health-samplesarea-samples04 / PRODUCTIONcontext
Quarterly production and employment
10K employee hours and 18 summed average employees across reported subunits in the latest published quarter.
2002-Q40 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
8 contested-violation rows, 7 civil-penalty docket/decision rows, and 41 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE56 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
156 inspection events and 4K published inspection hours across the historical record.
OVERSIGHT COVERAGE37 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 17, 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 50.10Immediate notification.1 recent row ↗30 CFR 57.12028Testing grounding systems.2 recent rows ↗30 CFR 57.12008Insulation and fittings for power wires and cables.3 recent rows ↗30 CFR 49.4Alternative mine rescue capability for special mining conditions.1 recent row ↗30 CFR 57.14100Safety defects; examination, correction and records.2 recent rows ↗30 CFR 57.4131Surface fan installations and mine openings.1 recent row ↗30 CFR 57.4503Conveyor belt slippage.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
511890050.10(d)Citation
511883757.12028Citation
511882257.12008Citation
8944929—Order
894491649.4(d)(3)Citation
894490557.12008Citation
894490457.12008Citation
894490357.14100(b)Citation
Coal dust, noise and other contaminants. Silica records above ↑
TC from EC @ 160Mucking Mach. Operator
C/E: 00.00Concentration: 0000.00 · limit: 0160.00Source unit unspecified
TC @ 160Mucking Mach. Operator
C/E: 00.00Concentration: 0000.00 · limit: 0160.00Source unit unspecified
ORGANIC CARBONMucking Mach. Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
EC @ 160Mucking Mach. Operator
C/E: 00.00Concentration: 0000.00 · limit: 0160.00Source unit unspecified
TC from EC @ 160Cleanup Man
C/E: 00.00Concentration: 0000.00 · limit: 0160.00Source unit unspecified
TC @ 160Cleanup Man
C/E: 00.00Concentration: 0000.00 · limit: 0160.00Source unit unspecified
ORGANIC CARBONCleanup Man
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
EC @ 160Cleanup Man
C/E: 00.00Concentration: 0000.00 · limit: 0160.00Source unit unspecified
SOURCE COVERAGE
Reporting dates and coverage
16 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors25Dec 22, 2000—Apr 3, 2026mine-keyed
Addresses of Recordidentity · logistics1Nov 5, 2025—Nov 5, 2025mine-keyed
Assessed Violationscompliance · legal336Feb 23, 2000—Apr 23, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal7Jan 25, 2010—Sep 7, 2011mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal41Jun 7, 2001—Aug 7, 2024mine-keyed
Contested Violationscompliance · legal8Mar 12, 2009—May 25, 2010mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety233Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety70Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance1Jan 1, 1950—Jan 1, 1950mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance48Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance108Not published—Not publishedmine-keyed
Inspectionssafety · compliance156Feb 22, 2000—Jul 27, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety14Jun 9, 2021—Nov 27, 2024mine-keyed
Metal and Nonmetal Personal Health Sampleshealth · safety261Sep 5, 2002—Nov 27, 2024mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal338Feb 23, 2000—Apr 23, 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.