MINE DETAILS
O-N Minerals - Calcite Operation
MSHA MINE ID2000062
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- O-N Minerals - Calcite Operation45.41556, -83.80250Open 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
468,142reported 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 | 71,502 | 0.00 | 148 | 1/1 mines reporting |
| 2025 Q2 | 0 | 87,081 | 0.00 | 152 | 1/1 mines reporting |
| 2025 Q3 | 0 | 85,066 | 0.00 | 153 | 1/1 mines reporting |
| 2025 Q4 | 0 | 67,954 | 0.00 | 154 | 1/1 mines reporting |
| 2026 Q1 | 0 | 71,241 | 0.00 | 148 | 1/1 mines reporting |
| 2026 Q2 | 0 | 85,298 | 0.00 | 151 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
407 significant & substantial (S&S)
Accident records
130 records classified as fatality
Proposed penalties · USD
16,096.0040 of 40 violations with amounts
On-site inspection hours
274.257 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 | 0 | 0 | — | 2 | 0 | 1 | 1.8 |
| 2025-Q2 | 18 | 2 | 5,557.00 | 2 | 0 | 1 | 106.8 |
| 2025-Q3 | 0 | 0 | — | 2 | 0 | 1 | 1.8 |
| 2025-Q4 | 0 | 0 | — | 3 | 0 | 0 | — |
| 2026-Q1 | 13 | 3 | 6,962.00 | 2 | 0 | 2 | 77.0 |
| 2026-Q2 | 9 | 2 | 3,577.00 | 1 | 0 | 2 | 87.0 |
| 2026-Q3 | 0 | 0 | — | 1 | 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
POWERED HAULAGE · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
ee lost control of haul truck and ran up a berm causing the haul truck to roll onto its side. ee sustained laceration to ear requiring stitches and bruising on leg.
Impoundment Spot Inspection · 2.5 on-site hours
56.14101(a)(2) · $245.00 proposed
56.15005 · S&S · $1,219.00 proposed
56.14107(a) · $245.00 proposed
56.4603(b) · $165.00 proposed
47.44(b) · $165.00 proposed
56.4201(a)(2) · $193.00 proposed
56.14109(a) · $193.00 proposed
56.20003(a) · $193.00 proposed
Regular Safety and Health Inspection · 84.5 on-site hours
56.20003(a) · S&S · $959.00 proposed
HANDLING OF MATERIALS · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
EE was installing idler. Pushed on idler to put bolt in to hold idler from moving EE felt a pop in their right wrist. Medical treatment sought. Work restrictions issued due to sprain.
HANDLING OF MATERIALS · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
EE was moving an idler for conveyor. One end was in the air and fell on EE left foot missing the steel toe of EE's boot by an inch. Idler is 82" long by 6" wide.
Impoundment Spot Inspection · 2.8 on-site hours
HANDLING OF MATERIALS · DAYS AWAY FROM WORK ONLY
Accident narrative
EEs were in the process of removing old belting. Roughly 30lbs of belting per piece. EE lifted the old belting up with assistance from another EE onto a cart to take out of tunnel. When they bent over to pick up another piece they felt a sharp pain across their lower back.
56.20003(a) · $151.00 proposed
56.12017 · $267.00 proposed
56.12004 · $398.00 proposed
56.14100(b) · $151.00 proposed
56.11012 · S&S · $1,320.00 proposed
56.16006 · $267.00 proposed
56.20003(a) · S&S · $1,320.00 proposed
56.14115(b) · S&S · $1,968.00 proposed
Regular Safety and Health Inspection · 74.3 on-site hours
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.
—
Oglebay Norton CompanycontrolsO-N Minerals (Michigan) CompanyoperatesO-N Minerals - Calcite Operation
msha-controller-operator-history · controller/operator co-tenure derived on mine 2000062—
Carmeuse Holding SAcontrolsO-N Minerals (Michigan) CompanyoperatesO-N Minerals - Calcite Operation
msha-controller-operator-history · controller/operator co-tenure derived on mine 2000062—
Carmeuse Holding SAcontrolsCarmeuse Lime Inc - Calcite OperationoperatesO-N Minerals - Calcite Operation
msha-controller-operator-history · controller/operator co-tenure derived on mine 2000062—
Carmeuse Holding SAcontrolsO-N Minerals (Michigan) CompanyoperatesO-N Minerals - Calcite Operation
msha-controller-operator-history · controller/operator co-tenure derived on mine 2000062—
Oglebay Norton CompanycontrolsO-N Minerals (Michigan) CompanyoperatesO-N Minerals - Calcite Operation
msha-controller-operator-history · controller/operator co-tenure derived on mine 2000062—
Michigan Mnrls Associates Inc et alcontrolsMichigan Limestone Operations-Ltd PartnershipoperatesO-N Minerals - Calcite Operation
msha-controller-operator-history · controller/operator co-tenure derived on mine 2000062—
USX Corp (United States Steel Corp)controlsUsx CorpoperatesO-N Minerals - Calcite Operation
msha-controller-operator-history · controller/operator co-tenure derived on mine 2000062Other 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
200 historical accident/injury rows; 0 coded fatalities and 3,284 lost days across the published record.
ACCIDENT + INJURY RECORD45 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
976 violation rows across the full record; 123 carry an S&S flag and $239,804 appears in current assessed amounts.
ENFORCEMENT ACTIVITY198 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
156 personal; 1 area. 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 EXPOSURE157 samples
personal-health-samplesarea-samples04 / PRODUCTIONcontext
Quarterly production and employment
85K employee hours and 151 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
22 contested-violation rows, 25 civil-penalty docket/decision rows, and 40 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE87 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 CONTEXT39 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
113 inspection events and 8K published inspection hours across the historical record.
OVERSIGHT COVERAGE27 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 13, 2026. 5 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 56.14101Brakes.1 recent row ↗30 CFR 56.15005Safety belts and lines.1 recent row ↗30 CFR 56.14107Moving machine parts.1 recent row ↗30 CFR 56.4603Closure of valves.1 recent row ↗30 CFR 47.44Temporary, portable containers.1 recent row ↗30 CFR 56.4201Inspection.1 recent row ↗30 CFR 56.14109Unguarded conveyors with adjacent travelways.1 recent row ↗30 CFR 56.20003Housekeeping.3 recent rows ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
511122756.14101(a)(2)Citation
511122656.15005S&S
511122356.14107(a)Citation
511122256.4603(b)Citation
511122147.44(b)Citation
511122056.4201(a)(2)Citation
511121956.14109(a)Citation
511121856.20003(a)Citation
Coal dust, noise and other contaminants. Silica records above ↑
Unlisted Particulate, respirable, <1% QtzDrill Operator, Rotary Air
C/E: 00.00Concentration: 0000.13 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgDrill Operator, Rotary Air
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzCrusher Oper/Worker
C/E: 00.00Concentration: 0006.16 · limit: 0000.00Source unit unspecified
Zinc oxide fumesWelder, etc.
C/E: 00.00Concentration: 0000.02 · limit: 0010.00Source unit unspecified
Vanadium fumesWelder, etc.
C/E: 00.00Concentration: 0000.00 · limit: 0050.00Source unit unspecified
Nickel fumesWelder, etc.
C/E: 00.00Concentration: 0000.00 · limit: 0003.00Source unit unspecified
Molybdenum fumesWelder, etc.
C/E: 00.00Concentration: 0000.00 · limit: 0020.00Source unit unspecified
Manganese fumesWelder, etc.
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 · contractors200Jan 12, 2000—Sep 21, 2026mine-keyed
Addresses of Recordidentity · logistics1Nov 2, 1993—Nov 2, 1993mine-keyed
Assessed Violationscompliance · legal973Feb 1, 2000—May 12, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal25Nov 13, 2002—May 13, 2024mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal40Mar 8, 2004—Feb 12, 2025mine-keyed
Contested Violationscompliance · legal22Feb 10, 2004—Mar 22, 2023mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety3,556Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety817Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance7Jan 1, 1950—Mar 4, 2008mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance318Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance81Not published—Not publishedmine-keyed
Inspectionssafety · compliance113Feb 1, 2000—Jun 10, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety1Jan 27, 2010—Jan 27, 2010mine-keyed
Metal and Nonmetal Personal Health Sampleshealth · safety156May 7, 2003—Sep 28, 2022mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal976Feb 1, 2000—May 12, 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.