Coal production
0reported short tons
ACTIVE / OPERATOR PORTFOLIO
O-N Minerals (Michigan) Company
Membership and operating status are from the latest MSHA Mines snapshot. Open a mine for its ownership history.
MSHA OPERATOR IDL17341
MINE PORTFOLIO
3 of 3 mines and facilities
2025-01-01 – 2026-10-18. Active records; production reporting is not required.
Material, method and type filters apply to this table. The portfolio’s status applies to the entire page. GEM fields describe their own release, not the selected MSHA year.
| Mine | Location / type | Coal · short tons | Hours worked | Violations | Accident records | On-site inspection hours |
|---|---|---|---|---|---|---|
| Carmeuse, Port Inland Operation2000985 · Active6/8 quarters reported | Schoolcraft, MISurface · MSHA: Crushed, Broken Limestone NEC | 0 | 255,309 | 14 | 1 | 121.3 |
| O-N Minerals - Calcite Operation2000062 · Active6/8 quarters reported | Presque Isle, MISurface · MSHA: Crushed, Broken Limestone NEC | 0 | 468,142 | 40 | 13 | 274.3 |
| O-N Minerals, Cedarville Operation2000061 · Active6/8 quarters reported | Mackinac, MISurface · MSHA: Crushed, Broken Limestone NEC | 0 | 253,588 | 39 | 4 | 156.0 |
Production and hours sum available quarterly reports. — means unavailable; zero safety records means none in the selected imported period. Ownership reflects the current MSHA record.
LOCATION
Portfolio map
3 of 3 mines with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Carmeuse, Port Inland Operation45.97139, -85.87194Open map ↗
- O-N Minerals - Calcite Operation45.41556, -83.80250Open map ↗
- O-N Minerals, Cedarville Operation46.04889, -84.31306Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-18. All 3 mines listed under this operator were checked; 3 have reports in the available quarters. Totals use current ownership.
Hours worked
977,039reported 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 | 137,018 | 0.00 | 299 | 3/3 mines reporting |
| 2025 Q2 | 0 | 192,865 | 0.00 | 340 | 3/3 mines reporting |
| 2025 Q3 | 0 | 181,992 | 0.00 | 349 | 3/3 mines reporting |
| 2025 Q4 | 0 | 140,093 | 0.00 | 331 | 3/3 mines reporting |
| 2026 Q1 | 0 | 131,671 | 0.00 | 293 | 3/3 mines reporting |
| 2026 Q2 | 0 | 193,400 | 0.00 | 348 | 3/3 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-18
Violations
9321 significant & substantial (S&S)
Accident records
180 records classified as fatality
Proposed penalties · USD
153,741.0093 of 93 violations with amounts
On-site inspection hours
551.5023 inspections · 23 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 | 9 | 0 | 1,359.00 | 3 | 0 | 5 | 47.8 |
| 2025-Q2 | 32 | 6 | 10,789.00 | 2 | 0 | 2 | 155.8 |
| 2025-Q3 | 3 | 3 | 1,079.00 | 3 | 0 | 2 | 34.0 |
| 2025-Q4 | 6 | 1 | 10,628.00 | 3 | 0 | 2 | 60.0 |
| 2026-Q1 | 20 | 8 | 120,899.00 | 4 | 0 | 6 | 98.0 |
| 2026-Q2 | 23 | 3 | 8,987.00 | 2 | 0 | 5 | 154.0 |
| 2026-Q3 | 0 | 0 | — | 1 | 0 | 1 | 2.0 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
- O-N Minerals - Calcite Operation · 2000062
56.20003(a) · S&S · $959.00 proposed
- Carmeuse, Port Inland Operation · 2000985
47.44(a)(2) · $151.00 proposed
- Carmeuse, Port Inland Operation · 2000985
56.4201(a)(1) · $151.00 proposed
- Carmeuse, Port Inland Operation · 2000985
Regular Safety and Health Inspection · 24.0 on-site hours
- Carmeuse, Port Inland Operation · 2000985
56.16006 · $151.00 proposed
- O-N Minerals, Cedarville Operation · 2000061
FALLING/SLIDING/ROLLING MATERIALS · DYS AWY FRM WRK & RESTRCTD ACT
Accident narrative
ee was standing in the center deck discharge lip and the center chute, which was folded up on its hinges, came down and landed on the ee's leg/ankle resulting in a fracture.
- O-N Minerals - Calcite Operation · 2000062
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.
- O-N Minerals, Cedarville Operation · 2000061
Compliance Follow-up Inspection · 5.8 on-site hours
- O-N Minerals - Calcite Operation · 2000062
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.
- O-N Minerals, Cedarville Operation · 2000061
Impoundment Spot Inspection · 3.0 on-site hours
- O-N Minerals, Cedarville Operation · 2000061
Spot Inspection · 6.3 on-site hours
- O-N Minerals, Cedarville Operation · 2000061
46.9(b)(5) · $151.00 proposed
- O-N Minerals, Cedarville Operation · 2000061
56.18002(b) · S&S · $4,047.00 proposed
- O-N Minerals - Calcite Operation · 2000062
Impoundment Spot Inspection · 2.8 on-site hours
- O-N Minerals, Cedarville Operation · 2000061
56.18002(a) · S&S · $29,904.00 proposed
- O-N Minerals, Cedarville Operation · 2000061
46.7(a) · S&S · $29,904.00 proposed
- O-N Minerals, Cedarville Operation · 2000061
56.15005 · S&S · $11,450.00 proposed
- O-N Minerals, Cedarville Operation · 2000061
56.11012 · S&S · $38,016.00 proposed
- O-N Minerals, Cedarville Operation · 2000061
56.15001 · $465.00 proposed
- O-N Minerals, Cedarville Operation · 2000061
103 (g) Written Notification Hazard Complaint Inspectio · 6.0 on-site hours
- O-N Minerals - Calcite Operation · 2000062
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.
- O-N Minerals, Cedarville Operation · 2000061
SLIP OR FALL OF PERSON · DAYS AWAY FROM WORK ONLY
Accident narrative
EE fell 10ft 10in while leaning out a 11-1/2 in opening between a screen and adjacent handrail trying to look at the screen springs.
- O-N Minerals - Calcite Operation · 2000062
56.20003(a) · $151.00 proposed
- O-N Minerals - Calcite Operation · 2000062
56.12017 · $267.00 proposed
- O-N Minerals - Calcite Operation · 2000062
56.12004 · $398.00 proposed
Safety sources and definitions
MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-18.
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.
SELECTED PORTFOLIO
1 linked controller.
Relationships reflect the selected mine status and current MSHA controller/operator fields.