Carmeuse Holding SA safety activity
MSHA violations, accident reports and inspections across the current mine portfolio.
Safety activity
Identification of power switches.
O-N Minerals - Calcite Operation · 200006230 CFR 56.12018 · $267.00 proposed penalty
Annual refresher training.
O-N Minerals - Calcite Operation · 200006230 CFR 46.8 · $168.00 proposed penalty
Protection of gas cylinder valves.
O-N Minerals - Calcite Operation · 200006230 CFR 56.16006 · $267.00 proposed penalty
Inspection and cover plates.
O-N Minerals - Calcite Operation · 200006230 CFR 56.12032 · $267.00 proposed penalty
Protection for openings around travelways.
O-N Minerals - Calcite Operation · 200006230 CFR 56.11012 · $151.00 proposed penalty
Regular Safety and Health Inspection
Maysville Mine · 1507101142.3 on-site hours reported
Slip or fall of person
Middletown Quarry · 4400049Days restricted activity only
Accident narrative
EE states that while pulling water hose to back to hose reel on water truck that the EE's foot hooked a frozen clump of material, causing a fall to the ground on EE's left side. EE was seen at urgent care and was issued restrictions due to limited mobility and pain in left shoulder and left thigh.
Slip or fall of person
O-N Minerals - Calcite Operation · 2000062No dys awy frm wrk,no rstr act
Accident narrative
EE slipped down an icy stair way and landed on their arm, resulting in a dislocated shoulder.
Hoisting
Maysville Mine · 1507101Accident only
Accident narrative
On 12/18/2025 the vertical shaft hoist (primary escapeway) was taken out of service due to not being able to close the surface landing door. No miners were in the mine when this issue was found. It was determined a bolt on the landing door track needed replaced.
Handling of materials
Underground Black River Operation · 1500062Days away from work only
Accident narrative
EE on 12/16/2025 reporting back pain, due to an injury on 12/13/2025. They started changing a return roller and felt pain and reported to supervisor, but thought was going to be alright. On 12/16/2025 employee is requesting medical care and taken to local ER.
Inspection.
Maple Grove Operations · 330001330 CFR 56.4201(a)(2) · $151.00 proposed penalty
Testing grounding systems.
Maple Grove Operations · 330001330 CFR 56.12028 · $151.00 proposed penalty
Distribution boxes.
Maple Grove Operations · 330001330 CFR 56.12006 · $398.00 proposed penalty
Falling/sliding/rolling materials
O-N Minerals - Calcite Operation · 2000062Days restricted activity only
Accident narrative
EE was on the 5th floor of the mill washing when a rock (4" + size) came down from the 6th floor striking EE on the Left Elbow
Distribution boxes.
Maple Grove Operations · 330001330 CFR 56.12006 · $151.00 proposed penalty
Housekeeping.
O-N Minerals, Cedarville Operation · 200006130 CFR 56.20003(a) · Significant and substantial (S&S) · $9,757.00 proposed penalty
Hand-held power tools.
O-N Minerals, Cedarville Operation · 200006130 CFR 56.14116(a) · $267.00 proposed penalty
Distribution boxes.
Maple Grove Operations · 330001330 CFR 56.12006 · $151.00 proposed penalty
Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.
Maple Grove Operations · 330001330 CFR 50.30(a) · $151.00 proposed penalty
Hoisting
Maysville Mine · 1507101Accident only
Accident narrative
On 12/1/2025 MSHA was notified that the vertical shaft hoist was being taken out of service due to intermittent issues. The brake alarm was resolved after adjustment per manufacturer specification. There was also a problem with a control wire, which was changed out with a spare. No miners were injured due to this incident.
Regular Safety and Health Inspection
O-N Minerals, Cedarville Operation · 200006119.0 on-site hours reported
Regular Safety and Health Inspection
Maple Grove Operations · 330001367.3 on-site hours reported
Compliance Follow-up Inspection
Underground Black River Operation · 15000620.0 on-site hours reported
Training plans; time of submission; where filed; information required; time for approval; method for disapproval; commencement of training; approval of instructors.
Underground Black River Operation · 150006230 CFR 48.3(e) · $151.00 proposed penalty
Regular Safety and Health Inspection
Nixon Road · 20035524.5 on-site hours reported
Sources and definitions
MSHA Violations (issue date), Accidents (accident date) and Inspections (begin date).
Violation titles use current CFR headings to identify the cited rule; they are not the inspector’s account of what happened.
Status is from the current MSHA Mines snapshot, not the selected reporting period. Closed records can retain their last reported controller/operator.
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.