No 4 Mine safety activity
MSHA violations, accident reports and inspections.
Safety activity
Drill dust control at underground areas of underground mines.
30 CFR 72.630(b) · Significant and substantial (S&S)
Mine ventilation plan; submission and approval.
30 CFR 75.370(a)(1) · $313.00 proposed penalty
Mine ventilation plan; submission and approval.
30 CFR 75.370(a)(1) · Significant and substantial (S&S) · $1,550.00 proposed penalty
Mine ventilation plan; submission and approval.
30 CFR 75.370(a)(1) · $313.00 proposed penalty
Ventilation Technical Investigation
38.3 on-site hours reported
Fall of roof or back
Accident only
Accident narrative
Unplanned roof fall has occurred at the South Portal, spad station #057, one crosscut from 4-2 shaft/hoist. The roof has fell above the anchorage point of primary support.
Non-Injury Accident Investigation
1.8 on-site hours reported
Spot Inspections
103(i) · 6.8 on-site hours reported
Protection from falls of roof, face and ribs.
30 CFR 75.202(a) · Significant and substantial (S&S)
Violation — cited standard not reported
Protection from falls of roof, face and ribs.
30 CFR 75.202(a) · Significant and substantial (S&S) · $2,503.00 proposed penalty
Accumulation of combustible materials.
30 CFR 75.400 · $504.00 proposed penalty
Protection from falls of roof, face and ribs.
30 CFR 75.202(a) · Significant and substantial (S&S) · $2,712.00 proposed penalty
Protection from falls of roof, face and ribs.
30 CFR 75.202(a) · Significant and substantial (S&S) · $2,503.00 proposed penalty
Protection from falls of roof, face and ribs.
30 CFR 75.202(a) · $504.00 proposed penalty
Ventilation controls.
30 CFR 75.333(c)(3) · $245.00 proposed penalty
Protection from falls of roof, face and ribs.
30 CFR 75.202(a) · $504.00 proposed penalty
Roof bolting.
30 CFR 75.204(c)(1) · $288.00 proposed penalty
Accumulation of combustible materials.
30 CFR 75.400 · $504.00 proposed penalty
Spot Inspections
103(i) · 6.0 on-site hours reported
Preshift examination at fixed intervals.
30 CFR 75.360(h)
Maintenance of belt conveyors and belt conveyor entries.
30 CFR 75.1731(a) · Significant and substantial (S&S) · $1,431.00 proposed penalty
Maintenance of belt conveyors and belt conveyor entries.
30 CFR 75.1731(b) · Significant and substantial (S&S) · $1,320.00 proposed penalty
Accumulation of combustible materials.
30 CFR 75.400 · Significant and substantial (S&S) · $2,503.00 proposed penalty
Spot Inspections
103(i) · 9.0 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.
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.