Martin Marietta Materials, Inc. safety activity
MSHA violations, accident reports and inspections across the current mine portfolio.
Safety activity
Impoundment Spot Inspection
Spec Agg Quarry · 05008601.5 on-site hours reported
Regular Safety and Health Inspection
Louisburg Quarry · 14008236.5 on-site hours reported
Handrails and toeboards.
Plant #65 · 230192230 CFR 56.11002 · $151.00 proposed penalty
Moving machine parts.
Plant #65 · 230192230 CFR 56.14107(a) · $151.00 proposed penalty
Spillage and leakage.
Plant #65 · 230192230 CFR 56.4102 · Significant and substantial (S&S) · $288.00 proposed penalty
Flying or falling materials.
Fort Calhoun Underground Mine · 250130030 CFR 57.14110 · $151.00 proposed penalty
Construction and maintenance of ventilation doors.
Fort Calhoun Underground Mine · 250130030 CFR 57.8531(c) · $151.00 proposed penalty
Handling of materials
Fort Calhoun Underground Mine · 2501300Days restricted activity only
Accident narrative
Employee attempted to move a drill steel and felt a pop in the left elbow. Was not reported until one week later. Injury became reportable when surgery was performed on 07/08/2026
Impoundment Spot Inspection
Plant #65 · 23019225.3 on-site hours reported
Compliance Follow-up Inspection
Granite Canyon Quarry · 48000181.3 on-site hours reported
Retaining dams.
Plant #65 · 230192230 CFR 56.20010 · $193.00 proposed penalty
Impoundment Spot Inspection
NATIVIDAD PLANT · 04001563.8 on-site hours reported
Regular Safety and Health Inspection
Plant #65 · 230192222.3 on-site hours reported
Compliance Follow-up Inspection
New Melle Mine · 23020432.5 on-site hours reported
Regular Safety and Health Inspection
Weeping Water Mine · 250099882.3 on-site hours reported
Regular Safety and Health Inspection
Fort Calhoun Underground Mine · 250130033.5 on-site hours reported
Verbal Hazard Complaint Inspections
Anderson Mine and Mill · 400002216.0 on-site hours reported
Regular Safety and Health Inspection
Anderson Creek Quarry · 440296326.8 on-site hours reported
Compliance Follow-up Inspection
Crawford Mine & Mill · 41009911.0 on-site hours reported
Compliance Follow-up Inspection
Lotawana Quarry · 23018891.0 on-site hours reported
Identification of power switches.
AUBURN QUARRY · 090043630 CFR 56.12018 · $151.00 proposed penalty
Safety defects; examination, correction and records.
Denver Quarry · 310197130 CFR 56.14100(b) · $151.00 proposed penalty
Distribution boxes.
Marble Falls Plant · 410319030 CFR 56.12006 · $1,431.00 proposed penalty
Electrical conductors.
Marble Falls Plant · 410319030 CFR 56.12004 · Significant and substantial (S&S) · $7,084.00 proposed penalty
Inspection and cover plates.
Marble Falls Plant · 410319030 CFR 56.12032 · $432.00 proposed penalty
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.