Mine Safety — Reporting of Shutdowns and Patterns of Violations

Filed by mine operators required by Dodd-Frank to disclose certain safety orders and patterns of violations from MSHA. Rare outside the mining sector.

Recent disclosures

• May 19, 2026 20:02 UTC CNR Core Natural Resources, Inc. regulatory

  Core Natural Resources receives vacated MSHA imminent danger order at Leer South mine

• May 15, 2026 20:15 UTC AMR Alpha Metallurgical Resources, Inc. regulatory

  Alpha Metallurgical subsidiary receives MSHA imminent danger order at Road Fork #52 mine for methane accumulation

• May 04, 2026 23:59 UTC CNR Core Natural Resources, Inc. regulatory

  Core Natural Resources subsidiary receives imminent danger order at Mountaineer II mine for methane

• May 01, 2026 23:59 UTC CRH CRH PUBLIC LTD CO regulatory

  CRH subsidiary receives MSHA imminent danger order at Oklahoma quarry; resolved without injury

• Apr 07, 2026 23:59 UTC ARLP ALLIANCE RESOURCE PARTNERS LP regulatory

  ARLP subsidiary receives MSHA imminent danger order at River View Mine, resolved same day

• Mar 27, 2026 23:59 UTC HNRG HALLADOR ENERGY CO regulatory

  Hallador subsidiary receives MSHA imminent danger order at Oaktown Mine No. 1; company contests

• Mar 04, 2026 23:59 UTC CRH CRH PUBLIC LTD CO regulatory

  CRH subsidiary APAC-Kansas received MSHA imminent danger order at Harrisonville Quarry

• Feb 13, 2026 23:59 UTC MLM MARTIN MARIETTA MATERIALS INC regulatory

  Martin Marietta receives MSHA 107(a) order at Kokomo Quarry for fall-protection violation

• Feb 09, 2026 23:59 UTC AMRZ Amrize Ltd regulatory

  Amrize Ltd receives MSHA imminent danger order at Ravena cement plant due to ladder incident

• Jan 22, 2026 23:59 UTC AMRZ Amrize Ltd regulatory

  Amrize receives MSHA imminent danger order at Ravena cement plant due to fall hazard

• Jan 16, 2026 23:59 UTC FCX FREEPORT-MCMORAN INC regulatory

  Freeport-McMoRan Receives MSHA Imminent Danger Order at Morenci Mine

• Jan 12, 2026 23:59 UTC CNR Core Natural Resources, Inc. regulatory

  Core Natural Resources subsidiary receives imminent danger order at Mountaineer II mine due to elevated methane

• Dec 16, 2025 23:59 UTC ACA Arcosa, Inc. regulatory

  Arcosa receives MSHA 107(a) order at DeRidder, LA aggregate site; terminated quickly, no injuries

• Dec 08, 2025 23:59 UTC VMC Vulcan Materials CO regulatory

  MSHA issues imminent danger order at Vulcan's Norcross Quarry after driver seen without fall protection

• Sep 19, 2025 23:59 UTC AMR Alpha Metallurgical Resources, Inc. regulatory

  Alpha Metallurgical subsidiary receives MSHA imminent danger order at Deep Mine 46; order terminated, no injuries

• Sep 10, 2025 23:59 UTC FCX FREEPORT-MCMORAN INC regulatory

  MSHA issued imminent danger order at Freeport's Henderson mine; resolved without injuries

• Aug 01, 2025 23:59 UTC HCC WARRIOR MET COAL, INC. regulatory

  Warrior Met Coal subsidiary receives MSHA imminent danger order at Blue Creek mine

• Jun 20, 2025 23:59 UTC VMC Vulcan Materials CO regulatory

  MSHA issues imminent danger order at Vulcan's Clear Creek Quarry; no injuries, order terminated

• Apr 22, 2025 23:59 UTC MTZ MASTEC INC regulatory

  MasTec sub receives MSHA imminent danger order at NM mine; resolved

• Mar 21, 2025 23:59 UTC VMC Vulcan Materials CO regulatory

  Vulcan Materials receives MSHA imminent danger order at Liberty Quarry for fall-protection violation

• Mar 07, 2025 23:59 UTC GVA GRANITE CONSTRUCTION INC regulatory

  Granite Construction receives MSHA imminent danger order at Ukiah facility; no injury

source · SEC Form 8-K instructions · see methodology