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

• August 19, 2026, 5:09 PM ET NC NACCO INDUSTRIES INC regulatory

  NACCO subsidiary receives mine safety order at Freedom Mine

• July 31, 2026, 4:27 PM ET EME EMCOR Group, Inc. regulatory

  EMCOR subsidiary receives MSHA imminent danger order at Texas mine; no injuries

• July 15, 2026, 4:25 PM ET ACA Arcosa, Inc. regulatory

  Arcosa receives MSHA 107(a) order at Stavola Bound Brook Quarry; terminated same day

• June 3, 2026, 4:30 PM ET HNRG HALLADOR ENERGY CO regulatory

  Hallador subsidiary receives MSHA imminent danger order at Oaktown mine

• May 19, 2026, 4:02 PM ET CNR Core Natural Resources, Inc. regulatory

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

• May 15, 2026, 4:15 PM ET AMR Alpha Metallurgical Resources, Inc. regulatory

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

• May 4, 2026, 7:59 PM ET CNR Core Natural Resources, Inc. regulatory

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

• May 1, 2026, 7:59 PM ET CRH CRH PUBLIC LTD CO regulatory

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

• April 7, 2026, 7:59 PM ET ARLP ALLIANCE RESOURCE PARTNERS LP regulatory

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

• March 27, 2026, 7:59 PM ET HNRG HALLADOR ENERGY CO regulatory

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

• March 4, 2026, 6:59 PM ET CRH CRH PUBLIC LTD CO regulatory

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

• February 13, 2026, 6:59 PM ET MLM MARTIN MARIETTA MATERIALS INC regulatory

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

• February 9, 2026, 6:59 PM ET AMRZ Amrize Ltd regulatory

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

• January 22, 2026, 6:59 PM ET AMRZ Amrize Ltd regulatory

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

• January 16, 2026, 6:59 PM ET FCX FREEPORT-MCMORAN INC regulatory

  Freeport-McMoRan Receives MSHA Imminent Danger Order at Morenci Mine

• January 12, 2026, 6:59 PM ET CNR Core Natural Resources, Inc. regulatory

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

• December 16, 2025, 6:59 PM ET ACA Arcosa, Inc. regulatory

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

• December 8, 2025, 6:59 PM ET VMC Vulcan Materials CO regulatory

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

• September 19, 2025, 7:59 PM ET AMR Alpha Metallurgical Resources, Inc. regulatory

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

• September 10, 2025, 7:59 PM ET FCX FREEPORT-MCMORAN INC regulatory

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

• August 1, 2025, 7:59 PM ET HCC WARRIOR MET COAL, INC. regulatory

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

• June 20, 2025, 7:59 PM ET VMC Vulcan Materials CO regulatory

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

• April 22, 2025, 7:59 PM ET MTZ MASTEC INC regulatory

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

• March 21, 2025, 7:59 PM ET VMC Vulcan Materials CO regulatory

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

• March 7, 2025, 6:59 PM ET GVA GRANITE CONSTRUCTION INC regulatory

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

• February 7, 2025, 6:59 PM ET ARLP ALLIANCE RESOURCE PARTNERS LP regulatory

  ARLP subsidiary receives MSHA imminent danger order at Hamilton Mine No. 1 for methane detection; order terminated

• December 10, 2024, 6:59 PM ET CRH CRH PUBLIC LTD CO other material

  CRH subsidiary receives MSHA imminent danger order at Cape Sandy Mine #1

• October 3, 2024, 7:59 PM ET HL HECLA MINING CO/DE/ regulatory

  Hecla Mining Greens Creek mine receives imminent danger order for fall protection violation

• September 18, 2024, 7:59 PM ET MLM MARTIN MARIETTA MATERIALS INC regulatory

  Martin Marietta receives MSHA 107(a) order at North Indianapolis Quarry for unsafe work practice

• August 20, 2024, 7:59 PM ET MMM 3M CO regulatory

  3M receives MSHA imminent danger order at Arkansas quarry for fall protection violation; order terminated

• July 12, 2024, 7:59 PM ET MLM MARTIN MARIETTA MATERIALS INC regulatory

  Martin Marietta receives MSHA order at Walstrum Quarry for safety violation; corrective action taken

• May 3, 2024, 7:59 PM ET VMC Vulcan Materials CO regulatory

  Vulcan Materials' Searcy Quarry receives MSHA imminent danger order for fall protection violation

• May 3, 2024, 7:59 PM ET CLF CLEVELAND-CLIFFS INC. regulatory

  Cleveland-Cliffs subsidiary receives MSHA imminent danger order at Michigan mine; no injuries

• May 3, 2024, 7:59 PM ET MLM MARTIN MARIETTA MATERIALS INC regulatory

  Martin Marietta receives MSHA 107(a) order at Red Canyon Quarry over fall-protection violation

• April 5, 2024, 7:59 PM ET CLF CLEVELAND-CLIFFS INC. regulatory

  Cleveland-Cliffs subsidiary receives MSHA imminent danger order at Michigan mine

• March 29, 2024, 7:59 PM ET CLF CLEVELAND-CLIFFS INC. regulatory

  Cleveland-Cliffs subsidiary Northshore Mining receives MSHA order for fall protection lapse

• October 24, 2023, 7:59 PM ET VMC Vulcan Materials CO regulatory

  MSHA issued imminent danger order at Vulcan Materials' Bartlett Quarry; no injuries

• September 28, 2023, 7:59 PM ET HCC WARRIOR MET COAL, INC. regulatory

  Warrior Met Coal receives Section 107(a) imminent danger order at Mine No. 4

• June 23, 2023, 7:59 PM ET Summit Materials, LLC regulatory

  Summit Materials receives MSHA imminent danger order at Norris Quarries plant, quickly resolved

• May 26, 2023, 7:59 PM ET MLM MARTIN MARIETTA MATERIALS INC regulatory

  Martin Marietta receives MSHA section 107(a) order at Stamper Underground Mine for lack of fall protection

• May 2, 2023, 7:59 PM ET MTX MINERALS TECHNOLOGIES INC regulatory

  Minerals Technologies subsidiary receives MSHA imminent danger order at Adams Mine

• April 28, 2023, 7:59 PM ET AMR Alpha Metallurgical Resources, Inc. regulatory

  Alpha Metallurgical Resources receives MSHA imminent danger order at Jerry Fork Eagle mine

• March 31, 2023, 7:59 PM ET CODQL Coronado Global Resources Inc. regulatory

  Coronado subsidiary received MSHA order for elevated methane; vacated shortly

• March 29, 2023, 7:59 PM ET EXP EAGLE MATERIALS INC other material

  Eagle Materials JV receives MSHA order for conveyor safety issue at Texas cement plant

• February 17, 2023, 6:59 PM ET VMC Vulcan Materials CO regulatory

  Vulcan Materials receives MSHA imminent danger order at Macon Quarry after truck driver incident

• February 17, 2023, 6:59 PM ET HCC WARRIOR MET COAL, INC. regulatory

  Warrior Met Coal subsidiary receives MSHA imminent danger order at Mine No. 7

• September 23, 2022, 7:59 PM ET ARCH RESOURCES, INC. regulatory

  Arch Resources subsidiary received MSHA imminent danger order at Beckley mine; order vacated within days

• August 12, 2022, 7:59 PM ET AMR Alpha Metallurgical Resources, Inc. regulatory

  Aug 11: AMR subsidiary gets MSHA imminent danger order at Lynn Branch No. 2 Mine

• August 11, 2022, 7:59 PM ET MLM MARTIN MARIETTA MATERIALS INC regulatory

  Martin Marietta receives MSHA imminent-danger order at Texas sand mine for unsafe conveyor cleaning

• July 29, 2022, 7:59 PM ET ACA Arcosa, Inc. regulatory

  Arcosa receives MSHA section 107(a) order at Brooklyn, IN lightweight site

source · SEC Form 8-K instructions · see methodology