二氧化硅规则修正案推迟，等待司法审查

US – April 2026 The Mine Safety and Health Administration(MSHA) has delayed its standard on respirable Contacts Keith BradleyPartner, DenverE keith.bradley@squirepb.comT +1 303 894 6156 On April 18, 2024, MSHA published its final rule, LoweringMiners’ Exposure to Respirable Crystalline Silica andImproving Respiratory Protection, 89 Fed. Reg. 28218 (2024 Peter GouldPartner, DenverE peter.gould@squirepb.comT +1 303 894 6176 The 2024 Silica Rule established a standard for lowering thepermissible exposure limit for respirable crystalline silica atmining operations. The rule also amended existing safetyand health regulations for metal and nonmetal mines to alignwith the new exposure limit. MSHA originally scheduled the Lianne Mantione Partner, ClevelandE lianne.mantione@squirepb.comT +1 216 479 8471 Kayla Mendez Following publication, industry groups challenged the 2024Silica Rule. The court ordered MSHA to stay the compliance Associate, DenverE kayla.mendez@squirepb.comT +1 303 894 6124 On April 6, 2026, MSHA published a notification delaying thecompliance deadlines provided by the amendments to theexisting standards for metal and nonmetal mines in 30 C.F.R.§§ 56–57. While MSHA describes the compliance deadline Essentially, MSHA used the notice as a mere formality to(1) acknowledge that the court paused certain compliancerequirements in the 2024 Silica Rule until resolution of the The impacted conforming amendments regarding exposurelimits and control for airborne contaminants include 30 C.F.R. The existing standards set forth in 30 C.F.R. §§ 56.5001,56.5005, 57.5001 and 57.5005 remain in effect until the court