Key takeaway
What This Development Means
MSHA's respirable crystalline silica proposal completed OIRA review on 10 August 2026, but no proposal or new compliance date has been published. Mine operators should maintain current protections and prepare to compare any future proposal with the stayed 2024 rule.
Did OIRA Clearance Make New MSHA Silica Requirements Effective?
No. OIRA completed review of a draft proposal. No proposed rule had been published by 13 August 2026, and a proposal would still require public consultation and further rulemaking before creating final amended duties.
Are The 2024 MSHA Silica Compliance Deadlines Currently Enforceable?
The Eighth Circuit stayed the 14 April 2025 coal deadline and 8 April 2026 metal and non-metal deadline, and MSHA paused enforcement. Operators should still maintain applicable protections and monitor the court case and any new rulemaking.
Source basis: US Office of Information and Regulatory Affairs, RIN 1219-AC22 Unified Agenda record (review concluded 10 August 2026)
The Mine Safety and Health Administration respirable crystalline silica proposal completed review at the Office of Information and Regulatory Affairs on 10 August 2026 with the outcome “consistent with change”. No proposed text had appeared in the Federal Register by 13 August, so the milestone signals possible publication but does not impose a new exposure limit, monitoring duty or deadline on US mines.
What The MSHA Respirable Crystalline Silica Review Means
The action is listed as RIN 1219-AC22 and remains at the proposed-rule stage. The Office of Information and Regulatory Affairs received the submission on 4 May 2026 and concluded its review on 10 August. “Consistent with change” means the reviewed draft may have been modified during review; it does not reveal the final wording.
The Unified Agenda says MSHA is considering amendments to the 2024 rule in 30 CFR Parts 56, 57, 60 and 72. Subjects include exposure monitoring, methods of compliance, respiratory protection and medical surveillance, without reducing miners' protections. Those descriptions are planning information, not operative requirements.
How The 2024 Silica Rule Stands Now
MSHA's 2024 final rule became effective on 17 June 2024. Its original compliance dates were 14 April 2025 for coal mines and 8 April 2026 for metal and non-metal mines.
On 11 April 2025, the US Court of Appeals for the Eighth Circuit stayed those compliance deadlines while it conducts substantive review. MSHA consequently paused enforcement of the new rule's compliance obligations. Its April 2026 bulletin confirms that pre-2024 coal and metal or non-metal standards remain enforced. The stay does not create a general exemption from mine-safety law or remove the need to manage silica under applicable standards and safe-work programmes.
No 2026 notice of proposed rulemaking for RIN 1219-AC22 was found in the Federal Register by the verification date. Businesses therefore should not present possible amendments as settled policy or calculate a comment deadline yet.
Analysis: The pre-publication milestone gives operators time to preserve a defensible baseline of sampling, engineering-control, respirator and medical-programme data. That evidence will make it easier to identify operational and capital impacts quickly once the actual proposal can be compared with the stayed rule.
What Mine Operators And Suppliers Should Do Now
Keep existing dust controls, worker protection and recordkeeping in place. Catalogue where current programmes rely on provisions of the 2024 rule that are under stay, and identify the operational owners who will review any future proposal.
Laboratories, ventilation specialists, equipment manufacturers and medical providers should avoid marketing assumptions about the unpublished text. They can instead prepare an evidence-based comparison covering monitoring frequency, control hierarchy, respiratory protection and surveillance capacity, including any effects on occupational exposure limits.
What Happens Next
MSHA may publish a notice of proposed rulemaking after OIRA clearance. Only that publication will disclose the proposed amendments and any public-comment deadline. The court case may also affect the 2024 rule, so stakeholders should monitor both the Federal Register and the Eighth Circuit proceedings.
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