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DOL/MSHA

RIN: 1219-AB36

Publication ID: 2012

Title: Respirable Crystalline Silica
Abstract: Current standards limit exposures to quartz (crystalline silica) in respirable dust. The metal and nonmetal mining industry standard is based on the 1973 American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Values formula: 10 mg/m3 divided by the percentage of quartz plus 2. Overexposure to crystalline silica can result in some miners developing silicosis, an irreversible but preventable lung disease, which ultimately may be fatal. The formula is designed to limit exposures to 0.1 mg/m3 (100 ug) of silica. NIOSH recommends a 50 ug/m3 exposure limit for respirable crystalline silica. MSHA will publish a proposed rule to address miners' exposure to respirable crystalline silica.
Agency: Department of Labor(DOL)	Priority: Other Significant
RIN Status: Previously published in the Unified Agenda	Agenda Stage of Rulemaking: Proposed Rule Stage
Major: No	Unfunded Mandates: No
CFR Citation: 30 CFR 58
Legal Authority: 30 USC 811

Legal Deadline: None

Timetable:

Action	Date	FR Cite
NPRM	08/00/2013

Regulatory Flexibility Analysis Required: Undetermined	Government Levels Affected: Local, State
Small Entities Affected: Businesses, Governmental Jurisdictions	Federalism: No
Included in the Regulatory Plan: No
RIN Information URL: www.msha.gov/regsinfo.htm	Public Comment URL: www.regulations.gov
RIN Data Printed in the FR: No
Agency Contact: George F. Triebsch Director, Office of Standards, Regulations, and Variances Department of Labor Mine Safety and Health Administration 1100 Wilson Boulevard, Room 2350, Arlington, VA 22209 Phone:202 693-9440 Fax:202 693-9441 Email: triebsch.george@dol.gov