{"data":{"id":"us/30-cfr-57.4101","jurisdiction":"us","citation":"30 CFR 57.4101","heading":"Warning signs.","body":"Readily visible signs prohibiting smoking and open flames shall be posted where a fire or explosion hazard exists.","path":["Title 30—Mineral Resources","CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR","SUBCHAPTER K—METAL AND NONMETAL MINE SAFETY AND HEALTH","PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES","Subpart C—Fire Prevention and Control"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-30.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:24Z","sha256":"75029d47264ab86f033d2b20a897f46b89638d631abbef3a84347f234938bda5","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-57.4100","next":"us/30-cfr-57.4102"},"notice":"GroundRules: Original legal text. Not legal advice."}