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M-F 7:30am - 6pm ESTWarn mine workers of possible hazards and encourage safe practices on the job with a clear mine sign or blast sign. Help prevent dangerous and costly accidents with a variety of mine safety signs that get the message across. Our durable mine warning signs come in large letter formats and also with OSHA-compliant headers, such as Danger Blasting Cone, Do Not Enter Blasting Cone, Snap Loop - No Smoking, and Heavy Duty - Danger Confined Space mining signs.