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area described above is posted with signs reading "Blasting <br />area". In addition to the signs, all access to the immediate <br />area of the shot is controlled by mine personnel prior to the <br />shot and until such time as access can be safely resumed. <br />A11 areas in which charged holes are awaiting firing will be <br />guarded, barricaded, posted, or flagged against unauthorized <br />entry. <br />9. Audible Warning Signals <br />BLASTING WILL BE PRECEDED BY THREE (3) SHORT WHISTLES FROM A <br />HORN. ONE (1) LONG STEADY WHISTLE AFTER THE BLAST SHALL <br />DESIGNATE AN "ALL CLEAR" CONDITION. <br />5. Emergency Detonations <br />U <br />Safety considerations may dictate <br />than the above-noted time period. <br />as defined in regulations (30 CFR <br />Coal Mine Health and Safety Act of <br />Mine Safety and Health Acts, shall <br />under emergency conditions; <br />detonation at times other <br />The following conditions, <br />77) promulgated under the <br />1969 and 1977 Amendments, <br />be cause for detonations <br />A. Destruction of damaged or deteriorated explosives or <br />detonators in a safe manner. <br />B. Disposal of misfires and/or undetonated explosives. <br />C. Firing of charged holes as soon as practical after <br />cessation of static electricity or stray current <br />conditions when electric detonators are used. <br />D. Firing of charged holes when weather conditions indicate <br />the existence of an eminent safety hazard. <br />E. Operator safety or safety considerations for the general <br />public. <br /> <br />