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• 7.3 When a misfired hole has been detected, no one shall return to the misfire for at least 15 <br />minutes. <br />7.4 If explosives are suspected of burning in a hole, no one shall return to the hole within one (1) <br />hour. <br />7.5 M audible all-clear signal will be given after the blast and an inspection of the blasting area <br />has been made. The all-clear signal shall consist of one prolonged signal following an inspection <br />of the blast area. The warning and all-clear signals will be audible within range of one-half mile <br />Crom the point of the blast. <br />C <br /> <br />