30 CFR 57.6902 - Excessive temperatures.
(b) When blasting sulfide ores where hot holes occur that may react with explosive material in blastholes, operators shall -
(1) Measure an appropriate number of blasthole temperatures in order to assess the specific mine conditions prior to the introduction of explosive material;
(2) Limit the time between the completion of loading and the initiation of the blast to no more than 12 hours; and
(3) Take other special precautions to address the specific conditions at the mine to prevent premature detonation.