When Jake is crawling through the ore chute and Sisko and O'Brien are talking with him, when they tap their communicators the activation sound is consistent with Bajoran communicators, not Starfleet.
After Kira tells Sisko the core is going to blow in 2 and a half minutes he wastes time arguing with Jake, then He, O'Brian and Jake just leave casually walking out. Maybe Bajoran minutes are longer than Earth minutes.
After Siska blows the door with the power cable and the iridium, he goes to the door where there are still piles of iridium lying on the floor and drops the power cable on them.