Spin State - Chris Moriarty [129]
That was the first link in the chain: four hundred miners underground with a lift that carried only eight men per trip instead of the chippy lift’s forty-eight.
The first shift foreman then made a decision that, only a week ago, would have been the right one. He consulted the airflow maps and rerouted Pit 4 evac through Pit 5’s main shaft, two and a quarter miles southeast of the Pit 4 headframe. What he didn’t know—couldn’t know—was that the maps he was looking at were four days out of date because of a glitch in the AMC data system. And two days ago, a work crew had closed off the 642 crosscut to Pit 5 in an attempt to fix the ventilation problems that had contributed to the last fire.
Haas knew about the closures, of course. He would have known the maps were out of date, would have been able to put the pieces together and turn things around if he’d been there. But Haas was at a Mine Safety Commission hearing in Helena. And with Haas gone, no single person on-site was in a position to see what was coming.
And that was the second link in the chain: an entire shift sent downshaft with evac instructions that dead-ended thirty-two hundred meters underground in front of two locked-down steel ventilation louvers.
Meanwhile, Pit 4’s double drum lift was still being used to haul miners—and all the coal, waste rock, and condensates those miners were hacking out of the ground had to go somewhere. The miners began routing their carts through the 531 crosscut to Pit 3’s still-operable double drum lift. Coal and waste carts began piling up in Pit 3’s central gangway, directly under the main air intake, whose Vulcan fan pumped forty-two hundred cubic meters of air per minute through the entire active workings of Pits 3 and 4.
That underground traffic jam was the third link in the chain. That, and a simple physical fact: coal is a rock that burns.
At 3 A.M. a flash fire flickered through the 4100 level of the Trinidad, almost six kilometers from the Pit 3 headframe as the crow flies. The fire crew suited up and went down, but they couldn’t find a point of origin—and though they shut down the nearby brattices, air was still coming in from somewhere. They called up to the Pit 3 fanhouse to report the fire. The fan operator checked his maps, saw that the fire was on Pit 3’s main ventilation circuit, logged the time, and flipped the safety shutoff on his fan, cutting all forced-air ventilation to Pits 3 and 4.
On any other day, the shutoff would have been the right thing to do. It would have given the fire crew additional time to find the flash fire’s source, and it would have stopped the big fans from pumping suffocating smoke through the rest of the mine until they got the crystals under control.
But today wasn’t any other day. Today there was a freight-train-sized traffic jam of coal and refuse carts lined up down the length of the 3100 gangway just below the intake shaft.
As long as the fans were running, the fresh air flowed through the gangway fast enough to catch the highly flammable coal dust rising off the carts and blow it out the Pit 4 outtake before it could stagnate and become volatile. When the fans shut off, however, the dust began to thicken in the unventilated gangway and climb toward ignition temperature. All that was missing now was a spark. A spark, and fresh air to feed the fire the spark would start.
At 3:42 A.M. by the clock in the Pit 3 fanhouse, the fire crew called up top to report that the fire in the Trinidad was out.
At 3:47 the above-ground foreman ordered the fans back on.
At 3:49 the Anaconda crossed the line that every mine crosses sooner or later: the line where only the dead know what really happened.
All the living knew was that at ten to four a shock wave rippled through the coalfield, breaking windows and knocking people off their feet in the streets of Shantytown. People ran out of bars and flophouses, still half-asleep,