Though the crushing and milling were important stages in the mine’s operations, they were less critical than the secondary complex up the hill. Pablo eyed the lights of several buildings in the distance, where the milled ore was leached and separated into a handful of mineral components. Spotting no moving vehicles in the area, he and Juan took off at a quick clip.

The men had to skirt the eastern edge of the open pit, jumping into a culvert when a dump truck rumbled by. A short time later, Eduardo alerted them that a security guard was making the rounds in a pickup truck. They ducked behind a mound of tailings, then lay frozen for nearly twenty minutes until the truck returned to the front gate.

They moved toward the two largest buildings in the upper complex, then veered right and approached a small shack that fronted a towering propane tank. Juan took the wire cutters and snipped an opening in the surrounding chain-link fence. Pablo slipped through, circled the big tank, and knelt before its fill valve. Removing a small plastic explosives charge from his backpack, he attached a detonator cap and placed it beneath the valve. He set the digital timer for twenty minutes, activated it, and scurried back through the fence.

On the ground a few feet away, Pablo scattered the guard’s shoes, gun, and holster. The wallet came next, still containing its cash, then the rumpled pack of cigarettes. It was a long shot, but a superficial investigation might finger the guard for accidentally igniting a leaky tank—then being vaporized by the blast.

The two men scurried toward the next building, a large metal structure containing dozens of mechanized vats filled with leaching solutions. A small group of graveyard shift laborers monitored the vats.

The two intruders made no attempt to enter the building; instead they targeted a large pen storing chemical agents alongside one wall. In less than a minute Pablo attached a second timed charge to a pallet of drums labeled SULFURIC ACID, then escaped into the darkness.

They made their way to a second extraction building a hundred yards away, taking their time as the timers counted down. At the rear of the building, Pablo found the valve for a main water line. Monitoring his watch until just before the detonations, he twisted the valve, shutting off water to the building.

A few seconds later, the propane tank ignited with a boom that reverberated off the nearby hills. Night turned into day as a fiery blue glow enveloped the landscape. The top portion of the tank blew off like an Atlas rocket, screaming into the sky before crashing into the nearby open-pit mine in a ball of flame. Burning shrapnel flew in all directions, peppering buildings, cars, and equipment within a hundred yards of the tank.