Segura V. Kaiser Steel Corp‪.‬

On April 23, 1979, Cipriano Segura (Segura), a miner employed by Kaiser Steel Corporation (Kaiser) as a "utility man,"*fn1 suffered a heart attack while performing his duties. Segura's job on that day consisted of unloading trucks filled with coal. He directed the truck drivers to stop in appropriate locations and signaled them to open the trucks' belly doors to release their loads into "dumps."*fn2 The web or "grizzly" covering the hole into which the loads are released sifts the chunks of coal so that the coal may pass evenly below, onto a conveyor belt. The coal chunks were unusually large on April 23, so Segura had to quickly break them with a fourteen-foot steel bar and a twenty-pound sledgehammer to allow their free passage through the grizzly. Several trucks were in line, waiting to be unloaded. Segura had trouble breaking one particularly large chunk of coal. One of Segura's supervisors strapped a rope to Segura and lowered him into the hole so that he might attach a chain around the chunk and allow a loader to pull the chunk from the mouth of the grizzly.