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Miner was operating an excavator (Cat 385) when they experienced a seizure. Coworker in a truck (Cat 745C) arrived to load and notice the excavator boom extended instead of in loading position and saw the operator in the cab leaning against the window. Coworker found the excavator operator to be unconscious and turned off the excavator. Coworker called supervisor and 911.

Employee complained of nausea and asked to go home. Other employees recognized symptoms consistent with a heart attack, and called 911. It was later determined that the employee did suffer a heart attack.