EE began having chest pain at 9p after climbing stairs that went away. At 11p more pain came after taking stairs to top of silo. EE came off silo and sat in control room to rest. EE was unsure what was causing the pain, but was told to go in by co workers. EE drove to ER and there was diagnosed with a heart attack. Stint was placed. EE stated that DR said EE had 99% blockage.