Have you an approximate death date for Ercoli Vivaldo died and county?
The only PA mining accident record I was able to find was for Eugene Vivaldi, died 1947, age 36 & survived by a widow and 3 children. I have a little more information about this accident if interested.
From Jerry,
http://miningaccidents.weebly.com/ “Mining Accidents United States, Canada, Australia & New Zealand”