Your post came up from a google search of the words Bracebridge and Gravere.
Your grandfatherwould have been part of a very large group of men that went from the adjacent villages of Meana and Gravere in Italy to the neighbouringtowns of Bracebridge and Huntsville in Ontario over the period 1903 to 1914. There, they worked for the Anglo Canadian Leather Company.
In his book Italians in Toronto: Development of a National Identity, John Zucchi gave this explanation as to why people left the region: "A peasant in Meana or Gravere near Susa in 1910 realized sooner or later that working in a tannery in Acton or Bracebridge, Ontario or as a chef or waiter in Toronto was more remunerative than collecting chestnuts or fruit for export to France."
Many of those that went to the tannery later left for other places, such as the Detroit area (auto industry), Toronto and the Niagara Peninsula.
Many of those that immigrated from Gravere and Meana went to the coal mines of west PA.There is a good chance that your grandfather was joining friends or family from Gravere when he went there.
Other destinations for these immigrants included Toronto, Mellen Wisconsin, the Seattle area of Washington state, San Francisco and New York.
I have a database of about 400 immigrants that came from Meana di Susa that I would be quite happy to send you. It may not give you genealogical information as your family was from Gravere, but given that people from Meana and Gravere tended to travel to the same places, it may give you some historical context.
Emile Franco Ottawa Canada
email addresses efranco at canada dot ca emilef at sympatico dot ca