Metoraj Family Line

My Grandfather, John Joe Metoraj migrated to the USA when he was a young teenage with his sister and settled in Chicago, Illinois(west side downtown Polish district). But the family came down the border mountains via Russian Calvaryman and settled in South Poland (Krakow District) and started a Coal Mine after the war about 1891. My grandfather was born at that Coal Mine...My question remains. Is there anyone out there who is familar with this situation and can they help me find my family linege??