 In 1847, Roussillon was the defendant in the first jury trial (Isaac Graham vs. Charles Roussillon) in California.In 1848, Sainsevain and Roussillon went to the gold mines near Coloma.Sainsevain, Roussillon, Antonio Sunol, and Amador, with help from twenty-five Indians, mined gold at Don Pedro's Bar on the Tuolumne River.