Whisk together the egg, buttermilk, and molasses in a bowl until evenly blended; set aside. Stir together the whole wheat flour, all-purpose flour, bran, cream of tartar, and baking soda in a separate large bowl, and make a well in the center. Pour the buttermilk mixture into the well, and stir until a soft dough forms. Stir in the golden raisins, then turn the dough out onto a well floured work surface, and knead 8 to 10 times before dividing into two round balls. Place the balls on the baking sheets and use a sharp knife to cut a 1/2 inch deep X into the tops of the dough balls. Brush with melted butter.