Preheat oven to 350°. Grease an 8 ½ by 4 ½ inch loaf pan and line with a strip of parchment and dust with flour.
Peel and chop the mangoes into small pieces. Puree enough mango to make ½ cup, then set the rest of the chopped pieces aside.
In a large mixing bowl, whisk together the flour, sugar, baking soda, salt, cinnamon and nutmeg.
Make a well in the center of the dry ingredients and add oil, eggs, yolk, mango purée, and vanilla. Stir well, then fold in mango, nuts, and coconut.
Pour batter into prepared pan and bake for an hour or until a skewer comes out clean.