Make the salsa: combine all of the salsa ingredients in a bowl. Stir well to thoroughly mix the flavors. Set the bowl aside as you grill the salmon.
Grill the salmon: Rinse and pat dry the salmon fillet, then spread the olive oil over the flesh side and sprinkle a bit of salt to taste.
Place the salmon on the grill, skin side down. Grill covered for about 4 minutes, then gently turn the salmon to the flesh side. If the skin sticks to the grill, just place the fish on a clean portion of the grill.
Grill the salmon flesh side down for another 2 to 3 minutes, with the grill covered.
Remove the salmon from the grill. Let it briefly rest, then portion the salmon. Plate the salmon servings with a couple of scoops of mango salsa. Pass extra salsa at the table and enjoy!