In a medium bowl, mix all the ingredients for the salsa. Set aside.
Line the bottom of an oven-safe dish (or a baking sheet) with half of the corn chips.
On the corn chips, layer half of the black beans, green olives, onion slices, and banana peppers.
Using a utensil to drain the liquid, evenly distribute about half of the salsa over the nachos (to taste).
In a microwave-safe bowl, melt the beer cheese fondue. Start with one minute, then stir. Add 30 seconds, then stir. Repeat until smooth and homogeneous.
Pour half of the beer cheese fondue over the nachos.
Cover the cheese with the remaining corn chips.
On the corn chips, layer the remaining black beans, green olives, onion slices, and banana peppers.
Using a utensil to drain the liquid, distribute the remaining salsa (to taste).
Pour the remaining beer cheese fondue over the nachos.
Bake for 7-10 minutes at 350°F, then add 3-5 minutes on broil.