|MadSci Network: Earth Sciences|
Mint Leaves may repel some kinds of ants and not others. Excellent experiment to try. You can start by getting some ants from your house, probably Argentine ants [imported to the U.S. years ago and a real pest now] and then getting other ants from the yard [best to ask a local entomologist to help you]. You can put mint leaves in with them in a jar separately [many ants fight when placed together] and see if they avoid the leaves or not. Because of your age, this is the best place to start your experiments. If you run into problems, let me know and I will help you.
Try the links in the MadSci Library for more information on Earth Sciences.