Search for a "Primordial Relic" that's at the bottom of an abandoned ore mine. The mine is infested with giant ants, who have a leader - a mutant titan who doesn't like visitors. Good luck.
Explore the Mine in Your Minecart
Use a motorized minecart to travel through the mine. Going fast makes a lot of noise and you run the risk of making a wrong turn...
Outsmart or Abuse the Ants
Ants will use various paths within caves to access and mine the gems. Figure out a way to stop them so you can mine the gems yourself.. or use dynamite.
Upgrade the Minecart
Use the gems to fuel the minecart booster or visit the Merchant to buy items and upgrades
Defeat Antodon in the Ultimate Minecart Chase
You'll need the upgrades because Antodon has his own minecart powered by pure ancient evil and he will not stop until you are derailed.