Heavy Mines are roughly three times as powerful as medium ones, with 330 AoE. Use them to blunt massed unit pushes, especially through tight chokepoints. They are best used vs. units typically fielded in close formation and high numbers, like plasma bots or medium tanks. A single one of these can wipe out an entire group in one shot. For single units and fast raiders, light or medium mines are better.

Try using Dragon's Teeth to create tight gaps with these mines in the middle.

Heavy mines tend to chain explode other mines and inflict friendly fire, and cost 6 E/sec to remain cloaked. Use them sparingly.