Mines: How do they work?

[stoicFaux]

Mines: how do they work? In the simulator they clump up in terribly large Groups, unless you drop then in small amounts each turn. :P

If I mine a warp point, what happens when someone hits it? (How is the combat handled, do the mines still clump, etc.)

Haven't had anyone run into my mines so I haven't determined the above experimentally.

Thanks for any info/advice.