Either wait until you have researched stellar manipulation to level 4 or 5 and open a new warp point to the enemy system from one of your own...
Or use
http://forum.shrapnelgames.com/ubbup.../HD-Mod1_0.zip
The instructions are on the mods board, HreDaak posted it on 19th of jan.
Which uses Point defense cannon to sweep mines instead of minesweeper comps. It makes the AI a lot harder to deal with and mines become a LOT less useful.
[This message has been edited by jimbob55 (edited 31 January 2001).]