Taken from mobygames.com:

The year is 2186. Humanity has established colonies on the moon, Mars, and several of the larger asteroids. Earth's sky is dotted with space habitats, and the spaceways are always busy. As usual, there is the urgent need for energy to power this advanced civilization; one of the primary sources of that energy is quantum black holes.

In Starcross, you are a miner of black holes, scouring the asteroid belt in your one-man survey ship. Finding and harnessing a single black hole can make a person's fortune. It's a lonely business, fraught with the known and unknown hazards of space. You've equipped your ship, the M.C.S. STARCROSS, with the best gear you could afford. You've put everything into this venture, and though you've tried before, you somehow sense that this time will be different.

http://www.mobygames.com/game/dos/starcross