I am replaying my old 1990's games, and got most of them working using Dosbox. One of those games is Merit's Galactic Reunion.
I am unable to find a way to put additional mines on a planet that is not suitable for living. The single miner station does not allow for fast mineral build-up for harvesting.
Not hopeful, but I am taking a chance, hoping someone here played that game and can answer the question.