Mines

At the mines page, it is possible to define how many % of your mines will be busy mining a certain resource. Each race has the choice between 5 minerals (but each race has different minerals).

The sum of the percentages of all the resources should be 100, otherwise you will get an error. Negative amounts also aren't allowed.

After selecting a good amount (if you don't exactly know what each mineral does, 20% for each mineral will be right) , you mines start working in the background, and you should see minerals increasing. If you think it doesn't increase fast enough, you should build more mines.