Size actually means the amount of ore that can be mined overall, whereas the scope of mining operation is controlled by the amount of equipment and workers. So, you can buy as large a mine as you wish, you'll just be exploiting it longer if you work with only a fraction of workers. (IIRC) you can employ 800 workers tops at level one without a hit to efficiency.) Not sure about the exact role of number of shafts, complexity of mining and such, you should probably check the wiki for that.
State enterprise market offers of bauxite that I've seen have definitely not been worth the money, mostly mines with only 10-15,000 ore left for astronomical prices. In comparison, the cheapest mine (5 points) gives 20+ million. |