Greetings! I'm a very new player, and I have many (Manii) questions!
I had read some about flying critters and how two mines make life a little more defensible. However the main bottleneck here appears to be that I can only build a single storage facility of each type. Recognizing this fact I have been keeping both of them under construction basically full time, right now they are moving from L7 to L8.
Q1: How far can I get with just one gold and one stone mine?
Q2: Should I just give up, snag two more mines and build more storage? If so, which two mines would be best? The easy ones, or forego those and dig for the corners?