Board Thread:General Discussion/@comment-24444567-20140304185159/@comment-24301156-20140331160212

Another reason for mining is that a second dragon can be traded for quite nice gems. Not as important now that there's a new dragon, but if you can mine enough to get two of them it can still be useful.

Also noteworthy: When you have only one one land part left to build (nr 10, I think?), DON'T build it. Keep piling up heaps of land pieces that you don't use, because once you've built the last piece, the mine will be closed and you will not be able to dig any more (so no more bonus food from there).