I still don't think that mining is going to rival faming. One reason is because the patience involved in mining is amazing. You have to stay at your rovcks and smash them and risk someone else taking them. Then you go back and start crafting them and finally make them into cash.
With farming, you spend a good 50 min (if your smart you can hold up to 4 trees)
and then you can make pies at your own leisure. So in about 1 hours time, you can make about 100 g with farming and 70 g with mining