Always equip your best gear before heading down into the mines. You'll need everything you can carry.

Try combining various items through experiments and you might find some very useful things.

Expand the inventory as soon as you can. You will realize how mines quickly fill it up and you really need that space.

If you come across items you don't really need, you can always shatter them and gather resources.

Clans can offer various rewards, so make sure you join the one you find interesting.

When you feel you've mastered the game, take a stab at some heroic digs, which are quite dangerous, but can yield awesome rewards.

The endless mines are a daily thing so don't forget to test them out.