Mining in General
To mine resources, a player requires either hands, picks, or melee weapons. Picks are by far the best choice to use to mine resources. Generally speaking if a weapon is capable of mining or harvesting a material, it is at 100%, or one per swing.
There are five types of pick:
Different resources will gain you varying amounts of experience. Experience is gained per resource count, so if you harvest two wood in a single swing you gain twice the base amount.