This page explains the job called Miner.
All that is required for mining are for the player to be Level 20 and have a Mining Pick or Custom Mining Pick in their inventory. A Mining Pick can be purchased from a Mining Tutor, whereas a Custom Mining Pick can only be purchased from a guild vendor.
Mining is a job that one can aquire at Level 20. It allows the player to mine ore from various ore deposits found around the world. Just like any other job, the higher your job level, the higher grade ore you can mine. When the player has a pickaxe in their inventory(you dont need to equip it), simply click on an ore deposit and you will begin mining. You will then receive a random amount of ore and a fixed job EXP gain, depending on the ore deposit