In Palburough Mines at level 10, it is recomended that you stay on the first level. There are 6 known mining points to take advantage of. Be carful of the quads, will link and aggro, so you would be wise to take them out 1 by 1 up to the next mining point. The rabits also link but they dont aggro.

At level 15-16 you can venture to level 2 but watch for vetran and onyx quads. Again pick them off one at a time, and wllways check your prey. if they link your in trouble and if you take one thats tough, its a long run back from Bastok.

At level 30 you pretty much have the run of the roost. Hardly if any quads will aggro you, and inbeween mining you can kill copper/old/brass quads for Palburough keys. The keys can be used to open treasure chests in the mines.

In Palburough Mines you will find...
pebbles (2-300 gil/12)
Tin ore (50 gil)
Copper ore (50-100 gil)
Zink ore (250-300 gil)
Silver ore (300-350 gil)
Iron ore (5-600 gil)
Mithril ore (1000-1100 gil)
Platnum ore (15,000-20,000 gil)

Good luck, and happy hunting.