there is already a life skill for collecting clay. its "collection" skill.

(bring 5 barley to the farmer at the farm in north island.)
collecting skill is for water, clay, crude oil, quarts, alumminum and any of those rocky looking pits. aswell as the bushes for grass and vines and etc.

(bring 3 iron ores to the miner in maka cave... or kama, the one with the worms next to the lake on north island)
mining skill is for minirals rocks, like rubies and and black jades.

(bring bei mineral. second floor of the worm cave to the woodcutter in holy next to the shop and the vacume guy)
and cutting skill is for tree stumps