Bug with quest

[Cabbage]

guild quest. have to find a new marble deposit yet i have discovered every deposit on the island and it wont allow me to complete that section of the quest (sorry watching red dwarf and typing doesnt go hand in hand)

[Nogbad2]

Have to wait until one runs out then.

[Cabbage]

done that, it just wont fill so ive passed "finding a new marble deposit"