The bandits, thinking the gold dust is just worthless sand used to make the bundles of skins they were hidden in seem heavier, scatter the paydirt.
The fleet each typically consists of a sluicing apparatus, a means of paydirt collection (dredge), and a cold-water-diving life support system.
Heavier minerals, principally gold and fine-grained black sands (various iron minerals) are separated from the paydirt and reconcentrated by this means.
Conflict issues include choppy seas, poor underwater visibility, inconsistent fuel delivery, personnel issues, mining location rights, sufficient paydirt discovery, diver safety, and ocean-damaging equipment failures.