An acquaintance once landed a contract to clear up a gold mine site after shut down. He bid super low for it, the only condition he stipulated was it be left in the condition in which he had inspected it, something like that.
The operator immediately gave him the contract, and he immediately gathered up all the dust from conveyor belts etc sifted through it, separated all the left over gold inside and sold it.
Set him up in a big way, the idiot operator tried to take him to court to claim the gold as theirs, with no success.
So yeah, sometimes there truly is gold in that there dust.
I will call them sansculotte.