Re: Elsewhere
>Which then brings the question of if its worth doing at all. I dont know the answer but could reasonably be to not bother
Depends how much of the hidden costs you count.
Worth running the process to extract the value of gold = no
Worth it to reduce the amount of heavy metal waste going into landfill = yes
Worth it considering the amount of toxic waste solvents generated by the process = someone should check
There was a big deal about "mining" slag heaps for rare-earths with some interesting solvent mixtures. But the result was a small amount of rare-earths and a mountain sized slag heap now saturated with toxic solvents that had to be disposed of somehow.