Tailings,

there should be about 2 years of a total of about 30,000 to 35,000 gold, should pay for a decent supply of aquavite.

Tailings are interesting, in particular for many nickel and copper operations, the operators where too embarassed to give the actual losses and often report let us say 1% Ni loss in the slag when the actual amounts could have been 2 or more %. So a few companies have realised this and is mining both slag dumps and tailings.

By the way, in tailings and slag dumps around Sudbury, there a billions worth in various valuables, but of course it will cost a bit to recover it, but eventually these will be the mines of the future.