None recovery of secondary metals in processing:

One of the stocks I own, they have gold/silver/copper, bit of lead and even less zinc.

To get maximum gold extraction ( about 94%) they sacrifice the silver of which they recover only about 55%. Before that they recovered over 70% of silver).

Mind you if you take the tailings to another facility that specializes in recovery then it is another matter altogether.

Just want to say where my impression came from.