"Recycle Mining" I can almost picture a 100 or so years from now, geologists will be sampling the heavily used skeet and trap range locations for lead deposits. There should be a fairly significant concentrated lead deposit at these locations.
The bottom line is, if there is enough demand for a material someone is going to find a way to get it.
Recycle mining is a thing too! When I was in college I interned at a major gold producer in Northern Nevada. Gold was around $1720/oz and I was a part of a project trying to increase recovery from ultra fine solids that were remaining suspending in the tailings stream, instead of being captured.
The next component to the project was going back and dredging the slimes from the tailings impoundment to recover these metals that had been missed, amounting to approximately $10 million annually at those prices for decades.
Also, Stillwater has a recycle plant in Columbus for things like catylitic converters. You can get damn near $400 off the stock exhaust of a diesel pickup.
You could say that the tweakers that sawzalled my roommate’s and many other’s cats out from underneath their vehicles when we were in college in Butte and then took them to Pacific Recycling for hundreds of dollars were also participating in a form of recycle mining.