A huge huge arsenic bubble is right underneath the main smelter site. Can't smell, taste that chemical.
Slag releases its toxins gradually until after 100 years about all is released. If you do not believe, put a piece in a zip lock bag and look at bag after a week- most pieces will off-gas and puff up the bag! We use it as lawn gravel. 😟
Channel ends at asarco site, which keeps its old (but renewed) water permit to discharge water to state route (paisano). They do their best, but some day we may be paying huge storm water fees to remove asarco's toxic waste from water we need to reuse.
See picture of the guy overseeing lining of storm water channel with toxic black slag. Slag exposed to the wind.
He wears an ARCADIS private contractor shirt.