Back when I lived in the Rust Belt, I'd see groundhogs on the shoulder of the road in the spring with their nose in the dirt. My guess they were licking remnants of road salt.
That's exactly what they're doing.
Salt seems to be everywhere , why not in the ashes.
Have witnessed animals come from a ways off just to get some salt.
Ever seen a well head , with deer tracks everywhere around it in the mud caused by releasing pressure on the pump?
Weather induced salt water, or just salt from deep in the earth, it's released at the pump.
Modern day salt licks.
Sodium , isn't destroyed , it just goes with the flow.