https://www.bbc.com/news/world-us-canada-54608836
The festive O in the sign hides the dirty truth.
Remediation is seen as a drain on local economies. A failure to mark the leftovers as lethal means the piles will be disturbed for years to come as companies mine sift through the tailing piles for other other minerals.
One bright spot is that the process to extract magnesium destroys the asbestos fibers. No mention of how fibers will not become airborne while the tailing piles are dug up with large equipment.