From the CDPHE's ablation webpage:
On December 1, 2016, The Department issued a determination that the proposed ablation operations at the Sunday Mine by Black Range Minerals must be regulated by the Department through a milling license pursuant to Part 18 of the Regulations.
https://www.colorado.gov/pacific/si...rad-ablation-Black-Range-Cover-Ltr-120116.pdf
https://www.colorado.gov/pacific/si...-Black-Range-Decision-Analysis-Fnl-120116.pdf
https://www.colorado.gov/pacific/si...lation-AMT-Response-Comments-Final-120116.pdf