The Colorado was originally mined for Lead, Silver, and Fluorine.  There I found pieces of Fluorite infused with surprisingly strong green Willemite, also phosphorescent. 

 

Colorado Mine 1 Colorado Mine 2 Colorado Mine 3
 

Colorado Mine 4
 

 

Nayal Black Hawk is a group of mines that encompasses an area of several small hills.  It was originally mined for Fluorine, Lead, and Silver.  Fluorite is indeed plentiful here and on the hillside I found some pieces just sitting on the surface, apparently not from any mining activity.  There were a wide variety of fluorescent minerals there including Hydrozincite, Calcite, Fluorite, Willemite, Hyalite, and Caliche.

 

Nayal Black Hawk Mine 1 Nayal Black Hawk Mine 2 Nayal Black Hawk Mine 3
 

 

 

Nayal Black Hawk Mine 4 Nayal Black Hawk Mine 5 Nayal Black Hawk Mine 6
 

 

 

Nayal Black Hawk Mine 7 Nayal Black Hawk Mine 8 Nayal Black Hawk Mine 9
 

 

Nayal Black Hawk Mine 10 Nayal Black Hawk Mine 11