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 Colorado Mine 5 Colorado Mine 6
 

 

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 Nayal Black Hawk Mine 12
 

 

 

Nayal Black Hawk Mine 13 Nayal Black Hawk Mine 14 Nayal Black Hawk Mine 15
 

 

Nayal Black Hawk Mine 16 Nayal Black Hawk Mine 17