Edit: I can make it appear if I have it selected and scroll over an area where you cannot build, i.e. Mountains, Undiscovered areas, or cliffs. Seems like a very specific glitch.
Not sure if this is only me, but the Sand Mine is not working. When selected it doesn't actually give me anything to place. I was assuming "no sprite" meant it would appear similar to the chocolate factory, but it doesn't allow me to place anything at all.
Aside from that bug, this is a very solid game. I have enjoyed getting to this point and I hope it soon can be fixed so I can further advance.
 "City Idle"){kind=icon}