The impractical placement of the crescent heads on top of spears doesn't make much sense apart from looks alone. Isn't an axe head placement like this on an L-shaped wooden shaft much more likely?
Salt mining:
https://i.pinimg.com/236x/0a/f0/5d/0...at-stanley.jpghttps://www.satenaw.com/wp-content/u...79-324x235.jpg
http://joelsantos.net/wp-content/upl...379_ONLINE.jpg
https://c1.staticflickr.com/1/576/22...037b9039_b.jpg