Dynamite could turn hard material into blasted material, which can then be mined by pick or skid, or even excavator?
The way I see dynamite is as a solution to vertical mining that is currently not fully fulfilled by machines. For instance maybe have it effect a plot square 5x5x5 of where the dynamite is placeed and turn all the 125 blocks into 500 rubble. Also I believe the cost of it needs to be equivalent in some way to the skid steer so they are locked behind the same progress walls. Maybe make it in two parts where the plunger is locked behind a progress wall same as skid steer and dynamite is a crafted consumable by another skill.
I wish Skid steer and Excavator thing required new skill "Advanced Miner" or else digging ore & rock will drain huge amount of fuel.
playbabe I think the fuel consumption is able to be set on the server. On Dadspeed for instance, the skid steers use a very large amount of fuel while excavating.
Explosives were released in Update 11.1!