Yeah I know, but a Copper node (Or it's called stone "Copper") It should give you copper ore, which you can use to smelt with sap to create copper ingot, and then turn that into cannons.
However, the node only gives you the base metal from ARK, so it cannot be used for alloy making and just for tools and armour and metal usage.
Also they aren't all "Copper nodes", Seen Iron nodes on the official and that gave you iron ore, and from what I see there should be other types, Iridum, Tin, etc.