I mined about 10 in the first 30 mins of being there. lots of ore deposits lying around on the ash side of the island.
A big deposit is in the abandoned shack (it has a marker) just south of fort frostmoth, another smallish deposit is near the abandoned shack (it has a marker too) with
, but I can't give you a direction: it has a tent, a cart and a gold deposit too, so if you look hard enough you'll see it.