Tin ore is a harvestable material that can be mined from tin veins (pictured above) using any type of pickaxe in Valheim. These ore veins can be found on the waters edge in black forest biomes. Once dug it will drop tin ore on the ground which will automatically go into your inventory if there is room.
Tin ore can be converted to tin ingots at a smelter using coal. Tin ingots can be combined with copper ingots to make bronze ingots which are used to upgrade to the tier 2 pickaxe, the bronze pickaxe.
Metals cannot be teleported through a portal.