A 7-block tin ore vein in a cavern
To mine Tin Ore, a Stone Pickaxe or better is required.
Tin Ore can be smelted into Tin, or more efficiently, can be placed into a Macerator to create Tin Dust.
It is found between layers 0 and 40, and usually in groups of up to 6 blocks.
This mod is: Thermal Expansion