Tin is a commonly used in a lot of recipes across several mods. It is found in the environment as an ore which can be smelted into ingots or macerated into Tin Dust. It can be found at layer 40 or lower.
Tin is a critical item in and other mods.
Used in Industrial Craft, Buildcraft, and Redpower. Used in multiple recipes including BT Battery and Batbox. An essential material for many recipes. Tin can be found at around layer 35 and lower. Like Copper, there is more then one type of Tin. But all the different types of Tin can all be crafted to make the same thing. For instance, Redpower Tin can be used to make IC2 recipes and vice-versa.