Translations:GregTech 5/Mining and Processing/274/en

Probably the most important line in this chart initially is the Cassiterite Mix Vein. Cassiterite is a form of Tin Ore, and Tin is necessary to make Bronze for Steam machines. However, Cassiterite's generation range is between Y=40 and Y=120, slightly below the surface to above the tops of some Extreme Hills. This, combined with the fact that Tin assumes a color almost identical to that of regular Stone, means that a good Tin vein may be rather difficult to find in the early game. Don't give up though, just remember to look high.