I've got a problem with this modpack. I added Underground Biomes, removed Project Zulu and Roguelike Dungeons, created the world with Biomes 'O Plenty setup. So, looking through kinda 20 chunks I didn't find any Tin/Cassiterite veins. Can it be a problem with installed Underground Biomes or turned on Biomes 'O Plenty, or it is a problem with GregTech 5.08.12?
UPD1: Also found out, that I deleted 3D Furnace and IHL Tools and added Bacpacks mod
UPD2: And I've been lookin not througn 20 chunks, but in 100-120 chunks in 4 different world at all heights