Hello brothers, i've was googled so much and tested some things on the gregtech world generic file, there is a problem with ore generations, there isnt Silicon ore in the game when i playing but i want to include in to the ore generation, can you please help me? i dont know how can i do it
I look at NEI 5-7 types of silicon ores, but world dont want generating this
my mods is AE2 GT IC2 BC etc chiesel 
GregTech worldgeneric need help
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http://ftb.gamepedia.com/GregTech_5/Mining_and_Processing includes an explanation of how to modify the ore generation (it mainly involves finding the metadata for the ore you want and adding it to custom mix veins, though custom small veins are fairly easy to configure as well). I'm not sure silicon ore is really necessary for those mods, though, since you can already process glass dust in GT machines to get silicon dust.