New Galacticraft distribution file
New Galacticraft distribution file

Aluminum, Tin, Copper all use similar distributions to other mods with those ores
Silicon is treated "as rare as diamond" per the mod
Silicon pipe veins reach up from bedrock with similar frequency as diamond.
The pipes are filled with sand, not lava, however.

reteo/CustomOreGen,lawremi/CustomOreGen,lawremi/CustomOreGen,reteo/CustomOreGen