I'm using the IC2 Classic mod and I have a silver ore conflict in the normal world and in hell.

With worldgen moving to json formats, it can't reliably be controlled by config anymore - but you can't disable silver ore's generation via data packs. You'll need to overwrite the biome modifiers that add silver to generation in this folder: https://github.com/team-abnormals/caverns-and-chasms/tree/1.19.x/src/generated/resources/data/caverns_and_chasms/forge/biome_modifier/add_feature

thank