Jewelers prospect ore producing their own materials.
Scribes mill producing their own materials
Enchanters disenchant producing their own materials
Tailors sew producing their own materials
Miners provide ore for Jewelers
Herbalists provide herbs for Scribes
Everyone provides weapons and armor for Enchanters
Everyone provides cloth for Tailors.
What is widely overlooked is that you don't need a profession to gather the raw materials for Enchanting and Tailoring. You do however need a profession in order to transform raw materials into something useful for those professions.