[Suggestion/Request]: Surface Ore Generation Type or Option #113

One of my favorite mods is TerraFirmaCraft which has a rather useful ore spawning system where hints of deeper ore can appear on the surface as items like ore nuggets. It would be super awesome for a generation type, or option to all generation types that could place items, or ore deposits on the surface above where deeper ore spawns have occurred. Useful for challenge maps where traveling to find specific ores is a requirement.