This mod takes the idea of the dirty ores ( https://www.factorio.com/blog/post/fff-129 ) and introduces them into the game.
When a ore deposit is depleted it is replaced by a dirty ore variant. When a dirty ore deposit is depleated it is replaced by a trace ore variant with infintie yield.
Dirty and trace ores need to be processed before smelting into plates.
Version 0.6.0 should properly support liquid resources as well.
The ores are dynamically created on load up this has advantages and disadvantages.
(+) it should generate dirty ore variants of all mods that load before mine
(+) we're getting such hilariously sensible things like trace stone deposits that need to be refined into stone and have as a byproduct stone
The mod also introduces higher tiers of chemical plants and oil refineries, two new assembling machines and buildings for the processing of dirty ores.
Features can be toggled in the config file.