This mod greatly simplifies the games geology, in an attempt to make the game somewhat less intimidating to newcomers, and probably giving a bit more FPS to boot.

There is only one type of stone. (note:all stone is magma safe and acts as flux, there are no stone based aquifers)

Each metal only has one ore, ie. the only ore of iron is "iron ore", but they still occur in a geologically accurate way (correct veins/clusters in correct conditions/biomes).

Useless or uninteresting metals have been removed, the only metals are iron, pig-Iron, steel, copper, tin, bronze, silver, gold and adamantine.

Gems have also been simplified to only 3 types encapsulating the different value ranges; common gems, uncommon gems and rare gems. (names subject to change in future).

I recommend using this mod on top of Accelerated DF, as it simplifies other things in the game.

To install, just drop the files into your Dwarf Fortress/raw/objects folder and gen up a new world.