I've noticed some things in http://ftb.gamepedia.com/GregTech_5/Mining_and_Processing that seem inaccurate, and I wanted to check before editing the page:
1. About the purpose of small ores: "GregTech Iron Ore(s) cannot be mined with a Stone pickaxe, you need Iron or Bronze to mine them."
That's true for iron, banded iron, and yellow limonite ore, but pyrite and brown limonite ore can be mined with a stone or flint pickaxe. I'm curious: are any small ores really critical, or would it be possible to play with small ores disabled in the config?
2. "If Custom Ore Generation or Per Fabrica Ad Astra: Geologica are installed, GregTech will disable its own ore generation and use COG or PFAA generation."
I've searched the GitHub source, and I can't confirm that GregTech can detect Custom Ore Generation by itself (without PFAA).
3. "Hammer, Forge Hammer: The simpler form of the Macerator, it smashes ores but does not double them. It's fast, but it's effectively useless after you have electric machines."
The forge hammer is not all that useless in the electric machine stage until you have a universal macerator, sifter, autoclave, and implosion compressor - it uses EU instead of tool durability, is faster and cheaper than a macerator for converting crushed ore to impure dust (or purified ore to purified dust), and produces more gems from some gem ore blocks than furnacing them (though less than the sifter or autoclave/implosion compressor). I'm willing to ignore its use for making long rods, converting stone to cobble, and converting cobble to gravel for purposes of this wiki page, since those don't count as ore processing.