Mekanism

Mekanism is a Tech Mod which specialises in Energy production and Ore Processing (upto 5 ingots from 1 Ore)

Early Game power generation leaves much to be desired and possibly the only thing unique in early game are the "Paxels" which are a Multitool for Mining shoveling add treefelling, however mid-late game powergen with the insane ore processing make this mod a top contender as a tech and armour mod adding the strongest "standard" metal armour, adding a few useful side tools such as Fixed Point Teleportation, Quantum Power Transfer (essentially teleportation for energy) Deep sea Diving gear, Night vision and the Atomic Disassembler,

A major difference with Mekanisms early game is that it's primary Ore is obtainable from the get go (alright not quite) being obtainable with a Wooden Pick, Osmium has a mining level similar to that of Iron and steel with a durabilty somewhere in the middle, with how common Osmium is, you can be free to use Osmium for your day to day and still have plenty left over for the machines and armour infusions allowing you to save your iron for the important things..

Ore Processing
As above, Ore Processing has a maximum capability of 5 Ingots per ore and every tier inbetween, the higher your teir the more convoluted the process as shown in this stolen flow diagram

the only waste resources from the 4x+ Teir (shown as Teir 3) is Sodium which currently serves no purpose