I find it hard to get a working knowledge of all the different options for ore processing. Almost every industry/tech mod adds its own mechanics.
Options I've explored:
(1) (ores*2) TInker's Construct smeltery. A good early-game option with the bonus of giving you great tools on top of it which stay useful basically forever. Disadvantages: it is somewhat awkward to automate and it needs a source of lava, which I found isn't always so easy to come by unless you go into the Nether.
(2) (ores*2, later 3) Thermal Expansion Pulverizer/Redstone Furnace/Induction smelter. Works reasonably well early to mid-game, but suffers from the fact you can't speed those machines up. They remain useful for specialized use and crafting of specific components, but are phased out of the processing chain at some point.
(3) (ores*2, later 3) IC2: It's basically impossible to speed the Macerator up to tolerable levels - once you have the power to do so, you'll be better off with other options. However, the Induction Furnace is one of the fastest ways to smelt things and remains a good option even in a high-end processing chain.
(4) (ores *3, later 5) RotaryCraft: I haven't used the low-tier processing chains, but the Extractor gives you the best output per block of ore I know - including some of the byproducts you'd get from TE's Induction Smelter. It is also very easy to build and to set up, but rather tricky to power, and getting it to work fast takes a lot of power.
(5) (ores *2, later 3) Factorization: Critical Failure for being incompatible with the major power systems, and incredibly finicky to get to work in my experience as well an extremely slow (add 10x "extremely") late process. I try to forget it.
Options I haven't explored:
(1) Engineer's Toolbox Grinder/Multi-Smelter. This provides possibly the most compact way to process ores, as well as ore-tripling plus byproducts. Any system based on modular sockets is intrinsically scalable, but unfortunately, it does not appear to be possible to speed the process up except by building more machines.
(2) Mekanism: don't know anything about this except that it has the digital miner.
(3) Thaumcraft: haven't used TV for ore-processing because it appears very awkward to automate.
(4) Mariculture: offers ore-doubling, later a 4.66 multiplier when fully upgraded. Unsurprisingly you need maritime resources added by the mod for the upgrades, so that might be a playstyle alternative for those who play ocean-themed games.
I'm sure there are more option....[DOUBLEPOST=1403524853][/DOUBLEPOST]
Too true. Ore Doubling was a unheard of concept when it was first released... during alpha in Industrial Craft. Now? It took the IC2 EX branch to make a way to triple them native to IC2 and it's still pretty unusable.
That said, a sign of progress is indeed getting more from your ores both in Minecraft and real life. I hate to say it, but for realistic sounding methods, Mek has RoC beat. True, I don't give RoC enough credit for that one, but seriously, roughly the same ore to ingot output, but one is insanely complex to just reach, and the other is limited by power input, not any other resources.
How does Mekanism's ore processing work? I haven't explored it since it was in one of the modpacks I was playing, but what I have heard sounds intriguing.