batbox and macerator. always. then, if you really want that extra resource, make some pulverizers with MJ power. factorization's grinder is absurdly profitable but quite expensive.
^^ Good idea, but here's one more fixed on easiness.
Create 3 Hobbyist's Steam Engines, ~16 gold conductive pipes, 3 wooden conductive pipes, a Powered Furnace and a Pulverizer, ~8 stone waterproof pipes OR cobblestone waterproof pipes, an Aqueous Accumulator and ~stack of coal. +Optionally a chest
Place down your 3 wooden conductive pipes, then place the hobbyist's steam engines next to them. Then attach gold pipes to the end of each wooden one, and lead it over to the area you want your machines. Place your pulverizer, and then (for newbies) place the powered furnace to the right of it, if you want, you can also place a chest to the right of the powered furnace. Now, create a 3x3 hole in the ground behind your engines, and place a water bucket in each corner. Then above the middle block, place the acqeous accumulator and use the waterproof pipes to to hook it into your engines. Then place coal in your engines, give them a redstone signal, and put ores into the pulverizer. They'll be ground into dusts and then cooked into ingots in the powered furnace and if you put down a chest, deposited into it.