Ball mills come in all sizes, some use rods instead of balls to grind the ore, e-scrap is treated as you would ore.
My mill is about 18 inches in diameter by 30 inches long and only has 6 balls, the trick is having a lifter bar welded to the inside of the drum to lift the balls to top dead center before falling onto the chips.
Here's 4 large mills located at one of the sites I visited to have a look an a crane.
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