Jan 07, 2010 · (H) High Yield (recommended) (B) Requires Book learnt skill (workbench books are loed in most towns: Map of Myrland List of workbenches for reference. Refining will be shown with a ratio Iron + Coke + Calxpowder 2:1:1 so in this example you use 2 units of pig iron and 1 unit of each alyst in your rifining window.