Editing Miscellany (section)

===Coal===
Coal is a mineral trade good worth a base of 75 gold per stone of weight. This puts it at a rough equivalence to gold ore at 50% purity (see ACKS mining). It can be mined at a rate of 50 stone per week per miner tree (one master miner, two journeymen, four apprentices and ten unskilled laborers). Coal does not need to be refined. It has the following uses:

1. When used to run a smelter it increases the efficiency of the smelter by the following: small smelter x 100%, medium smelter 50% and a large smelter by 25%. In addition, it increases the yield of the smelter by 10% (to a maximum of 100%). It takes five stone of coal to run a small smelter for one week, twenty stone of coal to run a medium smelter and eighty stone of coal to run a large smelter.

2. If used by a blacksmith, armorer or similar they have their output increased by 50% per month. A smithy will go through one stone of coal a week. In addition, the smith can produce the rare alloys needed to create masterwork or magical items.

3. If used in an alchemists lab coal adds a +1 to any magical research throw that requires a reagent or consumable material. At least 1/6 stone per 250 gp of the project must be used to gain the bonus.