| Resource Overview | History |
Coal is one of the 31 rare resources. It only becomes visible once a nation has entered the 
Industrial Age; until then it appears as a rocky patch, as with 
Oil. It appears as a fissure with lumps of dark coal in and around it.
Like with all rare resources on land, Coal can be gathered by sending a Merchant from the Market to the resource location. Coal provide the following benefits:
- +15
Metal gather rate - +15 Knowledge gather rate
- Reduces all Timber costs by 15%
The gather rate of rare resources can be increased in various ways, as described in the main article.
The cost reduction affects all unit, building and technology cost, making Coal's bonus a quite powerful one. Amongst other things, it helps reducing cost for 
Commerce research and the future tech Artificial Intelligence.
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