lay pits must be established close to a body of water. Their work force digs clay for conversion to pottery.

Iron mines can only be sunk near rock out-croppings; their workers mine iron to make into weapons.

Timber yards need to be near a stand of trees, and their output is used to make furniture.

All of these raw material facilities need a nearby source of workers, and easy road access to the appropriate workshop. They are all undesirable neighbors for housing.