The Flintlock mod allows to use resources in a complete new way for Civ 3, as in standard Civ 3 a resource once when appeared, could not completely disappear out of the game again. With the Flintlock mod this now is possible and can create a kind of a special event (here the time of the migration period, triggering the Golden Age for the Vikings and the Huns). When the migration period has ended, that resource will fall out completly from the listed resources of a civ.