All sources of infinite resources?

Each game, resources tend to be finite. Trees don't regrow, neither do gold or stone mines or animals to hunt, so the maps have certain limits to the amount of resources you can obtain during a game. But let's say it was an eternal game, and all the finite resources have already run out. What would you say are the few sources of theoretically infinite resources? I have a few in mind:

1) Relics

2) Trade

3) Market (Assuming you can buy resources through relic gold)

4) Malay Fish Traps

5) Feitoria

6) Keshik Attacks

Did I miss any?