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Ok, I renamed the resources, and now all three spawn. Looking a bit more dwarf fortress-ish now. By placing a square of your color on top of the resource, you start receiving 2 of it per node per second.
Best of all, it works for both players at the same time, and only each player gets its own resource update, so you can't cheat and look at what econ your opponent has by sniffing the network traffic.