I once found rules on developing resources such as Iron and fur for an additional way to make an income, I was curious if anyone knows where those rules are hiding and can point me to them.

I recall a Domain Action called something like find/develop Resource, which allowed you to either search your province for a resource or develop one that you had already discovered there. Different resources had different benefits, though they all made a profit for you when developed.

Any help would be wonderful. Thanks