Province with zero resources?

[JR77]

I have encountered a province with _zero_ resources. Unfortunately, I found out after building a lab to recruit a nice indy mage. There is zero unrest, so that is not the reason, but I am not able to recruit anybody - not even a 1 resource mage

Is this a bug or can this happen by chance (I have not seen it in any game before) and are there any sites (like mines) which requires e.g. earth search and could increase the resource above zero? There are some mines in other provinces, but they did not require me to search for them and they were (as this one) next to a prefixed starting position on the map.

I would appreciate any input, but think I just might have wasted the money on the lab (and the first mage, who will forever be queued)...