There's a type in the improvement's sql script. You are inserting "IMPROVEMENT_MC_PA" into Improvement_ResourceTypes instead of "IMPROVEMENT_MC_NGAI_TAHU_PA", so it doesn't work to put the Pa on a bonus resource. Quick fix though :)

Pounamu doesn't show as a resource. It cannot be traded or shipped to other cities. Please, explain what to do.

MC, as always, putting out historical epics for the world to play virtually in the modern age, doing the Almighty Diety's work