I am trying to place an industrial zone when some tiles show "+1 production from the adjacent strategic resource". I do not see any strategic resources in that area, and my scientific progress has only gone so far as niter.
The tiles with and without the bonus seem to point to a tile with a completed commercial hub already on it. Does this mean this commercial hub is sitting on a later-era strategic resource? So does it mean we can use industrial zones to prospect for future strategic resources? I thought districts would remove resources. Is that not so? If this is indeed a hidden resource, am I correct in thinking the adjacency bonus will stay despite the tile being appropriated already.